Engine Controls and Fuel - 1.4l (Luj Luv) - DTC p0010 to DTC p0326 Buick Encore I

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The camshaft position actuator system enables the Engine Control Module (ECM) to change the timing of the camshafts while the engine is operating. The Camshaft Position Actuator Solenoid Valve signal from the ECM is pulse width modulated (PWM). The ECM controls the Camshaft Position Actuator Solenoid Valve duty cycle by controlling the amount of solenoid valve On time. The Camshaft Position Actuator Solenoid Valve controls the advance or the retard of each camshaft. The Camshaft Position Actuator Solenoid Valve controls the oil flow that applies the pressure to advance or retard the camshafts.

The ECM controls the Camshaft Position Actuator Solenoid Valve by suppling a 12 V pulse width modulated (PWM) signal. The ECM supplies a ground to the low reference circuit.

Conditions for Running the DTC

1. The ignition voltage is greater than 11 V
2. The ignition switch is in the crank or run position.
3. The ECM has commanded the Camshaft Position Actuator Solenoid Valve On.
4. The DTCs run continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0010, P0013, P2088, P2089, P2090 and P2091 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0010, P0013, P2088, P2089, P2090 and P2091 are type B DTCs.

Diagnostic Aids

If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Circuit Test Status parameters for the component. The Circuit Test Status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.

Reference Information

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Component View Reference

Powertrain Component Views

Description and Operation

Camshaft Actuator System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition On.
2. Verify DTC P0335, P0336, P0340, or P0341 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
3. Engine idling, command the Camshaft Position Actuator to 10° while observing the following control circuit status parameters with a scan tool: Exhaust or Intake Camshaft Position Actuator Solenoid Valve Control Circuit Open Test Status Exhaust or Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Intake or Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing If Malfunction is not displayed
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
6. All OK.

Circuit/System Testing

1. Ignition Off and all vehicle systems Off, disconnect the appropriate harness connector at the camshaft position actuator solenoid valve. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 1 and ground. If 5 ohms or greater Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
3. Test for less than 5 ohms between the control circuit terminal 2 and ground. If 5 ohms or greater Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
4. Ignition On.
5. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground. If the test lamp illuminates Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit If less than 1 V, replace the K20 Engine Control Module If the test lamp does not illuminate
6. Remove the test lamp.
7. Connect the DMM black lead to the control circuit terminal 2. Connect the DMM red lead to B+. Set the DMM on the diode setting. Command the CMP actuator solenoid On and Off with a scan tool. The DMM should transition from OL when commanded Off to less than 1 V when commanded On. If the circuit voltage does not correspond to the specified values Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance or short to ground in the circuit If less than 2 ohms, replace the K20 Engine Control Module If the circuit voltage corresponds to the specified values
8. Test or replace the appropriate camshaft position actuator solenoid valve.

Component Testing

1. Ignition Off, disconnect the harness connector at the appropriate Q6 Camshaft Position Actuator Solenoid Valve.
2. Test for 7-12 ohms between the control terminal 2 and the low reference circuit terminal 1. If not between 7-12 ohms Replace the Q6 Camshaft Position Actuator Solenoid Valve. If between 7-12 ohms
3. Test for infinite resistance between each terminal and the Q6 Camshaft Position Actuator Solenoid Valve housing. If less than infinite resistance Replace the Q6 Camshaft Position Actuator Solenoid Valve. If infinite resistance
4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Camshaft Position Actuator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The camshaft position (CMP) actuator system enables the engine control module (ECM) to change the timing of the camshafts while the engine is operating. The camshaft position actuator solenoid valves are operated hydraulically in order to change the angle of the camshaft relative to crankshaft position. The camshaft position actuator solenoid valves are controlled by the engine control module (ECM). The ECM sends a pulse width modulated signal to the camshaft position actuator solenoid valves. The camshaft position actuator solenoid valves control the amount of engine oil flow that applies the pressure to advance or retard the camshafts.

1. DTC P0010, P0013, P0016, P0017, P0335, P0340, P0341, P0365, or P0366 is not set.
2. The engine is running.
3. The ignition voltage is between 11-32 V.
4. The camshaft position actuator is enabled.
5. The rate of change in the camshaft position is less than 3° for 4 s.
6. DTCs P0011 and P0014 runs continuously once the above conditions are met for greater than 0.1 s.

The ECM detects a difference between the camshaft position angle and the desired camshaft position angle is greater than 6 to 10° based on engine coolant temperature and engine speed.

DTCs P0011 and P0014 are Type B DTCs.

DTCs P0011 and P0014 are Type B DTCs.

1. The engine oil condition has a major impact on the camshaft actuator system.
2. A low oil level condition may set this DTC. The engine may require an oil change. Inquire with the customer when the last oil change was performed. You may also monitor the scan tool Engine Oil Life Remaining parameter. Advise the customer an oil change may be required.
3. Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, camshaft actuator, or timing belt can cause this DTC to set.
4. A resistance greater than 8 ohms on the camshaft position actuator solenoid valve control circuit may set this DTC. If you suspect high resistance, ground the control circuit while the engine is idling. The scan tool Intake or Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status should display Malfunction. If the parameter displays OK, test the control circuit for high resistance.

Schematic Reference

ENGINE CONTROLS SCHEMATICS (Encore) ENGINE CONTROLS SCHEMATICS (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Component View Reference

Powertrain Component Views

Description and Operation

Camshaft Actuator System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition On.
2. Verify the correct engine oil level and pressure. Refer to «OIL PRESSURE DIAGNOSIS AND TESTING»(ref-614552-S04203192842014050700000) If the oil level and the oil pressure are not correct Repair as necessary If the oil level and the oil pressure are correct
3. Verify DTC P0010, P0013, P0016, P0017, P0335, P0336, P0340, P0341, P0365, P0366, P2088, P2089, P2090 or P2091 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If none of the DTCs are set
4. Engine idling.
5. Verify the scan tool parameters are less than 2° in each of the commanded states when commanding the Camshaft Position Actuator from 0-20° and back to 0° with the scan tool. Intake Camshaft Position Variance Exhaust Camshaft Position Variance Intake Camshaft Position Variance Exhaust Camshaft Position Variance If 2° or greater Refer to Circuit/System Testing. If less than 2°
6. Verify that DTC P0011 or P0014 is not set. If any of the DTCs are set Refer to Circuit/System Testing. If none of the DTCs set
7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
8. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
9. All OK.

1. Ignition Off, disconnect the harness connector at the appropriate Q6 Camshaft Position Actuator Solenoid Valve. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 1 and ground. If 5 ohms or greater Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
3. Ignition On.
4. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground. If the test lamp illuminates Ignition Off, disconnect the harness connector at the K20 Engine Control Module, ignition On. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If the test lamp does not illuminate
5. Remove the test lamp.
6. Verify the scan tool parameters listed below do not display Malfunction when commanding the appropriate Camshaft Position Actuator Solenoid Valve On with a scan tool. Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Ignition Off, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance or short to ground in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is not displayed
7. Ignition Off, remove the Q6 Camshaft Position Actuator Solenoid Valve.
8. Verify the conditions listed below do not exist with the Q6 Camshaft Position Actuator Solenoid Valve: Torn, restricted, mis-positioned, or missing screens. Engine oil leak between the oil sealing lands of the solenoid. Inspect the lands of the solenoid for nicks. Oil seepage at the solenoid connector. If a condition is found Replace the Q6 Camshaft Position Actuator Solenoid Valve. If a condition is not found
9. Ignition Off, swap the Q6 Camshaft Position Actuator Solenoid Valve with the Q6 Camshaft Position Actuator Solenoid Valve that is operating correctly.
10. Engine idling.
11. Verify the scan tool Camshaft Position Variance parameter is less than 2° in each of the commanded states when commanding the Camshaft Position Actuator from 0-20° and back to 0° with a scan tool. If 2° or greater Replace the mechanical camshaft position actuator. If less than 2°
12. Test or replace the Q6 Camshaft Position Actuator Solenoid Valve.

1. Ignition Off, disconnect the harness connector at the appropriate Q6 Camshaft Position Actuator Solenoid Valve.
2. Test for 7-12 ohms between the control terminal 2 and the low reference circuit terminal 1. If not between 7-12 ohms Replace the Q6 Camshaft Position Actuator Solenoid Valve. If between 7-12 ohms
3. Test for infinite resistance between each terminal and the Q6 Camshaft Position Actuator Solenoid Valve housing. If less than infinite resistance Replace the Q6 Camshaft Position Actuator Solenoid Valve. If infinite resistance
4. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Camshaft Position Actuator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses the crankshaft position sensor, intake camshaft position sensor, and the exhaust camshaft position sensor information to monitor the correlation between the crankshaft, intake camshaft, and exhaust camshaft position.

1. DTCs P0335, P0336, P0340, P0341, P0365, P0366, P0641, or P0651 is not set
2. The engine is running.
3. The camshaft position actuator solenoid valves are in the parked position.

The DTCs run continuously once the above conditions are met.

The ECM detects a camshaft to crankshaft misalignment. The DTC sets if the crankshaft position sensor signal is 10 degrees before or after the normal position in relation to the crankshaft angle while the engine is running.

DTCs P0016 and P0017 are Type B DTCs.

DTCs P0016 and P0017 are Type B DTCs.

The following conditions can also set the DTCs

1. A short to ground in a camshaft position actuator solenoid valve control circuit.
2. Crankshaft end play out of specification.
3. A crankshaft reluctor wheel that has moved in relationship to top dead center (TDC).

Description and Operation

Camshaft Actuator System Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify DTC P0335, P0336, P0340, P0341, P0365, P0366, P0641 or P0651 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
3. Engine Running at normal operating temperature.
4. Verify DTC P0016 or P0017 is not set. If the DTC is set Inspect for the following and repair as necessary: A Q6 Camshaft Position Actuator Solenoid Valve that is stuck in the full advance or retard position. The correct installation of the Q6 Camshaft Position Actuator Solenoid Valves. The correct installation of the B23 Camshaft Position Sensors. The correct installation of the B26 Crankshaft Position Sensor. A timing chain tensioner condition. An incorrectly installed timing chain. Excessive play in the timing chain. A crankshaft reluctor wheel that has moved in relationship to top dead center (TDC) on the crankshaft. If the DTC is not set
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
6. Verify the DTC does not set. If the DTC sets A mechanical condition listed above still exists. If the DTC does not set
7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Camshaft Position Actuator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Camshaft Position Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
3. «Crankshaft Position Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
4. «Timing Chain Tensioner Replacement»(ref-614552-S18951634822014050700000)

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Typical Scan Tool Data

HO2S Sensor 1 Current/HO2S Sensor 2 Current

Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. Each HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside each of the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse-width modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.

P0030, P0031, P0032, P0036, P0037 and P0038

1. The system voltage is between 11-32 V.
2. The engine speed is greater than 400 RPM.
3. The DTCs run continuously when the above conditions are met for greater than 5 s.

P0053 and P0054

1. DTCs P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119 or P2610 are not set.
2. The system voltage is less than 32 V.
3. The ignition is OFF for greater than 8 h.
4. The engine is running.
5. The ECT is between -30 to +45°C (-22 to +113°F).
6. The engine coolant temperature (ECT) and the intake air temperature (IAT) are within 8°C (14°F).
7. The DTCs run once per valid cold start-up when the above conditions are met.

P0135 and P0141

1. DTCs P0116, P0117, P0118, P0119 or P0128 are not set.
2. The system voltage is between 10-32 V.
3. The HO2S heaters are at operating temperature.
4. The scan tool HO2S Heater device control is not active.
5. The commanded HO2S heater duty cycle is greater than 0%.
6. The DTCs run twice per drive cycle when the above conditions are met for greater than 30 s.

P0030, P0031, P0032, P0036, P0037 and P0038

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

P0053 and P0054

The ECM detects the HO2S heater is not within 7.5-13 ohms at engine start-up.

P0135 and P0141

The ECM detects the HO2S heater current is less than 0.30 A or greater than 2.5 A for greater than 8 s.

DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.

DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.

1. If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status parameters for the component. The circuit status parameters will change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.
2. An open fuse in the HO2S heater circuit may be caused by the heater element in one of the sensors. The condition may not be present until the sensor operates for a period of time. If no fault is present in the heater circuit, monitor the amperage of each heater with a scan tool to determine if one of the heater elements is the cause of the open fuse. Inspect the sensor pigtail or the harness for contacting the exhaust system.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Engine idling.
2. Verify the parameters listed below do not display Malfunction. HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status HO2S 1 or 2 Heater Control Circuit Open Test Status HO2S 1 or 2 Heater Control Circuit High Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
3. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
5. All OK.

1. Ignition OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor. Ignition ON.
2. Verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test all components connected to the fuse and replace as necessary. If the test lamp illuminates
3. Verify that a test lamp does not illuminate between the ignition voltage circuit terminal 1 and the control circuit terminal 2. If the test lamp illuminates Ignition OFF, remove the test lamp, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp does not illuminate
4. Remove the test lamp.
5. Verify the scan tool HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter is OK when commanding the HO2S Heater Sensor 1 or 2 ON with a scan tool. If OK is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
6. Install a 10 A fused jumper wire between the control circuit terminal 2 and the ignition voltage circuit terminal 1.
7. Verify the scan tool HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter is Malfunction when commanding the HO2S Heater Sensor 1 or 2 ON with a scan tool. If Malfunction is not displayed Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
8. Test or replace the B52 Heated Oxygen Sensor.

1. Ignition OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor.
2. Test for 8-20 ohms between the ignition voltage circuit terminal 1 and the control circuit terminal 2. If not within the specified range Replace the B52 Heated Oxygen Sensor. If within the specified range
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The turbocharger incorporates a wastegate that is controlled by a pressure differential, that is determined by the engine control module (ECM) by means of a PWM solenoid valve, in order to regulate the pressure ratio of the turbocharger. A turbocharger bypass valve also controlled by the ECM by utilizing a remotely mounted solenoid valve is integrated into the bypass valve to prevent turbocharger surging and damage from vibrations by opening during abrupt closed throttle conditions. When the valve is open during closed throttle deceleration conditions, the bypass valve allows the air to recirculate in the turbocharger and maintain turbocharger speed. Within a calibrated range during the closed throttle event, or upon a wide open throttle command the valve will then close to optimize turbo response. The bypass solenoid valve has the following circuits

1. Ignition voltage
2. Turbocharger bypass solenoid valve control

As engine load and engine speed increases, the turbocharger bypass solenoid valve remains commanded ON by the ECM. As soon as the throttle closes the turbocharger bypass solenoid valve is commanded OFF by the ECM, in order to allow the turbocharger bypass valve to open and allow the turbocharger air to recirculate, there by preventing turbocharger surging.

1. The engine is not cranking.
2. The powertrain relay voltage is greater than 11 V.
3. The run/crank voltage is greater than 6 V.
4. The DTC run continuously when the above conditions are met.

The ECM detects an open, a short to ground, or a short to voltage on the turbocharger bypass solenoid valve control circuit for greater than 1 s.

DTC P0033, P0034, P0035 are Type B DTCs.

DTC P0033, P0034, P0035 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve ON and OFF with a scan tool: Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
3. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing If a DTC does not set
4. All OK

1. Ignition OFF, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve. Ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. NOTE: An internal short in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test all components connected to the ignition voltage circuit for a short and replace as necessary. If the test lamp illuminates
3. Verify that a test lamp does not illuminate between the control circuit terminal 1 and the ignition circuit terminal 2. If the test lamp illuminates Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Remove the test lamp. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp does not illuminate
4. Remove the test lamp.
5. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is OK when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool. If OK is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
6. Install a 3 A fused jumper wire between the control circuit terminal 1 and the ignition circuit terminal 2.
7. Verify the scan tool Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction when commanding the Turbocharger Bypass Solenoid Valve Active with a scan tool. If Malfunction is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
8. Test or replace the Q40 Turbocharger Bypass Solenoid Valve.

Static Test

1. Ignition OFF, disconnect the harness connector at the Q40 Turbocharger Bypass Solenoid Valve.
2. Test for 20-27 ohms between terminal 1 and terminal 2 of the solenoid valve. If not between 20-27 ohms Replace the Q40 Turbocharger Bypass Solenoid Valve. If between 20-27 ohms
3. All OK

Dynamic Test

1. Install a 10 A fused jumper wire between the Ignition terminal 2 and 12 V. Install a jumper wire between the control terminal 1 and ground.
2. Verify the solenoid clicks. If the solenoid does not click Replace the Q40 Turbocharger Bypass Solenoid Valve. If the solenoid clicks
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Charge Air Bypass Regulator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) compares actual airflow based on throttle position (TP) to a calculated airflow based on manifold absolute pressure (MAP) sensor, and mass air flow (MAF).

DTC P0068

1. The engine speed is at least 800 RPM.
2. The ignition voltage is at least 6.4 V.
3. The DTC runs continuously when the above conditions are met.

DTC P1101

1. DTC P0102, P0103, P0107, P0111, P0112, P0113, P0116, P0117, P0118, P0335,or P0336 is not set
2. The engine speed is between 400-7,000 RPM
3. The engine coolant temperature (ECT) is between -7 to +125°C (+19 to +257°F).
4. The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
5. The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTCs

The ECM detects that the actual airflow rate is greater than the calculated airflow.

Action Taken When the DTCs Set

1. DTC P0068 is a type A DTC.
2. DTC P0068 is a type B DTC; with RPO LDD.
3. DTC P1101 is a type B DTC.

Conditions for Clearing the DTCs

1. DTC P0068 is a type A DTC.
2. DTC P0068 is a type B DTC; with RPO LDD.
3. DTC P1101 is a type B DTC.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Ignition ON.
4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %. If 90 % or greater Refer to «Throttle Body Inspection and Cleaning»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__throttle-body-inspection-and-cleaning) . If less than 90 %
5. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, or P2135»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If Agree
6. Determine the current vehicle testing altitude.
7. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the MAP Sensor parameter is within range
8. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger Refer to Step 11. If equipped with a turbocharger
9. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. If the Boost Pressure Sensor parameter is not in range Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the Boost Pressure Sensor parameter is within range
10. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine. If the Boost Pressure Sensor parameter does not decrease Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the Boost Pressure Sensor parameter is within range
11. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 PSI) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 PSI) or does not change Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If between 26-52 kPa (3.8-7.5 PSI) and changes
12. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the MAF Sensor parameter changes smoothly and gradually
13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
14. Verify the DTC does not set. If the DTC does set Refer to Circuit/System Testing for further diagnosis. If the DTC does not set
15. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Verify the integrity of the entire air induction system by verifying that none of the following conditions exist: Any damaged components Improper operation of turbocharger wastegate actuator or bypass valve; where equipped Improperly installed components Collapsed, restricted, or damaged components Loose clamps, cracks, or other damage An air flow restriction Restricted air filter Splits, kinks, leaks, or improper connections at the vacuum hoses Vacuum leaks at the intake manifold, MAP sensor, and throttle body Water intrusion Any snow or ice buildup, in cold climates Contamination of the MAF sensor element Missing, restricted, or leaking exhaust components-Refer to «Symptoms - Engine Exhaust»(/buick/encore/i-2012-2016/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) for further diagnosis. If a condition is found Repair or replace component as appropriate. If no condition is found
2. Test the engine for a mechanical condition. Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) for diagnosis. If a condition is found Repair or replace component as appropriate. If no condition is found
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for engine control module replacement, programming, and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

IAT Sensor 1

IAT Sensor 2

IAT Sensor 1

IAT Sensor 2

The sensors listed below are integrated within the multifunction intake air sensor

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. MAF sensor
5. BARO pressure sensor

The intake air temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the engine control module (ECM) supplied 5 V signal circuit. The signal varies with inlet air temperature in the sensor bore and is displayed by the scan tool as °C (°F). The IAT sensor 2 and the humidity sensor share the same circuit. The IAT sensor 2 signal is displayed by the scan tool as Hz (Hertz) and °C (°F).

The IAT sensor 1 produces an analog signal on pin-8 of the sensor. The IAT sensor 2 produces a frequency modulated signal on pin-1 of the sensor.

The sensors listed below share an ECM supplied 5 V reference circuit

1. IAT sensor 2
2. Humidity sensor
3. Barometric pressure (BARO) sensor

The sensors listed below share an ECM supplied low reference circuit

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Barometric pressure (BARO) sensor

IAT Sensor 1 - Temperature, Resistance, Voltage Table

IAT Sensor 2 - Temperature, Frequency Table

Conditions for Running the DTCs

P0096 and P0111

1. DTCs P0097, P0098, P0111, P0112, P0113, P0117, P0118, P00EA, P00EB, or P1682 are not set.
2. The ignition has been OFF at least 8 hours.
3. Ignition voltage is at least 11 V.
4. These DTCs run once per ignition cycle when the enabling conditions are met.

P0096

1. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (45°F). AND
2. The ECM determines the absolute difference between IAT sensor 2 start-up temperature and the IAT sensor 3 start-up temperature is greater than 25°C (45°F). AND
3. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 3 start-up temperature is less than or equal to 25°C (45°F).
4. This DTC runs once per ignition cycle when the enabling conditions are met.

Note. P0111 Can fail under any of the following 3 sets of conditions.

P0111 - Condition 1

1. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (45°F). AND
2. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 3 start-up temperature is greater than 25°C (45°F). AND
3. The ECM determines the absolute difference between IAT sensor 2 start-up temperature and the IAT sensor 3 start-up temperature is less than or equal to 25°C (45°F).

P0111 - Condition 2

1. The ECM determines the IAT sensor 2 start-up temperature is between the IAT sensor 1 and IAT sensor 3 start-up temperatures. AND
2. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 3 start-up temperature is greater than 25°C (45°F). AND
3. The ECM determines the absolute difference between IAT sensor 2 and the IAT sensor 1 start-up temperatures is greater than absolute difference between IAT sensor 2 and the IAT sensor 3 start-up temperatures.

P0111 - Condition 3

1. The ECM determines the IAT sensor 3 start-up temperature is between the IAT sensor 1 and IAT sensor 2 start-up temperatures. AND
2. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (45°F). AND
3. The ECM determines the absolute difference between IAT sensor 3 and the IAT sensor 1 start-up temperatures is greater than absolute difference between IAT sensor 3 and the IAT sensor 2 start-up temperatures.

DTC P0111 runs once an ignition cycle when the any one, of the above 3 enabling sets of conditions is met.

DTCs P0096 and P0111 are Type B DTCs.

DTCs P0096 and P0111 are Type B DTCs.

1. With the ignition ON, when the engine is OFF and is cold; properly functioning IAT sensors 1 and 2 will gradually increase the scan tool IAT Sensor 1 and 2 parameters. This is due to the heat that is generated by the multifunction intake air sensor internal heating elements.
2. The Humidity sensor and the IAT sensor 2 signals are sent to the ECM on the same circuit. If the IAT Sensor 2 parameter displays the values: 10 Hz; -40°C (-40°F), and there are also Humidity Sensor DTCs, check for a circuit problem.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522-A Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Ignition ON.
4. Verify the following scan tool parameters are within 25°C (45°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not within 25°C (45°F) Refer to Circuit/System Testing. If within 25°C (45°F)
5. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit System Testing. If between: -38 and +149°C (-36 and +300°F)
6. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
8. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Check the integrity of the entire air induction system and verify that none of the following conditions exist: A loose or disconnected charge air cooler hose or pipe; where equipped A blocked or obstructed charge air cooler, including: after-market grill covers; where equipped Any snow or ice build-up at the charge air cooler in cold climates; where equipped Any mud or dirt build-up at the charge air cooler; where equipped A restricted or collapsed air intake duct An intake manifold leak A MAP sensor seal that is leaking, missing, or damaged A misaligned or damaged air intake duct Any water intrusion in the induction system An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing If a condition exists Repair or replace component as appropriate. If no condition exists
2. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B75C Multifunction Intake Air sensor.
3. Test for less than 2 ohms between the low reference circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the 5 V reference circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 8 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
6. Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than -39°C (-38°F). If warmer than -39°C (-38°F). Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 8 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If colder than -39°C (-38°F).
7. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 8 and the low reference circuit terminal 7.
8. Verify the scan tool IAT Sensor 3 parameter is warmer than 150°C (302°F). If colder than 150°C (302°F). Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If warmer than 150°C (302°F).
9. Ignition ON, test for 4.8-5.2 V between the signal terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
10. Determine if EL-38522-A Variable Signal Generator or equivalent is available. EL-38522-A, Variable Signal Generator; or equivalent is not available Replace the K20 Engine Control Module. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data. Verify the DTC does not set. If the DTC sets Test or replace the B75C Multifunction Intake Air sensor. If no DTCs set Circuits, ECM, and the sensors test OK, refer to step 18. EL-38522-A, Variable Signal Generator; or equivalent is available
11. Ignition OFF, connect the leads of the EL-38522-A Variable Signal Generator as follows: Red lead to the signal circuit terminal 1 at the harness connector Black leads to ground Battery voltage supply lead to B+
12. Set the EL-38522-A Variable Signal Generator to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
13. Ignition ON, verify the scan tool IAT Sensor 2 parameter is between 28-32 Hz. If not between 28-32 Hz Replace the K20 Engine Control Module. If between 28-32 Hz
14. Ignition OFF and all vehicle systems OFF, disconnect the B111B Turbocharger Boost/Intake Air Temperature sensor. It may take up to 2 min for all vehicle systems to power down.
15. Test for less than 2 ohms between the low reference circuit terminal 1 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
16. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
17. Test or replace the appropriate temperature sensor.
18. All OK.

Multifunction Intake Air Sensor

1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
2. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Bosch Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) table for Bosch Sensors. The resistance values should be in range of the table values. If not within the specified range. Replace the B75C Multifunction Intake Air sensor. If within the specified range. All OK

Multifunction Intake Air Sensor

1. Test the IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%. If not within 5% Replace the B75C Multifunction Intake Air sensor. If within 5%
2. All OK.

Turbocharger Boost/Intake Air Temperature sensor

1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
2. Test the IAT sensor 3 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Bosch Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) table for the appropriate sensor. The resistance values should be in range of the table values. If not within the specified range. Replace the B111B Turbocharger Boost/Intake Air Temperature sensor. If within the specified range.
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Intake Air Pressure and Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement
2. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement
3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

IAT Sensor 2

IAT Sensor 2

The sensors listed below are integrated within the multifunction intake air sensor

1. Intake Air Temperature (IAT) sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Mass Air Flow (MAF) sensor
5. Barometric (BARO) pressure sensor

The IAT sensor 2 and the humidity sensor share the same circuit. The IAT sensor 2 signal is displayed by the scan tool as Hertz (Hz) and °C (°F).

The sensors listed below share an ECM supplied 5 V reference circuit

1. IAT sensor 2
2. Humidity sensor
3. Barometric pressure (BARO) sensor

The sensors listed below share an ECM supplied low reference circuit

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Barometric pressure (BARO) sensor

IAT Sensor 2 - Temperature, Frequency Table

P0097, P0098, and P0099

1. The ignition is ON, or the engine is running.
2. The Ignition voltage is at least 11 V.
3. The DTCs run continuously within the enabling conditions.

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

P0097

The ECM detects that the IAT sensor 2 signal is less than 10 Hz, colder than -60°C (-76°F), for greater than 5 s.

P0098

The ECM detects that the IAT sensor 2 signal is greater than 390 Hz, warmer than 150°C (302°F), for greater than 5 s.

P0099

The ECM detects that the IAT sensor 2 signal is intermittent or has abruptly changed for longer than 5 s.

1. DTCs P0097, P0098, and P0099 are Type B DTCs.
2. The ECM commands the cooling fans ON.

Conditions for Clearing the MIL/DTCs

DTCs P0097, P0098, and P0099 are Type B DTCs.

1. With the ignition ON, when the engine is cold and not running, properly functioning IAT sensor 2 will gradually increase the scan tool IAT Sensor 2 parameters. This is due to the heat that is generated by the multifunction intake air sensor heating elements.
2. The humidity sensor and the IAT sensor 2 signals are sent to the ECM on the same circuit. If the IAT Sensor 2 parameter displays the values: 10 Hz; -40°C (-40°F), and there are also Humidity Sensor DTCs, check for a circuit problem.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

EL-38522-A Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Ignition ON.
4. Verify the following scan tool parameters are within 25°C (45°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not within 25°C (45°F) Refer to Circuit/System Testing. If within 25°C (45°F)
5. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit System Testing. If between: -38 and +149°C (-36 and +300°F)
6. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
8. All OK

1. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B75C Multifunction Intake Air sensor.
2. Test for less than 2 ohms between the low reference circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the 5 V reference circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
5. Determine if EL-38522-A Variable Signal Generator or equivalent is available. EL-38522-A, Variable Signal Generator; or equivalent is not available Replace the K20 Engine Control Module. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data. Verify the DTC does not set. If the DTC sets Refer to step 9. If the DTC does not set All OK. EL-38522-A, Variable Signal Generator; or equivalent is available
6. Ignition OFF, connect the leads of the EL-38522-A Variable Signal Generator as follows: Red lead to the signal circuit terminal 1 at the harness connector Black leads to ground Battery voltage supply lead to B+
7. Set the EL-38522-A Variable Signal Generator to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
8. Ignition ON, verify the scan tool IAT Sensor 2 parameter is between 28-32 Hz. If not between 28-32 Hz Replace the K20 Engine Control Module. If between 28-32 Hz
9. Test or replace the B75C Multifunction Intake Air sensor.

Multifunction Intake Air Sensor

1. Test the IAT Sensor 2 by varying the sensor temperature while monitoring the air temperature with a thermometer. Compare the readings with the scan tool IAT Sensor 2 parameter. The values should be within 5%. If not within 5% Replace the B75C Multifunction Intake Air sensor. If within 5%
2. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement.
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The Intake Air Pressure Measurement System consists of 3 sensors

1. The barometric pressure (BARO) is measured by the B75C Multifunction Intake Air Sensor
2. The manifold absolute pressure (MAP) is measured by the B74 Manifold Absolute Pressure Sensor
3. The boost pressure is measured by the B111B Turbocharger Boost/Intake Air Temperature Sensor

1. DTCs P0106, P0107, P0108, P2122, P2123, P2127, P2128, P2138 or P2610 are not set.
2. The engine is running.
3. Time between current ignition cycle and the last time the engine was running is greater than 10 s.
4. Manifold pressure between 50 and 115 kPa (7.25 and 16.68 PSI).
5. BARO pressure between 50 and 115 kPa (7.25 and 16.68 PSI).
6. Turbocharger boost pressure between 50 and 115 kPa (7.25 and 16.68 PSI).
7. This DTC runs continuously within the enabling conditions.

The ECM detects an inconsistency between pressure sensors in the induction system in which a particular sensor cannot be identified as the failed sensor. The difference is greater than 10 kPa (1.5 PSI).

DTC P00C7 is a Type B DTC.

DTC P00C7 is a Type B DTC.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that DTCs P0106, P0107, P0236, P0237, P0238, P2227, P2228, P2229, or P2230, are not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If none of the DTCs is set
3. Verify none of the following conditions exist: The air intake duct system for loose connecting clamps, cracks, or other damage A damaged Q38 Throttle Body blade or shaft Splits, kinks, or improper connections at the vacuum hoses Faulty positive crankcase ventilation system operation Carbon deposits on the throttle blade. Vacuum leaks at the intake manifold, Q38 Throttle Body, Q17 Fuel Injector O-rings, and B111 Intake Manifold Pressure and Air Temperature Sensor. If a condition exist Repair as necessary.
4. Ignition ON.
5. Verify the following scan tool parameters are within range of the Altitude vs. Barometric Pressure table. Refer to: «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. BARO Sensor MAP Sensor Turbocharger Boost Sensor If a sensor parameter is not within range Refer to the appropriate diagnostic below for further diagnosis. Barometric Pressure (BARO) Sensor. Refer to: «DTC P2227-P2230»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) Manifold Absolute Pressure (MAP) Sensor. Refer to: «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) Turbocharger Boost Pressure Sensor. Refer to: «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) If all sensor parameters are within range
6. All OK

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Engine Control Module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

IAT Sensor 3

IAT Sensor 3

The intake air temperature (IAT) sensor 3 is a variable resistor that changes an engine control module (ECM) supplied 5 V signal. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The IAT sensor 3 is integrated with the B111B Turbocharger Boost/Intake Air Temperature Sensor in the sensor bore, which is located before the throttle body. The ECM supplies a ground for the IAT sensor 3 low reference circuit.

The IAT sensor 1 and IAT sensor 2 are part of the B75C Multifunction Intake Air Sensor. The IAT sensor 1 produces an analog signal on pin-8 of the sensor. The IAT sensor 2 produces a frequency modulated signal on pin-1 of the sensor.

IAT Sensor 3 - Temperature, Resistance, Voltage Table

P00E9

1. DTCs P0097, P0098, P00EA, P00EB, P0111, P0112, P0113, P0117, P0118, or P1682 are not set.
2. The vehicle has been OFF at least 8 hours.
3. Ignition voltage is at least 11 V.
4. This DTC runs once per ignition cycle when the enabling conditions are met.

Note. P00E9 Can fail under any of the following 3 sets of conditions.

P00E9-Condition 1

1. The ECM determines the absolute difference between IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is less or equal to 25°C (45°F). AND
2. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 1 start-up temperature is greater than 25°C (45°F). AND
3. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (45°F).

P00E9-Condition 2

1. The ECM determines the IAT sensor 1 start-up temperature is between the IAT sensor 3 and the IAT sensor 2 start-up temperatures AND
2. The ECM determines the absolute difference between IAT sensor 3 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (45°F). AND
3. The ECM determines the absolute difference between IAT sensor 3 and the IAT sensor 1 start-up temperatures is greater than the absolute difference between IAT sensor 2 and the IAT sensor 1 start-up temperatures.

P00E9-Condition 3

1. The ECM determines the IAT sensor 2 start-up temperature is between the IAT sensor 3 and the IAT sensor 1 start-up temperatures AND
2. The ECM determines the absolute difference between IAT sensor 3 and the IAT sensor 1 start-up temperatures is greater than 25°C (45°F). AND
3. The absolute difference between IAT sensor 3 and the IAT sensor 2 start-up temperatures is greater than the absolute difference between IAT sensor 2 and the IAT sensor 1 start-up temperatures.

DTC P00E9 runs once an ignition cycle when one of the above 3 enabling sets of conditions are met.

1. DTC P00E9 is Type C DTC, MY14 and newer vehicles.
2. DTC P00E9 is Type B DTC, MY13 and older vehicles.

1. DTC P00E9 is Type C DTC, MY14 and newer vehicles.
2. DTC P00E9 is Type B DTC, MY13 and older vehicles.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522-A Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Ignition ON.
4. Verify the following scan tool parameters are within 25°C (45°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3 If not within 25°C (45°F) Refer to Circuit/System Testing. If within 25°C (45°F)
5. Engine idling, verify the IAT Sensor 3 scan tool parameter is between: -38 and +128°C (-36 and +262°F). If not between: -38 and +128°C (-36 and +262°F) Refer to Circuit System Testing. If between: -38 and +128°C (-36 and +262°F)
6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
8. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Check the integrity of the entire air induction system and verify that none of the following conditions exist: A loose or disconnected charge air cooler hose or pipe A blocked or obstructed charge air cooler, including: after-market grill covers Any snow or ice build-up at the charge air cooler in cold climates Any mud or dirt build-up at the charge air cooler A restricted or collapsed air intake duct An intake manifold leak A MAP sensor seal that is leaking, missing, or damaged A misaligned or damaged air intake duct Any water intrusion in the induction system An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing If a condition exists Repair or replace component as appropriate. If no condition exists
2. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
3. Test for less than 2 ohms between the low reference circuit terminal 1 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
5. Ignition ON, verify the scan tool IAT Sensor 3 parameter is colder than -39°C (-38°F). If warmer than -39°C (-38°F). Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If colder than -39°C (-38°F).
6. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
7. Verify the scan tool IAT Sensor 3 parameter is warmer than 128°C (262°F). If colder than 128°C (262°F). Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 ECM, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 ECM. If warmer than 128°C (262°F).
8. Test or replace the B111B Turbocharger Boost/Intake Air Temperature sensor.

Turbocharger Boost/Intake Air Temperature sensor

1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
2. Test the IAT sensor 3 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Bosch Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) table for the appropriate sensor. The resistance values should be in range of the table values. If not within the specified range. Replace the B111B Turbocharger Boost/Intake Air Temperature sensor. If within the specified range.
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Intake Air Pressure and Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement
2. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement
3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

IAT Sensor 3

IAT Sensor 3

The intake air temperature (IAT) sensor 3 is a variable resistor that changes an engine control module (ECM) supplied 5 V signal. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The IAT sensor 3 is integrated with the B111B Turbocharger Boost/Intake Air Temperature Sensor in the sensor bore, which is located before the throttle body. The ECM supplies a ground for the IAT sensor 3 low reference circuit.

The IAT sensor 1 and IAT sensor 2 are part of the B75C Multifunction Intake Air Sensor. The IAT sensor 1 produces an analog signal on pin-8 of the sensor. The IAT sensor 2 produces a frequency modulated signal on pin-1 of the sensor.

P00EA, P00EB, and P00EC

1. The ignition is ON, or the engine is running.
2. The DTCs run continuously when the above conditions are met.

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

P00EA

The ECM detects that the IAT sensor 3 signal is warmer than 149°C (300°F) for at least 5 s.

P00EB

The ECM detects that the IAT sensor 3 signal is colder than -60°C (-76°F) for at least 5 s.

P00EC

The ECM detects that the IAT sensor 3 signal is intermittent or has abruptly changed for at least 5s.

1. DTCs P00EA, P00EB, and P00EC are Type B DTCs.
2. The ECM commands the cooling fans ON.

DTCs P00EA, P00EB, and P00EC are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Ignition ON.
4. Verify the following scan tool parameters are within 25°C (45°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3 If not within 25°C (45°F) Refer to Circuit/System Testing. If within 25°C (45°F)
5. Engine idling, verify the IAT Sensor 3 scan tool parameter is between: -38 and +128°C (-36 and +262°F). If not between: -38 and +128°C (-36 and +262°F) Refer to Circuit System Testing. If between: -38 and +128°C (-36 and +262°F)
6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
7. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
8. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
2. Test for less than 2 ohms between the low reference circuit terminal 1 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
4. Ignition ON, verify the scan tool IAT Sensor 3 parameter is colder than -39°C (-38°F). If warmer than -39°C (-38°F). Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If colder than -39°C (-38°F).
5. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
6. Verify the scan tool IAT Sensor 3 parameter is warmer than 128°C (262°F). If colder than 128°C (262°F). Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 ECM, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 ECM. If warmer than 128°C (262°F).
7. Test or replace the B111B Turbocharger Boost/Intake Air Temperature sensor.

Turbocharger Boost/Intake Air Temperature sensor

1. Ignition OFF, disconnect the harness connector at the B111B Turbocharger Boost/Intake Air Temperature sensor.
2. Test the IAT sensor 3 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Bosch Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) table for the appropriate sensor. The resistance values should be in range of the table values. If not within the specified range. Replace the B111B Turbocharger Boost/Intake Air Temperature sensor. If within the specified range.
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Intake Air Pressure and Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for turbocharger boost/intake air temperature replacement
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Intake Air Humidity Sensor

Intake Air Humidity

The sensors listed below are integrated within the multifunction intake air sensor

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. MAF sensor
5. BARO pressure sensor

The intake air humidity sensor measures the ambient humidity of the air in the sensor bore. The signal varies with intake air humidity and is displayed by the scan tool as duty cycle %. The engine control module (ECM) applies 5 V to the signal circuit. The humidity sensor and the IAT sensor 2 share the same circuit.

The sensors listed below share an ECM supplied 5 V reference circuit

1. IAT sensor 2
2. Humidity sensor
3. Barometric pressure (BARO) sensor

The sensors listed below share an ECM supplied low reference circuit

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Barometric pressure (BARO) sensor

P00F4, P00F5, and P00F6

1. DTC P1682 is not set.
2. The ignition is ON.
3. The Ignition voltage is at least 11 V.
4. These DTCs run continuously within the enabling conditions.

P00F4

The ECM detects that the humidity sensor signal is less than or equal to 5 % for greater than 5 s.

P00F5

The ECM detects that the humidity sensor signal is greater than or equal to 95 % for greater than 5 s.

P00F6

The ECM detects that the humidity sensor signal is intermittent or has abruptly changed over a period of time greater than s.

DTCs P00F4,P00F5, and P00F6 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P00F4,P00F5, and P00F6 are Type B DTCs.

1. The Intake Air Humidity Signal parameter displays the measured humidity within the air intake system and may differ from atmospheric humidity measured outside the air intake system.
2. The humidity sensor and the IAT sensor 2 signals are sent to the ECM on the same circuit. If the Intake Air Humidity parameter displays the value: 0 % or 100 %, and there are also IAT Sensor 2 DTCs, check for a circuit problem.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522-A Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON, verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
2. Ignition ON.
3. Verify the following scan tool parameters are within 25°C (45°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not within 25°C (45°F) Refer to Circuit/System Testing. If within 25°C (45°F)
4. Engine idling, verify the scan tool Intake Air Humidity parameter is between 5 and 90 %. If not between 5 and 90 % Refer to Circuit/System Testing. If between 5 and 90 %
5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
7. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B75C Mass Air Flow/Multifunction Intake Air sensor.
2. Test for less than 2 ohms between the low reference circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
3. Ignition OFF, all vehicle systems OFF, test for less than 2 ohms between the ground circuit terminal 4 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 2 ohms
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the 5 V reference circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
5. Ignition ON, test for 4.8-5.2 V between the humidity signal circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
6. Determine if EL-38522-A Variable Signal Generator or equivalent is available. EL-38522-A, Variable Signal Generator; or equivalent is not available Replace the K20 Engine Control Module. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data. Verify the DTC does not set. If the DTC sets Refer to step 10. If the DTC does not set All OK. EL-38522-A, Variable Signal Generator; or equivalent is available
7. Ignition OFF, connect the leads of the EL-38522-A Variable Signal Generator as follows: Red lead to the signal circuit terminal 1 at the harness connector Black leads to ground Battery voltage supply lead to B+
8. Set the EL-38522-A Variable Signal Generator to the following specifications. Signal switch to 5 V Frequency switch to 250 Hz Duty Cycle switch to 50 % (Normal)
9. Ignition ON, verify the scan tool Intake Air Humidity parameter is between 45-55 %. If not between 45-55 % Replace the K20 Engine Control Module. If between 45-55 %
10. Test or replace the B75C Multifunction Intake Air sensor.

Multifunction Intake Air Sensor

1. Test the Intake Air Humidity Sensor by varying the air humidity in the intake duct near the sensor, while observing the scan tool Intake Air Humidity Sensor parameter. The parameter should change and be within 5-95%. If not within 5-95%. Replace the B75C Multifunction Intake Air sensor. If within 5-95%.
2. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement.
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAF Sensor

MAF Sensor

Circuit Description

The sensors listed below are integrated within the multifunction intake air sensor

1. Intake Air Temperature (IAT) sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Mass Air Flow (MAF) sensor
5. Barometric (BARO) pressure sensor

The MAF sensor is an air flow meter that measures the amount of air flowing in the sensor bore. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition.

The ECM applies 5 V to the MAF sensor signal circuit. The sensor produces a variable frequency signal based on the inlet air flow through the sensor bore. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s). Vehicle ignition voltage and ground circuits are also supplied to the MAF sensor.

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP), and the throttle position sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the MAF, MAP, and the throttle position sensors and to each other to determine the appropriate DTC to fail.

The sensors listed below share an ECM supplied 5 V reference circuit

1. IAT sensor 2
2. Humidity sensor
3. Barometric pressure (BARO) sensor

The sensors listed below share an ECM supplied low reference circuit

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Barometric pressure (BARO) sensor

1. DTCs P0096, P0097, P0098, P0102, P0103, P0107, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0237, P0238, P0335, P0336, P2227, P2228, P2229, or P2230 are not set.
2. The engine speed is between 400-6,000 RPM.
3. The engine coolant temperature (ECT) is between -7 and +125°C (+19 and +257°F).
4. The intake air temperature (IAT) is between -20 and +100°C (-4 and +212°F).
5. The DTC runs continuously when the above conditions are met.

The engine control module (ECM) detects that the actual measured airflow from the MAF, MAP, and throttle position sensors is not within range of the calculated airflow that is derived from the system of models for greater than 2 s.

DTC P0101 is a Type B DTC.

DTC P0101 is a Type B DTC.

1. Certain aftermarket air filters may cause this DTC to set.
2. Certain aftermarket air induction systems may cause this DTC to set.
3. Modifications to the air induction system may cause this DTC to set.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522-A Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. If you were sent here from DTC P0068, P0106, P0121, P0236, or P1101; refer to Circuit/System Testing.
4. Ignition ON.
5. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %. If 90 % or greater Refer to «Throttle Body Inspection and Cleaning»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__throttle-body-inspection-and-cleaning) . If less than 90 %
6. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, or P2135»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If Agree
7. Determine the current vehicle testing altitude.
8. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the MAP Sensor parameter is within range
9. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger Refer to Step 12. If equipped with a turbocharger
10. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. If the Boost Pressure Sensor parameter is not in range Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the Boost Pressure Sensor parameter is within range
11. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine. If the Boost Pressure Sensor parameter does not decrease Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the Boost Pressure Sensor parameter does decrease
12. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 PSI) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 PSI) or does not change Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If between 26-52 kPa (3.8-7.5 PSI) and changes
13. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to Circuit/System Testing. If the MAF Sensor parameter changes smoothly and gradually
14. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
15. Verify the DTC does not set. If the DTC does set Refer to Circuit/System Testing for further diagnosis. If the DTC does not set
16. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Check the integrity of the entire air induction system by verifying that none of the following conditions exist: Any damaged components Improper operation of turbocharger wastegate actuator or bypass valve; where equipped Improperly installed components Collapsed, restricted, or damaged components Loose clamps, cracks, or other damage An air flow restriction Restricted air filter Splits, kinks, leaks, or improper connections at the vacuum hoses Vacuum leaks at the intake manifold, MAP sensor, and throttle body Water intrusion Any snow or ice buildup, in cold climates Contamination of the Multifunction Intake Air sensor element If a condition is found Repair or replace component as appropriate. If no condition is found
2. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
3. Test for less than 2 ohms between the ground circuit terminal 4 and ground. If 2 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 2 ohms
4. Ignition ON.
5. Verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition circuit. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition circuit. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
6. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
7. Determine if EL-38522-A Variable Signal Generator or equivalent is available. EL-38522-A, Variable Signal Generator; or equivalent is not available Test or replace the B75C Multifunction Intake Air sensor. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data. Verify the DTC does not set. If the DTC sets Replace the K20 Engine Control Module. If no DTCs set All OK. EL-38522-A, Variable Signal Generator; or equivalent is available
8. Ignition OFF, connect the leads of the EL-38522-A Variable Signal Generator as follows: Red lead to the signal circuit terminal 3 at the harness connector Black leads to ground Battery voltage supply lead to B+
9. Set the EL-38522-A Variable Signal Generator to the following specifications. Signal switch to 5 V Frequency switch to 5 kHz Duty Cycle switch to 50 % (Normal)
10. Engine idling, verify the scan tool MAF Sensor parameter is between 4,950-5,050 Hz. If not between 4,950-5,050 Hz. Replace the K20 Engine Control Module. If between 4,950-5,050 Hz.
11. Test or replace the B75C Multifunction Intake Air sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement.
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAF Sensor

MAF Sensor

The sensors listed below are integrated within the multifunction intake air sensor

1. Intake Air Temperature (IAT) sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Mass Air Flow (MAF) sensor
5. Barometric (BARO) pressure sensor

The MAF sensor is an air flow meter that measures the amount of air flowing in the sensor bore. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition.

The ECM applies 5 V to the MAF sensor signal circuit. The sensor produces a variable frequency signal based on the inlet air flow through the sensor bore. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s). Vehicle ignition voltage and ground circuits are also supplied to the MAF sensor.

The sensors listed below share an ECM supplied 5 V reference circuit

1. IAT sensor 2
2. Humidity sensor
3. Barometric pressure (BARO) sensor

The sensors listed below share an ECM supplied low reference circuit

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Barometric pressure (BARO) sensor

1. The engine is running for at least 1 s.
2. The engine speed is at least 300 RPM.
3. The ignition signal is at least 10 V.
4. The above conditions are met for at least 1 s.
5. The DTC runs continuously when the above conditions are met.

P0102

The ECM detects that the MAF Sensor signal parameter is less than 1,837 Hz (about 0.39 g/s) for at least 250 cylinder firing events.

P0103

The ECM detects that the MAF Sensor signal parameter is at least 13,200 Hz (about 810 g/s) for at least 250 cylinder firing events.

DTCs P0102 and P0103 are Type B DTCs.

DTCs P0102 and P0103 are Type B DTCs.

Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Powertrain Component Views

Powertrain Component Views

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-38522-A Variable Signal Generator

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Engine idling, verify the scan tool MAF Sensor parameter is between 1.75-5.5 g/s. If not between 1.75-5.5 g/s Refer to Circuit/System Testing. If between 1.75-5.5 g/s
2. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to Circuit/System Testing. If the MAF Sensor parameter changes smoothly and gradually
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set. If the DTC does set Refer to Circuit/System Testing for further diagnosis. If the DTC does not set
5. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
2. Test for less than 2 ohms between the ground circuit terminal 4 and ground. If 2 ohms or greater Ignition OFF. Disconnect the sensor chassis ground. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the chassis ground connection. If less than 2 ohms
3. Ignition ON.
4. Verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp and remove the fuse for the ignition circuit. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp and remove the fuse for the ignition circuit. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for greater than 2 ohms between the ignition circuit terminal 5 and ground. If less than 2 ohms, repair the short to ground on the circuit. If greater than 2 ohms, test all the components connected to the circuit and repair or replace as necessary. If a test lamp illuminates
5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
6. Determine if EL-38522-A Variable Signal Generator or equivalent is available. EL-38522-A, Variable Signal Generator; or equivalent is not available Test or replace the B75C Multifunction Intake Air sensor. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data. Verify the DTC does not set. If the DTC sets Replace the K20 Engine Control Module. If no DTCs set All OK. EL-38522-A, Variable Signal Generator; or equivalent is available
7. Ignition OFF, connect the leads of the EL-38522-A Variable Signal Generator as follows: Red lead to the signal circuit terminal 3 at the harness connector Black leads to ground Battery voltage supply lead to B+
8. Set the EL-38522-A Variable Signal Generator to the following specifications. Signal switch to 5 V Frequency switch to 5 kHz Duty Cycle switch to 50 % (Normal)
9. Engine idling, verify the scan tool MAF Sensor parameter is between 4,950-5,050 Hz. If not between 4,950-5,050 Hz. Replace the K20 Engine Control Module. If between 4,950-5,050 Hz.
10. Test or replace the B75C Multifunction Intake Air sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement.
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAP Sensor

MAP Sensor, if equipped with Turbocharger

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, barometric pressure (BARO); and if equipped turbocharger output. A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance.

The MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. If equipped, a turbocharger can increase the pressure above BARO, when the vehicle is operated at wide-open throttle (WOT). The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.

1. DTCs P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0128, P0335, P0336 are not set.
2. The engine speed is between 400-6500 RPM.
3. The engine coolant temperature (ECT) sensor is between -7 to +125°C (19.4 and 257°F).
4. The intake air temperature (IAT) sensor is between -20 to +125°C (-4 and +257°F).
5. This DTC runs continuously when the above conditions are met.

The ECM detects that the MAP Sensor pressure is not within range of the calculated pressure that is derived from a system of models for more than 0.5 s.

DTC P0106 is a Type B DTC.

DTC P0106 is a Type B DTC.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTC are set
3. If you were sent here from DTC P0068, P0101, P0121, P0236, or P1101; refer to Circuit/System Testing.
4. Ignition ON.
5. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%. If 90% or greater Refer to «Throttle Body Inspection and Cleaning»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__throttle-body-inspection-and-cleaning) . If less than 90%
6. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, or P2135»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If Agree
7. Determine the current vehicle testing altitude.
8. Verify the scan tool MAP Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. If the MAP Sensor parameter is not in range Refer to Circuit/System Testing. If the MAP Sensor parameter is in range
9. Verify the engine is equipped with a turbocharger. If not equipped with a turbocharger Refer to Step 12. If equipped with a turbocharger
10. Verify the scan tool Boost Pressure Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. If the Boost Pressure Sensor parameter is not in range Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the Boost Pressure Sensor parameter is in range
11. Verify the scan tool Boost Pressure Sensor parameter decreases after starting the engine. If the Boost Pressure Sensor parameter does not decrease Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) for further diagnosis. If the Boost Pressure Sensor parameter is within range
12. Engine idling, verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 PSI) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 PSI) or does not change Refer to Circuit/System Testing. If between 26-52 kPa (3.8-7.5 PSI) and changes
13. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. If the MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If the MAF Sensor parameter does change smoothly and gradually
14. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
15. Verify a DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
16. All OK.

1. Check the integrity of the entire air induction system and verify that none of the following conditions exist: Any damaged components Improper operation of turbocharger wastegate actuator or bypass valve, if equipped Loose or improper installation of the turbocharger and the charge air cooler, including the flexible ductwork, if equipped An air flow restriction Any vacuum leak Improperly routed vacuum hoses In cold climates, inspect for any snow or ice buildup at the BARO port on the ECM, if equipped A restriction in the MAP Sensor port or the BARO port Proper operation of the positive crankcase ventilation system Missing, restricted or leaking exhaust components. Refer to «Symptoms - Engine Exhaust»(/buick/encore/i-2012-2016/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Engine mechanical condition; for example: low compression or incorrect timing chain installation. Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) . If a condition is found Repair or replace the component as appropriate. If no condition is found
2. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
3. Test for less than 2 ohms between the low reference circuit terminal 2 and ground. If 2 ohms or greater Ignition OFF, disconnect the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 2 ohms
4. Ignition ON.
5. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. NOTE: If the signal circuit is shorted to a voltage the ECM or the MAP Sensor may be damaged. If greater than 5.2 V Ignition OFF, disconnect the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
6. Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5 V. If 0.5 V or greater Ignition OFF, disconnect the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 0.5 V
7. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
8. Ignition ON, verify the scan tool MAP voltage parameter is greater than 4.5 V. If 4.5 V or less Ignition OFF, disconnect the K20 Engine Control Module. Remove the jumper wire, test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.5 V
9. Test or replace the B74 Manifold Absolute Pressure Sensor.

Note. You must perform the Circuit/System Testing in order to Check the integrity of the MAP Sensor circuits before proceeding with the Component Testing.

Skewed Sensor Test

1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor from the engine. Connect the harness to the sensor, if disconnected.
2. Ignition ON, apply 17 kPa (5.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A . Verify the scan tool MAP Sensor pressure parameter decreases between 13-21 kPa (1.8-3.0 PSI). If the parameter does not decrease between 13-21 kPa (1.8-3.0 PSI). Replace the B74 Manifold Absolute Pressure Sensor. If the parameter does decrease between 13-21 kPa (1.8-3.0 PSI).
3. Apply 34 kPa (10.0 in Hg) of vacuum to the B74 Manifold Absolute Pressure Sensor, with the GE-23738-A . Verify the scan tool MAP Sensor pressure parameter decreases between 30-38 kPa (4.4-5.5 PSI). If the parameter does not decrease between 30-38 kPa (4.4-5.5 PSI). Replace the B74 Manifold Absolute Pressure Sensor. If the parameter does decrease between 30-38 kPa (4.4-5.5 PSI).
4. All OK.

Erratic Signal Test

1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor and disconnect the harness.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
5. Connect a DMM between the jumper wire and ground.
6. Ignition ON, observe the DC voltage on the DMM. Slowly apply between 0-15 kPa (0-4.4 in Hg) of vacuum to the sensor with the GE-23738-A . Verify the voltage changes, without any spikes or dropouts, between 0.2-4.9 V. If not between 0.2- 4.9 V or has spikes or dropouts Replace the B74 Manifold Absolute Pressure Sensor. If between 0.2 -4.9 V and there are no spikes or dropouts
7. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Manifold Absolute Pressure Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

MAP Sensor

MAP Sensor, when equipped with Turbocharger

The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature, barometric pressure (BARO); and where equipped turbocharger output. A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance.

The MAP sensor wiring includes 3 circuits. The engine control module (ECM) supplies a regulated 5 V to the sensor on a 5 V reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. Where equipped, a turbocharger can increase the pressure above BARO, when the vehicle is operated at wide-open throttle (WOT). The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.

P0107

1. DTCs P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223 or P0641 are not set
2. The engine speed is between 400-6,500 RPM.
3. The throttle position is greater than or equal to 0% when the engine speed is less than or equal to 1,000 RPM or
4. The throttle position is greater than or equal to 12.5% when the engine speed is greater than 1,000 RPM.
5. This DTC runs continuously when the above conditions are met.

P0108

1. The engine has been running for a length of time that is determined by the start-up coolant temperature. The length of time ranges from 5.5 min at colder than -30°C (-22°F) to 10 s at greater than 30°C (+86°F).
2. DTCs P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223 or P0641 are not set
3. The throttle position is less than or equal to 1% when the engine speed is less than or equal to 1,200 RPM. or
4. The throttle position is less than or equal to 20% when the engine speed is greater than 1,200 RPM.
5. This DTC runs continuously when the above conditions are met.

P0107

The ECM detects that the MAP sensor voltage is less than 0.05 V for greater than 5 s.

P0108

The ECM detects that the MAP sensor voltage is more than 4.9 V for greater than 5 s.

DTCs P0107 and P0108 are Type B DTCs.

DTCs P0107 and P0108 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Engine idling, verify the scan tool MAP voltage parameter is between 0.3 and 4.8 V and changes with accelerator pedal input. If not between 0.3 and 4.8 V or does not change Refer to Circuit/System Testing. If between 0.3 and 4.8 V and changes
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
5. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
6. All OK.

1. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B74 Manifold Absolute Pressure sensor.
2. Test for less than 2 ohms between the low reference circuit terminal 2 and ground. If 2 ohms or greater Ignition OFF, disconnect the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 2 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than 4.8 V Ignition OFF, disconnect the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. If greater than 5.2 V Ignition OFF, disconnect the K20 Engine Control Module. Ignition ON, test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
5. Ignition ON, verify the scan tool MAP Sensor parameter is less than 0.5 V. If 0.5 V or greater Ignition OFF, disconnect the K20 Engine Control Module. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If less than 0.5 V
6. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1.
7. Ignition ON, verify the scan tool MAP voltage parameter is greater than 4.5 V. If 4.5 V or less Ignition OFF, disconnect the K20 Engine Control Module. Remove the jumper wire, test for infinite resistance between the signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 4.5 V
8. Test or replace the B74 Manifold Absolute Pressure sensor.

Note. You must perform the Circuit/System Testing in order to Check the integrity of the MAP sensor circuits before proceeding with the Component Testing.

Skewed Sensor Test

1. Ignition OFF, remove the B74 Manifold Absolute Pressure sensor from the engine. Connect the harness to the sensor, if disconnected.
2. Ignition ON, apply 17 kPa (5.0 inHg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A Vacuum Pump . Verify the scan tool MAP pressure parameter decreases between 13 and 21 kPa (1.8 and 3.0 PSI). If the parameter does not decrease between 13 and 21 kPa (1.8 and 3.0 PSI). Replace the B74 Manifold Absolute Pressure sensor. If the parameter does decrease between 13 and 21 kPa (1.8 and 3.0 PSI).
3. Apply 34 kPa (10.0 inHg) of vacuum to the B74 Manifold Absolute Pressure sensor, with the GE-23738-A Vacuum Pump . Verify the scan tool MAP pressure parameter decreases between 30 and 38 kPa (4.4 and 5.5 PSI). If the parameter does not decrease between 30 and 38 kPa (4.4 and 5.5 PSI). Replace the B74 Manifold Absolute Pressure sensor. If the parameter does decrease between 30 and 38 kPa (4.4 and 5.5 PSI).
4. All OK.

Erratic Signal Test

1. Ignition OFF, remove the B74 Manifold Absolute Pressure sensor and disconnect the harness.
2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
5. Connect a DMM between the jumper wire and ground.
6. Ignition ON, observe the DC voltage on the DMM. Slowly apply between 0 and 15kPa of vacuum to the sensor with the GE-23738-A Vacuum Pump. Verify the voltage changes, without any spikes or dropouts, between 0.2 and 4.9 V. If not between 0.2 and 4.9 V or has spikes or dropouts Replace the B74 Manifold Absolute Pressure sensor. If between 0.2 and 4.9 V and there are no spikes or dropouts
7. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Manifold Absolute Pressure Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

IAT Sensor 1

IAT Sensor 1

The sensors listed below are integrated within the multifunction intake air sensor

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. MAF sensor
5. BARO pressure sensor

The intake air temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the engine control module (ECM) supplied 5 V signal circuit. The signal varies with inlet air temperature in the sensor bore and is displayed by the scan tool as °C (°F).

The IAT sensor 1 produces an analog signal on pin-8 of the sensor. The IAT sensor 2 produces a frequency modulated signal on pin-1 of the sensor.

The sensors listed below share an ECM supplied 5 V reference circuit

1. IAT sensor 2
2. Humidity sensor
3. BARO pressure sensor

The sensors listed below share an ECM supplied low reference circuit

1. IAT sensor 1
2. IAT sensor 2
3. Humidity sensor
4. Barometric pressure (BARO) sensor

IAT Sensor 1 - Temperature, Resistance, Voltage Table

P0112, P0113, and P0114

1. The ignition is ON, or the engine is running.
2. The DTCs run continuously when the above conditions are met.

P0112

The ECM detects that the IAT sensor signal is warmer than 149°C (300°F) for at least 5 s.

P0113

Note. The scan tool display range is between -40 and +150°C (-40 and +302°F).

The ECM detects that the IAT sensor signal is colder than -60°C (-76°F) for at least 5 s.

P0114

The ECM detects that the IAT sensor signal is intermittent or has abruptly changed for at least 5 s.

1. DTCs P0112, P0113, and P0114 are Type B DTCs.
2. The ECM commands the cooling fans ON.

DTCs P0112, P0113, and P0114 are Type B DTCs.

With the ignition ON, when the engine is cold and not running, a properly functioning IAT sensor 1 will gradually increase the scan tool IAT Sensor 1 parameter. This is due to the heat that is generated by the multifunction intake air sensor internal heating elements.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that DTC DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
3. Ignition ON.
4. Verify the following scan tool parameters are within 25°C (45°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not within 25°C (45°F) Refer to Circuit/System Testing. If within 25°C (45°F)
5. Engine idling, verify the following scan tool parameters are between: -38 and +149°C (-36 and +300°F). IAT Sensor 1 IAT Sensor 2 IAT Sensor 3; where equipped If not between: -38 and +149°C (-36 and +300°F) Refer to Circuit System Testing. If between: -38 and +149°C (-36 and +300°F)
6. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
7. Verify the DTC does not set. If the DTC does set Refer to Circuit/System Testing. If the DTC does not set
8. All OK

Note. You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, and all vehicle systems OFF, it may take up to 2 min. for all vehicle systems to power down. Disconnect the harness connector at the B75C Multifunction Intake Air sensor.
2. Test for less than 2 ohms between the low reference circuit terminal 7 and ground. If 2 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms replace the K20 Engine Control Module. If less than 2 ohms
3. Ignition ON, test for 4.8-5.2 V between signal circuit terminal 8 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON, test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
4. Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than -39°C (-38°F). If warmer than -39°C (-38°F). Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 8 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If colder than -39°C (-38°F).
5. Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 8 and the low reference circuit terminal 7.
6. Verify the scan tool IAT Sensor 1 parameter is warmer than 148°C (298°F). If colder than 148°C (298°F). Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If warmer than 148°C (298°F).
7. Test or replace the B75C Multifunction Intake Air sensor.

Multifunction Intake Air Sensor

1. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
2. Test the IAT sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance - Intake Air Temperature Sensor (Bosch Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) , «Temperature Versus Resistance - Intake Air Temperature Sensor (Delco Sensor)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance-intake-air) table for Bosch Sensors. The resistance values should be in range of the table values. If not within the specified range. Replace the B75C Multifunction Intake Air sensor. If within the specified range.
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Mass Airflow Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for multifunction intake air sensor replacement
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

ECT Sensor

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit.

The purpose of this diagnostic is to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the engine is OFF. If the required engine OFF time is met at start-up, the ECM will compare the temperature difference between the actual measured ECT and a calibrated ECT model. The information for this model is derived from the previous drive cycle and includes the accumulated mass air flow (MAF), the engine run time, the ambient air temperature and the ECT at the end of the drive cycle.

If the ECM detects that the temperature difference between the measured and modeled ECT is not within an acceptable operating range of each other, then the ECM will continue to run this diagnostic to determine if a block heater was active during the engine OFF time.

1. The ignition is ON, or the engine is running.
2. DTCs P0111, P0112, P0113, P0117, P0118, P0722, P0723 or P2610 are not set.
3. The ignition has been off for greater than 8 h before the engine is started.
4. This DTC runs continuously within the enabling conditions.

P0116 Engine Running, Sensor Signal Stuck Test

1. The ECM detects that the ECT sensor signal has abruptly changed a minimum of 20°C (68°F) warmer than intake air temperature (IAT) at engine start.
2. The measured ECT is greater than measured IAT at engine start, is not within range of the calibrated model.

P0116 Engine Running, Sensor Within Range Test

1. The ECT at engine start is not within range of the calibrated model.
2. The ECT is greater than measured IAT at engine start, is not within range of the calibrated model.

1. DTC P0116 is a Type B DTC.
2. The cooling fans will be commanded ON.
3. The A/C compressor will be commanded OFF.

DTC P0116 is a Type B DTC.

1. Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor. Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.
2. An intake air temperature (IAT) sensor that is biased colder at various ambient temperatures due to greater resistance than is normal will increase the range between these 2 sensors. Measure and record the resistance of the IAT sensor at various ambient temperatures, then compare those measurements to the Temperature vs. Resistance table. Refer to «Temperature Versus Resistance»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance) .
3. Test the ECT sensor at various temperature levels in order to evaluate the possibility of a biased sensor. A sensor that is biased warmer can result in a driveability condition. Refer to «Temperature Versus Resistance»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance) .
4. A slight to moderate resistance in the IAT sensor signal circuit or low reference circuit will increase the range between these two sensors. This condition results in a greater voltage on the IAT sensor signal circuit, which is interpreted by the ECM as a colder IAT.
5. If the condition is intermittent, allow the vehicle to sit for greater than 8 h with the ignition OFF, may help isolate the condition. Compare the scan tool and ECT Sensor temperature sensor values at ignition on. The Radiator Coolant Temperature Sensor and the ECT Sensor values should display within 3°C (5°F).

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0112, P0113, P0117, or P0118 are not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Ignition off, inspect the cooling system surge tank for the proper coolant level. Refer to «Loss of Coolant»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) , and «Cooling System Draining and Filling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) .
3. If the ignition has been OFF for 8 h or greater, observe the scan tool parameters list below. The temperatures should be within 20°C (68°F). ECT Sensor IAT Sensor
4. Engine running, observe the ECT Sensor parameter. The reading should be between -39 to +120°C (-38 to +148°F) depending on the current ambient temperature and the vehicle operating conditions.
5. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

1. Ignition OFF, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor.
2. Inspect the B34 Engine Coolant Temperature Sensor terminals for corrosion and for engine coolant leaking through the sensor.
3. Ignition OFF for 1 min, test for less than 5 ohms between the low reference circuit terminal 2 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
4. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F). If greater than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool ECT Sensor parameter is greater than 130°C (266°F). If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
6. If all circuits test normal, test or replace the B34 Engine Coolant Temperature Sensor.

Static Test

1. Ignition off, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor.
2. Test the B34 Engine Coolant Temperature Sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance) table and verify that the resistance is within 5% of the specification. If not within the specified range, replace the B34 Engine Coolant Temperature Sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Engine Coolant Temperature Sensor Replacement (Water Outlet)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) , «Engine Coolant Temperature Sensor Replacement (Radiator)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

ECT Sensor

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit. This diagnostic checks for an open, short to ground or an intermittent circuit condition between the ECM and ECT sensor.

P0117

1. The ignition is ON. OR
2. The engine is running for greater than 10 s. OR
3. The engine run time is less than 10 s when the intake air temperature (IAT) is colder than 50°C (122°F).
4. This DTC runs continuously within the enabling conditions.

P0118

1. The ignition is ON. OR
2. The engine is running for greater than 10 s. OR
3. The engine run time is less than 10 s when the IAT is warmer than 0°C (32°F).
4. This DTC runs continuously within the enabling conditions.

P0119

1. This DTC runs continuously within the enabling conditions.

P0117

The ECM detects that the ECT is warmer than 149°C (300°F) for greater than 5 s.

P0118

The ECM detects that the ECT is colder than -39°C (-38°F) for greater than 5 s.

P0119

The ECM detects that the ECT is intermittent or has abruptly changed for greater than 4 seconds.

1. DTC P0117, P0118 or P0119 are a Type B DTC.
2. The cooling fans will be commanded ON.
3. The Engine Coolant Temperature Gauge is inoperative.
4. The AC compressor will be commanded OFF.

DTC P0117, P0118 or P0119 are a Type B DTC.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool ECT Sensor parameter is between -39 to + 120°C (-38 to +248°F) and changes with engine run time. If not between -39 to + 120°C (-38 to +248°F) or does not change Refer to Circuit/System Testing. If between -39 to + 120°C (-38 to +248°F) and changes
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
5. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
3. Ignition ON.
4. Verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F). If warmer than -39°C (-38°F) Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If colder than -39°C (-38°F)
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool ECT sensor parameter is warmer than 137°C (280°F). If colder than 137°C (280°F) Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If warmer than 137°C (280°F)
7. Test or replace the B34 Engine Coolant Temperature Sensor.

1. Ignition OFF, disconnect the harness connector at the B34 Engine Coolant Temperature Sensor.
2. Test the ECT sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the «Temperature Versus Resistance»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance) table. The resistance values should be in range of the table values. If not within the specified range Replace the B34 Engine Coolant Temperature Sensor. If within the specified range
3. Test for infinite resistance between each terminal and the sensor housing. If less than infinite resistance Replace the B34 Engine Coolant Temperature Sensor. If infinite resistance
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Engine Coolant Temperature Sensor Replacement (Water Outlet)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) , «Engine Coolant Temperature Sensor Replacement (Radiator)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Engine Control Module Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) engine control module replacement, programming, and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Throttle Position Sensor 1

Throttle Position Sensor 2

The throttle body assembly contains 2 throttle position sensors. The throttle position sensors are mounted to the throttle body assembly and are not serviceable. The throttle position sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the throttle position sensors with a common 5 V reference circuit, a common low reference circuit, and two independent signal circuits.

The throttle position sensors have opposite functionality. throttle position sensor 1 signal voltage decreases and throttle position sensor 2 signal voltage increases as the accelerator pedal increases to wide open throttle (WOT).

P0122, P0123, P0222, and P0223

1. DTC P06A3 is not set.
2. The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.
3. The ignition is ON or the engine is operating.
4. DTC P0122, P0123, P0222, P0223 run continuously when the above conditions are met.

P0121

1. No Active or Pending DTCs.
2. The engine speed is between 400-7,000 RPM.
3. The engine coolant temperature (ECT) is between -7 to +125°C (19-257°F).
4. The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
5. DTC P0121 runs continuously when the above conditions are met.

P2135

1. DTC P0122, P0123, P0222, P0223, or P06A3 is not set.
2. The run/crank or powertrain relay voltage is greater than 6 V and reduced power is not active.
3. The ignition is ON or the engine is operating.
4. DTC P2135 runs continuously when the above conditions are met.

P0121

The ECM detects the throttle position sensor is stuck within range for greater than 1 s.

P0122

The ECM detects the throttle position sensor 1 voltage is less than 0.325 V for greater than 1 s.

P0123

The ECM detects the throttle position sensor 1 voltage is greater than 4.75 V for greater than 1 s.

P0222

The ECM detects that the throttle position sensor 2 voltage is less than 0.25 V for greater than 1 s.

P0223

The ECM detects the throttle position sensor 2 voltage is greater than 4.59 V for greater than 1 s.

P2135

The ECM detects the difference between the throttle position sensor 1 and throttle position sensor 2 exceeds a predetermined value for greater than 1 s.

1. DTC P0122, P0123, P0222, P0223, and P2135 are Type A DTCs.
2. DTC P0121 is a Type B DTC.
3. The ECM commands the TAC system to operate in the Reduced Engine Power mode.
4. A message center or an indicator displays Reduced Engine Power.
5. Under certain conditions the control module commands the engine OFF.

1. DTCs P0122, P0123, P0222, P0223, and P2135 are Type A DTCs.
2. DTC P0121 is a Type B DTC.

1. A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
2. If the accelerator pedal is pressed to the wide open throttle position, the throttle blade angle or Throttle Position angle is limited to less than 40 percent.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Throttle Actuator Control (TAC) System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. If you were sent here from DTC P0068, P0101, P0106, or P1101 refer to Circuit/System Testing.
3. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the DTCs are set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) for further diagnosis. If none of the DTCs are set
4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %. 90 % or greater Refer to «Throttle Body Inspection and Cleaning»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__throttle-body-inspection-and-cleaning) . If less than 90 %
5. Verify the scan tool Throttle Position Sensor 1 and Throttle Position Sensor 2 voltage parameters are between 1.0-4.0 V and change with accelerator pedal input. If not between 1.0-4.0 V or does not change Refer to Circuit/System Testing If between 1.0-4.0 V and changes
6. Verify the scan tool Throttle Position Sensor 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to Circuit/System Testing If Agree
7. Determine the current vehicle testing altitude.
8. Verify the scan tool MAP Sensor pressure parameter is within range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table. The MAP Sensor pressure is not in range Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . The MAP Sensor pressure is within range
9. Engine idling.
10. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If between 26-52 kPa (3.8-7.5 psi) and changes
11. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. The MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . The MAF Sensor parameter changes smoothly and gradually
12. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi). The parameters are not within 3 kPa (0.4 psi) Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . The parameters are within 3 kPa (0.4 psi)
13. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. The parameters are not within 20 kPa (2.9 psi) Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . The parameters are within 20 kPa (2.9 psi)
14. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
15. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing If the DTC does not set
16. All OK

1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at Q38 Throttle Body. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal C and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If less than 5 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
5. Ignition ON.
6. Test for less than 1 V between the throttle position sensor 1 signal circuit terminal D and ground. If 1.0 V or greater Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If 1.0 V or less
7. Install a 3 A fused jumper wire between throttle position sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E.
8. Verify the scan tool throttle position sensor 1 voltage parameter is greater than 4.8 V. If 4.8 V or less Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If 4.8 or greater
9. Test for 4.8-5.2 V between the throttle position sensor 2 signal circuit terminal F and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 4.8-5.2 V
10. Test or replace the Q38 Throttle Body.

1. «Throttle Body Assembly Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup

Repair Verification

1. Install any components that have been removed or replaced during diagnosis.
2. Perform any adjustments, programming or setup procedures that are required when a component is removed or replaced.
3. Clear the DTCs with a scan tool.
4. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
5. Ignition ON.
6. Verify the Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Test or replace the Q38 Throttle Body assembly. If Agree
7. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not set. If DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If DTC does not set
8. All OK

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Note. Note: The engine coolant temperature sensor is referred to as B34A Engine Coolant Temperature Sensor 1 in schematics and other areas.

The engine control module (ECM) monitors the temperature of the engine coolant for engine control and enabling criteria for some diagnostics. The amount of air flow into an engine is proportional to the amount of heat an engine generates. The ECM monitors the amount of air flow into the engine to calculate engine coolant temperature (ECT). The ECM uses the calculated temperature to determine if the engine has warmed up to the thermostat regulating temperature. If the ECT does not increase normally or does not reach the thermostat regulating temperature, diagnostics that use the ECT as enabling criteria, may not run when expected. If the ECT fails to reach the thermostat regulating temperature, before a predetermined amount of air flow enters the engine, the DTC sets.

1. DTCs P00B3, P00B6, P0101, P0102, P0103, P0111, P0112, P0113, P0116, P0117 or P0118 are not set.
2. Average Airflow is greater than 11 g/s.
3. Thermostat Heater duty commanded cycle 10%.
4. Engine not run time 30 min
5. Engine run time between 22 s and 30 min
6. The DTC runs once per ignition key cycle.

The ECM detects that the actual engine coolant temperature is 26°C (78.8°F) colder than the commanded engine coolant temperature while the IAT is between 10-65°C (50-149°F)

or

The ECM detects that the actual engine coolant temperature is 46°C (114.8°F) colder than the commanded engine coolant temperature while the IAT is between -7°C to +10°C (-19.4 to+50°F)

DTC P0128 is a Type B DTC.

DTC P0128 is a Type B DTC.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Verify the cooling system is filled to the correct coolant level. Refer to «Loss of Coolant»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) , and «Cooling System Draining and Filling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If the coolant level is not correct Repair as necessary If the coolant level is correct
2. Verify the DTC P00B7, P0116, P0117, P0118, P0597, P0598, or P0599 is not set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If a DTC is not set
3. Engine running for 15 min with the A/C OFF, increase the engine speed to 3,000 RPM.
4. Verify the scan tool ECT Sensor parameter is greater than 79°C (174°F) when commanding the Engine Coolant Thermostat Heater to 0%. If less than 79°C (174°F) Replace the E41 Engine Coolant Thermostat Heater. If greater than 79°C (174°F)
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
6. Verify the DTC does not set. If the DTC sets Refer to Step 1. If the DTC does not set
7. All OK.

1. Ignition OFF, disconnect the B34 Engine Coolant Temperature Sensor harness connector at the sensor.
2. Test for refer to «Temperature Versus Resistance»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__temperature-versus-resistance) Temperature Versus Resistance between the signal circuit terminal 1 and the low reference terminal 2. If the temperature versus resistance are not within the specified ranges Replace the B34 Engine Coolant Temperature Sensor. If the temperature versus resistance are within the specified ranges
3. Test for infinite resistance between each terminal and the sensor housing. If less than infinite resistance Replace the B34 Engine Coolant Temperature Sensor. If infinite resistance
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Engine Coolant Temperature Sensor Replacement (Water Outlet)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) , «Engine Coolant Temperature Sensor Replacement (Radiator)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Engine Coolant Thermostat Housing Removal»(ref-614552-S36072404672014050700000)
3. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming and setup.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

HO2S 1 or 2

HO2S 1 or 2

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, closed loop is entered. The control module uses the HO2S voltage to determine the air to fuel ratio. An HO2S voltage that increases toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the control module to calculate the air to fuel ratio sooner.

DTC P0131 or P0137

1. DTCs P0068, P0106, P0107, P0108, P0121, P0122, P0123, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135 and P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. The mass air flow (MAF) is between 2-60 g/s.
5. The fuel composition is less than 87% ethanol.
6. The fuel system is in Closed Loop.
7. The vehicle is not decelerating.
8. The DTC P0131 runs continuously when the above conditions are met for greater than 3 s.
9. The DTC P0137 runs continuously when the above conditions are met for greater than 5 s.

DTC P0132 or P0138

1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0121, P0122, P0123, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135 and P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. The fuel composition is less than 87% ethanol.
5. The fuel system is in Closed Loop.
6. Engine run time is greater than 5 s.
7. The vehicle is not decelerating.
8. The DTC P0132 and P0138 run continuously when the above conditions are met for greater than 3 s.

DTC P0134 or P0140

1. DTCs P0068, P0101, P0102, P0103, P0121, P0122, P0123, P0222, P0223, P1516, P2101, P2119, P2135 and P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. HO2S heater warm up is finished.
4. Engine run time is greater than 5 s.
5. The engine has been operating for greater than 50 s.
6. The fuel composition is less than 87% ethanol.

P0131

The engine control module (ECM) detects that the heated oxygen sensor (HO2S) voltage is less than 20 mV for greater than 38 s.

P0137

The engine control module (ECM) detects that the heated oxygen sensor (HO2S) is shorted to ground for greater than 38 s.

P0132 or P0138

The ECM detects that the heated oxygen sensor (HO2S) voltage is greater than 1 050 mV for greater than 10 s.

P0134 or P0140

The ECM detects that the heated oxygen sensor (HO2S) voltage is greater than 1 700 mV for greater than 10 s.

DTCs P0131, P0132, P0134, P0137, P0138 and P0140 are Type B DTCs.

DTCs P0131, P0132, P0134, P0137, P0138 and P0140 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON
2. Verify no HO2S heater DTCs are set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set
3. Engine running.
4. Verify the scan tool HO2S 1 or 2 parameters are between 50-1,050 mV. If not between 50-1,050 mV Refer to Circuit/System Testing. If between 50-1,050 mV
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
6. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
7. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the appropriate B52 Heated Oxygen Sensor harness connector. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON.
2. Test for 1.7-3.0 V between the high signal circuit terminal 4 and ground. If less than 1.7 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the high signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the high signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 3 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON. Test for less than 1 V between the high signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 1.7-3.0 V
3. Verify the scan tool HO2S 1 or 2 parameter is between 1.7-3.0 V. If less than 1.7 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON. Test for infinite resistance between the low signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If greater than 1.7 V
4. Connect a 3 A fused jumper wire between the high signal circuit terminal 4 and the low signal circuit terminal 3.
5. Verify the scan tool HO2S 1 or 2 parameter displays 0.0 V. If greater than 0.0 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON. Test for less than 2 ohms in the low signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 1 V between the low signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If 0.0 V
6. Verify none of the conditions listed below exist: Water intrusion in the B52 HO2S harness connector Low or high fuel system pressure-Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks Engine vacuum leaks If any of the conditions exist Repair as necessary. If none of the conditions exist
7. Test or replace the B52 Heated Oxygen Sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an HO2S.
4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

HO2S 1 or 2

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 000 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, closed loop is entered. The control module uses the HO2S voltage to determine the air to fuel ratio. An HO2S voltage that increases toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the control module to calculate the air to fuel ratio sooner.

P0131, P0132, P0137, or P0138

1. DTC P0030, P0036, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0443, or P2135 is not set.
2. The engine is operating.
3. The ignition voltage is between 10-32 V.
4. The fuel system is in closed loop.
5. The vehicle is not decelerating.
6. The DTC runs continuously when the above conditions are met for 5 s.

P0134

1. The ECM detects that the heated oxygen sensor (HO2S) 1 parameter is between 400-500 mV for 100 s.
2. The throttle position indicated angle parameter changes more than 1%, 3 times.
3. DTC P0134 sets within 100 s when the above condition is met.

P0140

1. The ECM detects that the heated oxygen sensor (HO2S) 2 parameter is between 425-475 mV.
2. The throttle position indicated angle parameter changes more than 1%, 3 times.
3. DTC P0140 sets within 100 s when the above conditions are met.

P0131

The engine control module (ECM) detects that the heated Oxygen Sensor (HO2S) voltage is less than 20 mV for greater than 38 s.

P0132 and P0138

The ECM detects that the heated Oxygen Sensor (HO2S) voltage is greater than 1 050 mV for greater than 10 s.

P0134

1. The ECM detects that the heated oxygen sensor (HO2S) 1 parameter is between 400-500 mV for 100 s.
2. The throttle position indicated angle parameter changes more than 1%, 3 times.
3. DTC P0134 sets within 100 s when the above conditions are met.

P0137

The engine control module (ECM) detects that the heated Oxygen Sensor (HO2S) voltage is less than 20 mV for greater than 43 s.

P0140

1. The ECM detects that the heated oxygen sensor (HO2S) 2 parameter is between 425-475 mV.
2. The throttle position indicated angle parameter changes more than 1%, 3 times.
3. DTC P0140 sets within 100 s when the above conditions are met.

DTC P0131, P0132, P0134, P0137, P0138, and P0140 are Type B DTCs.

DTC P0131, P0132, P0134, P0137, P0138, and P0140 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify no HO2S heater DTCs are set. If a DTC is set. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set.
3. Engine running.
4. Verify the scan tool HO2S Sensor 1 or 2 parameters are between 50-1,050 mV. If not between 50-1,050 mV. Refer to Circuit/System Testing. If between 50-1,050 mV.
5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
6. Verify the DTC does not set. If the DTC sets. Refer to Circuit/System Testing. If the DTC does not set.
7. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the appropriate B52 Heated Oxygen Sensor harness connector. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON.
2. Test for 1.7-3.0 V between the high signal circuit terminal 4 and ground. If less than 1.7 V. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for the infinite resistance between the high signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the high signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If greater than 3 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the high signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If between 1.7-3.0 V
3. Verify the scan tool heated oxygen sensor 1 or 2 parameter is between 1.7-3.0 V. If less than 1.7 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for infinite resistance between the low signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If greater than 1.7 V
4. Connect a 3 A fused jumper wire between the high signal circuit terminal 4 and the low signal circuit terminal 3.
5. Verify the scan tool heated oxygen sensor 1 or 2 voltage parameter displays 0.0 V. If greater than 0.0 V Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 2 ohms in the low signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms Test for less than 1 V between the low signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If 0.0 V
6. Verify none of the conditions listed below exist: Water intrusion in the B52 Heated Oxygen Sensor harness connector Low or high fuel system pressure-Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks Engine vacuum leaks If any of the conditions exist Repair as necessary. If none of the conditions exist
7. Test or replace the B52 Heated Oxygen Sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
3. Perform the scan tool Heated Oxygen Sensor Resistance learn Reset after replacing a heated oxygen sensor.
4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

HO2S 1 or 2

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, closed loop is entered. The control module uses the HO2S voltage to determine the air to fuel ratio. An HO2S voltage that increases toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the control module to calculate the air to fuel ratio sooner.

DTC P0133

1. DTCs P0068, P0096, P0097, P0098, P00B3, P00B4, P00B6, P00C7, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 and P2450 are not set.
2. The ignition voltage is between 10-32 V.
3. The engine speed parameter is between 1 300-3 500 RPM.
4. The engine coolant temperature (ECT) is hotter than 65°C (149°F).
5. The intake air temperature (IAT) is hotter than -40°C (-40°F).
6. The engine has been operating for greater than 100 s.
7. The mass air flow (MAF) is between 10-35 g/s.
8. The fuel system is in Closed Loop.
9. The vehicle is not decelerating.
10. The DTCs run continuously when the above conditions are met for greater than 1 s.

P013A

1. DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. DTC P013B, P013E, P013F, P2270 and P2271 have run.
5. DTC P013E and P2270 have passed.
6. DTC P013A runs once per trip.

P013B

1. DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. DTC P013A, P013E, P013F, P2270 and P2271 have run.
5. DTC P013F and P2271 have passed.
6. DTC P013B runs once per trip.

P013E

1. DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. DTC P013A, P013B, P013F, P2270 and P2271 have run.
5. DTC P2270 have passed.
6. DTC P013E runs once per trip.

P013F

1. DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. DTC P013A, P013B, P013E, P2270 and P2271 have run.
5. DTC P2270 and P2271 have passed.
6. DTC P013F runs once per trip.

P015A and P015B

1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P16F3, P2101 or P2135 are not set.
2. The ignition voltage is between 10-32 V.
3. The device controls are not active.
4. The fuel level is greater than 10%.
5. The HO2S heater is commanded ON for greater than 40 s.
6. The engine coolant temperature (ECT) is hotter than 60°C (140°F).
7. The intake air temperature (IAT) is hotter than -40°C (-40°F).
8. The engine has been operating for greater than 150 s.
9. The engine speed is between 1 550-3 500 RPM to initially enable the test.
10. The vehicle speed is between 70-125 km/h (44-78 mph) to initially enable the test.
11. The engine speed is between 1 350-3 650 RPM to keep the test enabled.
12. The vehicle speed is between 65-130 km/h (41-81 mph) to keep the test enabled.
13. The mass air flow (MAF) is between 2-20 g/s.
14. The fuel system is in Closed Loop.
15. The evaporative emission (EVAP) diagnostics are not in control of purge.
16. The predicted catalytic converter temperature is between 550-900°C (1 022-1 652°F).
17. DTC P015A runs once per trip, during the deceleration fuel cut-off (DFCO) mode, when the above conditions are met.
18. DTC P015B runs once per trip, during the fuel enrich mode, when the above conditions are met.

P2270

1. DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. The engine speed parameter is between 1 100-3 500 RPM.
5. The mass air flow (MAF) is between 1-30 g/s.
6. The fuel composition is less than 87% ethanol.
7. The fuel system is in Closed Loop.
8. DTC P013A, P013B, P013E, P013F, P2270 and P2271 have run.
9. DTC P2270 and P2271 have passed.
10. DTC P2270 runs once per drive cycle when the above conditions are met for 5 s.

P2271

1. DTCs P0068, P0096, P0097, P0098, P00B6, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P1101, P1516, P2096, P2097, P2101, P2119, P2135, P2176 are not set.
2. The ignition voltage is between 10-32 V.
3. The fuel level is greater than 10%.
4. The engine speed parameter is between 1 100-3 500 RPM.
5. The mass air flow (MAF) is between 1-30 g/s.
6. The fuel composition is less than 87% ethanol.
7. The fuel system is in Closed Loop.
8. DTC P013A, P013B, P013E, P013F and P2270 have run.
9. DTC P013A, P013E and P2270 have passed.
10. DTC P2270 runs once per drive cycle when the above conditions are met for 5 s.

P0133

1. The ECM detects that the HO2S 1 average response time is more than a calculated value.
2. DTC P0133 sets within 60 s when the above condition is met.

P013A

The ECM detects that the accumulated mass air flow monitored during rich to lean transitions between 150-450 mV is more than 6 g.

P013B

The ECM detects that the accumulated mass air flow monitored during rich to lean transitions between 335-650 mV is more than 25 g.

P013E

The ECM detects that the Post O2 sensor voltage is greater than 450 mV and the accumulated mass air flow monitored during the delayed Response Test is greater than 20 g.

P013F

The ECM detects that the Post O2 sensor voltage is less than 350 mV and the accumulated mass air flow monitored during the delayed Response Test is greater than 70 g.

P0140

The ECM detects that the heated oxygen sensor (HO2S) 2 parameter is greater than 1 700 mV.

P2270

1. The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage equal to or less than 775 mV. and
2. The ECM detects that the accumulated mass air flow monitored during the Stuck Lean Voltage Test is more than 38 g.

P2271

1. The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage equal to or less than 100 mV. and
2. The ECM detects that the accumulated mass air flow monitored during the stuck rich voltage test is more than 25 g.

1. DTCs P0133, P0134, P013E, P013F, P0140, P2270 are P2271 Type B DTCs.
2. DTCs P013A and P013B are Type A DTCs.

1. DTCs P0133, P0134, P013E, P013F, P0140, P2270 are P2271 Type B DTCs.
2. DTCs P013A and P013B are Type A DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify no HO2S heater DTCs are set If a HO2S heater DTC is set Refer to «DTC P0131, P0132, P0134, P0137, P0138, or P0140 (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) , «DTC P0131, P0132, P0134, P0137, P0138, or P0140 (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If no HO2S heater DTC is set
3. Allow the engine to reach operating temperature, engine running.
4. Verify the scan tool HO2S Sensor 1 or 2 voltage parameters are between 50-1 050 mV. If not between 50-1 050 mV Refer to «DTC P0131, P0132, P0134, P0137, P0138, or P0140 (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) , «DTC P0131, P0132, P0134, P0137, P0138, or P0140 (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If between 50-1 050 mV
5. Verify none of the following conditions exist: Lean or rich fuel injectors Water intrusion in the HO2S harness connector Low or high fuel system pressure-Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks Engine vacuum leaks Engine oil consumptions-Refer to «Symptoms - Engine Cooling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) . Engine coolant consumption-Refer to «Symptoms - Engine Cooling»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system) . If any of the above conditions exist Repair as necessary. If none of the above conditions exist
6. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
7. Verify the DTC does not set. If the DTC sets Replace the B52 Heated Oxygen Sensor. If the DTC does not set
8. All OK.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

HO2S 1 or 2

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the HO2S signal voltage while calculating the air to fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 000 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, closed loop is entered. The control module uses the HO2S voltage to determine the air to fuel ratio. An HO2S voltage that increases toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the control module to calculate the air to fuel ratio sooner.

P0133

1. DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0443, P1516, P2101, P2119, P2135 or P2176 is not set.
2. The engine coolant temperature (ECT) sensor parameter is more than 70°C (158°F).
3. The ignition signal parameter is between 10-18 V.
4. The fuel level sensor parameter is more than 10%.
5. The engine run time parameter is more than 200 s.
6. The engine speed parameter is between 1 000-3 500 RPM.
7. The manifold absolute pressure (MAP) sensor parameter is more than 30 kPa.
8. The mass air flow (MAF) sensor parameter is between 11-50 g/s.
9. The loop status parameter is closed.
10. The throttle position indicated angle parameter is more than 5%.
11. DTC P0131 runs once per drive cycle when the above conditions are met for 2 s.

P1133

1. DTC P0068, P0101, P0102, P010, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0443, P1516, P2101, P2119, P2135 or P2176 is not set.
2. The ECT sensor parameter is more than 70°C (158°F).
3. The engine speed parameter is between 1 500-3 500 RPM.
4. The system voltage is between 10-18 V.
5. The engine run time parameter is more than 200 s.
6. The loop status parameter is closed.
7. The throttle position indicated angle parameter is more than 5.
8. The fuel level sensor parameter is more than 10%.
9. The MAP sensor parameter is more than 30 kPa.
10. The MAF sensor parameter is between 11-50 g/s.
11. The engine coolant is hotter than 50.25°C (122.45°F).
12. DTC P1133 runs once per drive cycle when the above conditions are met for 2 s.

P2270

1. DTC P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0443, P1133, P1516, P2101, P2119, P2135, P2176 or P2271 is not set.
2. The system voltage is between 10-18 V.
3. The fuel level is more than 10%.
4. Engine run time is equal to or more than 255 s. Then
5. The engine speed is between 1 100-3 200 RPM.
6. The airflow is equal to or more than 0 g/s and equal to or less than 25 g/s.
7. The vehicle speed is equal to or more than 45 km/h (28 MPH) and equal to or less than 129 km/h (80 MPH).
8. The short term fuel trim is equal to or more than 0.9, and equal to or less than 1 065.
9. The loop status parameter is closed.
10. The evaporative emission (EVAP) diagnostics are not in control of purge.
11. The heater warm-up delay is more than 120 s.
12. The catalyst temperature is equal to or more than 650°C (1 202°F), and equal to less than 900°C (1 652°F).
13. DTC P2270 runs once per trip when the above conditions have been met for 2 s.

P2271

1. DTC P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0443, P1133, P1516, P2101, P2119, P2135, P2176 or P2270 is not set.
2. The system voltage is between 10-18 V.
3. The fuel level is more than 10%.
4. Engine run time is equal to or more than 255 s. Then
5. Deceleration fuel cut-off is active.
6. The accelerator pedal position (APP) is stable.
7. The torque converter clutch (TCC) is locked.
8. DTC P013A, P013E, and P2270 have run and passed.
9. DTC P2271 runs once per trip.

P0133

1. The ECM detects that the heated oxygen sensor (HO2S) 1 rich to lean or lean to rich average response time is more than 0.1 s.
2. DTC P0133 sets within 60 s when the above condition is met.

P1133

1. The ECM detects that the heated oxygen sensor (HO2S) 1 rich to lean counts, or the lean to rich counts are less than a calibrated value.
2. DTC P1133 sets within 60 s when the above condition is met.

P2270

1. The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage equal to or more than 775 mV. and
2. The ECM detects that the accumulated mass air flow monitored during the Stuck Lean Voltage Test is more than 45 g.

P2271

1. The ECM detects that the heated oxygen sensor (HO2S) 2 sensor cannot achieve voltage equal to or less than 100 mV. and
2. The ECM detects that the accumulated mass air flow monitored during the stuck rich voltage test is more than 20 g.

DTC P0133, P1133, P2270 and P2271 are Type B DTCs.

DTC P0133, P1133, P2270 and P2271 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify no HO2S heater DTCs are set. If a DTC is set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If a DTC is not set
3. Verify none of the following conditions exist: Lean or rich fuel injectors-Refer to «Fuel Injector Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) Water intrusion in the HO2S harness connector Low or high fuel system pressure, refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel that is contaminated, refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks Engine vacuum leaks Engine oil consumption-Refer to «Oil Consumption Diagnosis»(ref-614552-S42899776582014050700000) Engine coolant consumption-Refer to «Loss of Coolant»(/buick/encore/i-2012-2016/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) If any of the conditions exist Repair as necessary. If any of the conditions exist
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTC does not set. If the DTC sets Test or replace the appropriate B52 HO2S. If the DTC does not set
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a heated oxygen sensor.
4. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) controls a Closed Loop air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. The ECM monitors the heated oxygen sensor (HO2S) signal voltage, and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short term fuel trim values. The short term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The long term fuel trim values change in response to trends in the short term fuel trim The long term fuel trim makes coarse adjustments to fueling in order to re-center and restore control to short term fuel trim. The ideal fuel trim values are around 0 %. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition.

1. DTCs P0030, P0053, P0101, P0102, P0103, P0106, P0107, P0108, P0131-P0135, P0178, P0179, P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300-P0304, P0411, P0442, P0455, P0458, P0496, P0506, P0507, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2227, P2228, P2229, P2230, P2269, P2440, or P2444 are not set.
2. The engine is in Closed Loop status.
3. The catalyst monitor diagnostic intrusive test, post 02 diagnostic intrusive test, and evaporative emissions system leak test are not active.
4. The engine coolant temperature (ECT) is between -20°C and +130°C (-4°F and +266°F).
5. The intake air temperature (IAT) is between -20°C and +150°C (-4°F and +302°F).
6. The manifold absolute pressure (MAP) is between 18-253 kPa (2.6-36.7 psi).
7. The engine speed is between 400-6,100 RPM.
8. The mass air flow (MAF) is between 1.5-505 g/s.
9. The barometric pressure (BARO) is greater than 70 kPa (10.2 psi).
10. The fuel level is greater than 10 % and no fuel sensor fault is present.
11. This diagnostic runs continuously when the above conditions have been met.

1. The average long term fuel trim weighted average value is greater or less than a calibrated value.
2. The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

DTCs P0171 and P0172 are Type B DTCs.

DTCs P0171 and P0172 are Type B DTCs.

1. Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
2. The normal Short Term Fuel Trim and Long Term Fuel Trim parameters should be between +10 and -10 % with 0 % the optimum, with the engine running at operating temperature.
3. Any un-metered air into the engine causes this DTC to set. Thoroughly inspect all areas of the engine for vacuum leaks.
4. A MAF sensor condition can cause this DTC without setting a MAF DTC. If there is a MAF sensor condition, the MAF sensor parameters will appear to be within range.
5. Inspect the air filter for being the correct one for this application. Make sure that the engine oil fill cap is in place and that it is tight. Verify that the engine oil dip stick is fully seated.
6. Certain aftermarket air filters may cause a DTC to set.
7. Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.
8. Certain aftermarket exhaust system components may cause a DTC to set.

Component View Reference

Powertrain Component Views

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify no other DTCs are set. If any other DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no other DTCs are set
3. Verify DTC P0171 or P0172 is not set. If a DTC is set Refer to Circuit/System Testing. If no DTC is set
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
5. Verify DTC P0171 or P0172 is not set. If any of the DTCs set Refer to Circuit/System Testing. If none of the DTCs set
6. All OK.

1. Ignition ON.
2. Verify the manifold absolute pressure sensor is within the range specified for your altitude. Refer to «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) If not within the specified range Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) If within the specified range
3. Engine running at the operating temperature.
4. Verify the Long Term Fuel Trim parameter is between -28.5 % and +33 %. If greater than +33 % Ignition OFF. Inspect for the conditions listed below: Mass air flow (MAF) sensor signal skewed. If the Short Term Fuel Trim parameter changes greater than 20 % when the MAF sensor is disconnected, refer to «DTC P0101»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . Fuel contamination. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Missing, restricted, or leaking exhaust components. Refer to «Symptoms - Engine Exhaust»(/buick/encore/i-2012-2016/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Malfunctioning fuel injectors. Refer to «Fuel Injector Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Split, kinked, or improperly connected vacuum hoses Insufficient fuel in the tank Low fuel pressure. Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings. Leaks in the air induction system and the air intake ducts Missing air filter element Cracked EVAP canister Evaporative pipes obstructed or leaking Leaks in the crankcase ventilation system. If a condition is found, repair as necessary. If no condition is found, test the engine for a mechanical condition. Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) . If less than -28.5 % Ignition OFF. Inspect for the conditions listed below: Mass air flow (MAF) sensor signal skewed. If the Short Term Fuel Trim parameters for both banks changes greater than 20 % when the MAF sensor is disconnected, refer to «DTC P0101»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . Fuel contamination. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Missing, restricted, or leaking exhaust components. Refer to «Symptoms - Engine Exhaust»(/buick/encore/i-2012-2016/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Malfunctioning fuel injectors. Refer to «Fuel Injector Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) Collapsed or restricted air intake duct Excessive fuel pressure. Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) Dirty or restricted air filter Objects blocking the throttle body Improper operation of the evaporative emissions control system Excessive fuel in the crankcase. Change the engine oil as necessary. If a condition is found, repair as necessary. If no condition is found, test the engine for a mechanical condition. Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) . If between -28.5 % and +33 %
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair

Reset the fuel trim after completing the repair.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The chassis control module monitors the voltage signal from the fuel pressure sensor.

1. The engine is running.
2. DTCs P018C, P018D, P0231, P0232, P023F, P064A, P1255 or P06A6 are not active.
3. DTC P0641 has not failed this ignition cycle.
4. Fuel pump control is enabled and the fuel pump control state is normal.
5. The engine has been running for at least 5 seconds.

The chassis control module does not detect a change in the fuel pressure of at least 30 kPa (4.4 psi) when the fuel pump is operating. The fuel pressure sensor performance diagnostic provides a means to detect fuel pressure sensor output that is stuck within the normal operating range of the sensor.

DTCs P018B, P018C and P018D are Type A DTCs.

DTCs P018B, P018C and P018D are Type A DTCs.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Fuel System Description (LUJ) , Fuel System Description (LUV)

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
3. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running.
2. Verify the scan tool Fuel Pressure Sensor Voltage parameter is between 0.2-4.8 V. If not between 0.2-4.8 V Refer to Circuit/System Testing. If between 0.2-4.8 V
3. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B47 Fuel Pressure Sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K38 Chassis Control Module. If less than 10 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K38 Chassis Control Module. If greater than 5.2 V Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K38 Chassis Control Module. If between 4.8-5.2 V
5. Verify the scan tool Fuel Pressure Sensor Voltage parameter is less than 1 V. If 1 V or greater Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module, ignition ON. Test for less than 1 V between the signal circuit terminal 1 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K38 Chassis Control Module. If less than 1 V
6. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3, wait 15 seconds.
7. Verify the scan tool Fuel Pressure Sensor Voltage parameter is greater than 4.8 V. If 4.8 V or less Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module. Test for infinite resistance between the signal circuit terminal 1 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K38 Chassis Control Module. If greater than 4.8 V
8. Test or replace the B47 Fuel Pressure Sensor.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for chassis control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver. If the ECM detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.

1. The engine is running for greater than 1 s.
2. The ignition voltage is greater than 11 V.
3. The DTCs run continuously when the above conditions are met for greater than 5 s.

The control module detects an incorrect voltage on the fuel injector control circuit for greater than 5 s.

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, and P0271 are Type B DTCs.

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, and P0271 are Type B DTCs.

Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis .

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tool

CH 34730-2C Noid Light , if available

1. Engine cranking or running.
2. Verify the scan tool parameters listed below do not display Malfunction. Cylinder 1-4 Injector Control Circuit Low Voltage Test Status Cylinder 1-4 Injector Control Circuit Open Test Status Cylinder 1-4 Injector Control Circuit High Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
5. All OK.

1. Ignition OFF, disconnect the harness connector at the appropriate Q17 Fuel Injector, ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp, and disconnect all components on the circuit. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Replace the fuse, ignition ON. Verify the fuse is good after connecting each of the components one at a time. If the fuse opens, replace the component that opens the fuse when connected. If the fuse is good, all OK. If the test lamp illuminates
3. Ignition OFF, connect the test lamp to the affected fuel injector connector.
4. Engine cranking.
5. Verify the test lamp turns ON and OFF. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the X2 harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If the test lamp turns ON and OFF
6. Test or replace the appropriate Q17 Fuel Injector.

Fuel Injector Diagnosis

Perform the Diagnostic Repair Verification after completing the repair.

1. «Fuel Injector Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Engine Control Module replacement, programming, and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) supplies voltage to the chassis control module when the ECM detects that the ignition is on. The voltage from the ECM to the chassis control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the chassis control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel line pressure.

P0231, P023F

The ignition voltage is between 9-18 V.

P0232

The control enable voltage signal supplied for the ECM to chassis control module is inactive for 4 seconds after engine has been shut off.

The chassis control module detects a fault on the fuel pump voltage circuit that is less than 11 V or greater than 18 V.

DTCs P0231, P0232, and P023F are Type A DTCs.

DTCs P0231, P0232, and P023F are Type A DTCs.

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

On vehicles equipped with a high pressure mechanical pump on Direct Fuel Injection engines, the vehicle may continue to run even though the pump in the fuel tank is not operating.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Fuel System Description (LUJ) , Fuel System Description (LUV)

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A7 Fuel Pump and Level Sensor Assembly. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 2 and ground. If 10 ohms or greater Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K38 Chassis Control Module. If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 1 and the low reference circuit terminal 2.
4. Ignition ON.
5. Verify the test lamp turns ON and OFF when commanding the fuel pump ON and OFF using the scan tool ECM fuel pump enable control function. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K38 Chassis Control Module. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K38 Chassis Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K38 Chassis Control Module. If the test lamp turns ON and OFF
6. Replace the A7 Fuel Pump and Level Sensor Assembly.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Fuel Tank Fuel Pump Module Replacement (AWD)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__fuel-tank-fuel-pump-module-replacement) , «Fuel Tank Fuel Pump Module Replacement (FWD)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__fuel-tank-fuel-pump-module-replacement)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for chassis control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, Intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

1. DTCs P0010, P0011, P0013, P0014, P0033, P0034, P0035, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0222, P0223, P0234, P0236, P0237, P0238, P0243, P0245, P0246, P0299, P16F3, P2101, P2227, P2228, P2229 or P2230 are not set.
2. Engine speed between 2,450-6,000 RPM.
3. Desired boost pressure between 135-220 kPa (19.58-31.90 PSI).
4. Ambient pressure between 60-120 kPa (8.70-17.40 PSI).
5. Coolant temperature between -40 to +120°C (-40 to +248°F)
6. Intake air temperature between -40 to +80°C (-40 to +176°F)

P0234

The ECM detects that the actual boost pressure is greater than the desired boost pressure for greater than 2 s.

P0299

The ECM detects that the actual boost pressure is less than the desired boost pressure for greater than 2.5 s.

1. DTCs P0234 and P0299 are Type B DTCs.
2. The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

DTCs P0234 and P0299 are Type B DTCs.

1. The charged air cooler is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the duct work, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
2. An excessively worn wastegate pivot pin may allow the wastegate to open slightly when commanded closed, which may result in P0299 being set.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE-23738-A Vacuum Pump

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

1. Ignition ON.
2. Verify DTC P0033, P0034, P0035, P0236, P0237, P0238, P0243, P0245, or P0246 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If none of the DTCs are set
3. Verify the scan tool BARO Sensor parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table for the current testing altitude. If the parameter is not within the range specified in the table. Refer to «DTC P2227-P2230»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the parameter is within the range specified in the table.
4. Verify the scan tool MAP Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi) . If the parameters are not within 3 kPa (0.4 psi). Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If the parameters are within 3 kPa (0.4 psi).
5. Verify the scan tool Boost Pressure Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi) . If the parameters are not within 3 kPa (0.4 psi). Refer to «DTC P0236»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If the parameters are within 3 kPa (0.4 psi).
6. Verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. If a click is not heard or felt Refer to Circuit/System Testing. If a click is heard or felt
7. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. If a series of clicks in increasing frequency are not heard or felt Refer to Circuit/System Testing. If a series of clicks in increasing frequency is heard or felt
8. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. If the parameters are not within 20 kPa (2.9 psi) Refer to Circuit/System Testing. If the parameter are within 20 kPa (2.9 psi)
9. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
10. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing If a DTC does not set
11. All OK

1. Verify the conditions listed below do not exist: Loose clamps, cracks or other damage in the air intake duct system Collapsed or restricted intake duct system Restricted air filter Any air flow restriction Any air leak between the turbocharger and the throttle body, including the charge air cooler assembly Splits, kinks or improper connections at the vacuum hoses Any vacuum leak Restricted, leaking or incorrect routing of hoses going to the components listed below: Turbocharger wastegate solenoid valve Turbocharger bypass solenoid valve Intake manifold and turbocharger vacuum reservoir on the bottom of intake manifold Turbocharger Turbocharger wastegate actuator Turbocharger bypass valve Missing, restricted or leaking exhaust components. Refer to «Restricted Exhaust»(/buick/encore/i-2012-2016/remont/exhaust/#engine-exhaust-system) Exhaust leak between the turbocharger and the exhaust manifold Restricted turbocharger oil supply line Loose or incorrect installation of any components If a condition exists Repair or replace the affected component as necessary. If none of the conditions exist
2. Ignition OFF, disconnect the turbocharger wastegate solenoid valve hose at the turbocharger and apply 51 kPa (15 inches Hg) of vacuum to the hose with the GE 23738-A . Ignition ON.
3. Verify the pressure decreases to 0 kPa (0 inches Hg) when commanding the Turbocharger Wastegate Solenoid Valve to 15 % with a scan tool. If the pressure does not decrease to 0 kPa (0 inches Hg) Test or replace the Q42 Turbocharger Wastegate Solenoid Valve If the pressure decreases to 0 kPa (0 inches Hg)
4. Connect the turbocharger wastegate solenoid valve hose to the turbocharger.
5. Disconnect the wastegate solenoid valve hose from the turbocharger wastegate actuator and connect the exhaust/pressure port of the GE 23738-A , or a suitable hand pressure pump, to the actuator.
6. Verify the wastegate actuator rod moves when applying pressure to the actuator. If the actuator does not move Replace the turbocharger If the actuator moves
7. Disconnect the Q40 Turbocharger Bypass Solenoid Valve vacuum supply hose at the intake manifold.
8. Connect the GE 23738-A to the manifold.
9. Engine Idling, verify the vacuum gauge displays between 45-67 kPa (13-20 inches Hg) of vacuum. If not within the specified range Repair the vacuum source. If within the specified range
10. Ignition OFF, disconnect the vacuum hose at the turbocharger vacuum reservoir.
11. Connect the GE 23738-A to the vacuum reservoir and apply 34 kPa (10 inches Hg) of vacuum.
12. Verify the reservoir holds vacuum for at least 10 s. If the vacuum is not held for at least 10 s Replace the intake manifold If the vacuum is held for at least 10 s
13. Connect the vacuum hose to the reservoir.
14. Disconnect the vacuum hose at the Q40 Turbocharger Bypass Solenoid Valve and connect the GE 23738-A to the hose.
15. Engine idling, command the Turbocharger Bypass Solenoid Valve ON and OFF with a scan tool.
16. Verify the vacuum toggles between 0 kPa (0 inches Hg) to greater than 45 kPa (13 inches Hg). If not within the specified range Test or replace the Q40 Turbocharger Bypass Solenoid Valve If within the specified range
17. Connect any hoses that were disconnected during previous steps.
18. Verify the conditions listed below do not exist with the turbocharger assembly. Refer to «Turbocharger Cleaning and Inspection»(ref-614552-S31463238552014050700000) Worn or damaged wastegate pivot pin Cracked, damaged or worn turbine blades Restricted wastegate, turbine, ports or passages Foreign material Damaged or restricted bypass valve assembly. If a condition exists Repair or replace the turbocharger as necessary If none of the conditions exist
19. Replace the turbocharger.

Static Test

1. Ignition OFF, disconnect the harness connector at the appropriate solenoid Valve.
2. Test for 20-27 ohms between terminal 1 and terminal 2 of the solenoid valve. If not between 20-27 ohms Replace the solenoid Valve. If between 20-27 ohms
3. All OK

Dynamic Test

1. Install a 10 A fused jumper wire between the Ignition terminal 2 and 12 V. Install a jumper wire between the control terminal 1 and ground.
2. Verify the solenoid clicks. If the solenoid does not click Replace the solenoid Valve. If the solenoid clicks
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Charge Air Bypass Regulator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Intake Manifold Replacement»(ref-614552-S22212432202014050700000)
3. «Turbocharger Replacement»(ref-614552-S20998096812014050700000)
4. «Turbocharger Wastegate Regulator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
5. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, Intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

1. DTC P0096, P0097, P0098, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0128, P0237, P0238, P0335, P0336, P2227, P2228, P2229, or P2230 is not active.
2. Engine speed is between 400-7,000 RPM.
3. Engine Coolant Temperature (ECT) is between -7 to +125°C (19.4-257°F).
4. Intake Air Temperature (IAT) is between -20 to +125°C (-4 to +257°F).
5. The DTC runs continuously when the above conditions have been met. OR
6. DTC P0106, P0107, P0108, P0237, P0238, P2227, P2228, P2229, P2230, or P2610 s not active.
7. DTC P0107, P0108, P0237, P0238, P2228, or P2229 is not pending.
8. Ignition is ON.
9. Engine is OFF
10. The time between current ignition cycle and the last time the engine was running is greater than 6 s.
11. The DTC runs continuously when the above conditions have been met.

1. The ECM detects that various combinations of Turbocharger Intake Flow Rationality Diagnostic Failure models, derived from engine speed, the BARO sensor, the MAF sensor, the MAP sensor, the throttle position sensor and the turbocharger boost pressure sensor have failed when the engine is running. OR
2. The ECM detects that the boost pressure sensor signal is less than 50 kPa (7.3 psi) or greater than 115 kPa (16.7 psi) when the ignition is ON and the engine is NOT rotating.

1. DTC P0236 is a Type B DTC.
2. The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

DTC P0236 is a Type B DTC.

1. The charge air cooler is connected to the turbocharger and to the throttle body by flexible duct work that requires the use of special high torque fastening clamps. These clamps cannot be substituted. In order to prevent any type of air leak when servicing the duct work, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
2. Use a smoke generating device or a solution of dish soap and water in a spray bottle to pinpoint any suspected air leaks in the induction system and in the charge air cooler assembly.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC P0641 is not set. If the DTC is set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the DTC is not set
2. If you were sent here from DTC P0068, P0101, P0106, P0121, or P1101, refer to Circuit/System Testing.
3. Ignition ON.
4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%. 90% or greater Refer to «Throttle Body Inspection and Cleaning»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__throttle-body-inspection-and-cleaning) . If less than 90%
5. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool. If Disagree Refer to «DTC P0121-P0123, P0222, P0223, or P2135»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If Agree
6. Verify the scan tool BARO parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table, for the current vehicle testing altitude. BARO is not in range Refer to «DTC P2227-P2230»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . BARO is within range
7. Verify the scan tool MAP Sensor pressure and BARO parameters are within 3 kPa (0.4 psi) . The parameters are not within 3 kPa (0.4 psi). Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . The parameters are within 3 kPa (0.4 psi).
8. Engine idling.
9. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input. If not between 26-52 kPa (3.8-7.5 psi) or does not change Refer to «DTC P0106»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If between 26-52 kPa (3.8-7.5 psi) and changes
10. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below. Engine idling Perform the scan tool snapshot function. Increase the engine speed slowly to 3,000 RPM and then back to idle. Exit from the scan tool snapshot and review the data. Observe the MAF Sensor parameter frame by frame with a scan tool. The MAF Sensor parameter does not change smoothly and gradually Refer to «DTC P0101»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . The MAF Sensor parameter changes smoothly and gradually
11. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi) . The parameters are not within 3 kPa (0.4 psi). Refer to Circuit/System Testing The parameters are within 3 kPa (0.4 psi).
12. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. The parameters are not within 20 kPa (2.9 psi) Refer to Circuit/System Testing. The parameters are within 20 kPa (2.9 psi)
13. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
14. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing. If a DTC does not set
15. All OK.

1. Verify that DTC P0237 or P0238 is not set. If a DTC is set Refer to «DTC P0237 or P0238»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0010-to-dtc-p0326) . If none of the DTCs are set
2. Verify the conditions listed below do not exist: Loose clamps, cracks, or other damage in the air intake duct system Collapsed or restricted air intake duct system Restricted air filter Splits, kinks or improper connections at the vacuum hoses Missing, restricted or leaking exhaust components - Refer to «Symptoms - Engine Exhaust»(/buick/encore/i-2012-2016/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . Vacuum leaks at the intake manifold and throttle body If a condition exists Repair as necessary. If none of the conditions exist
3. Replace the B111B turbocharger boost/intake air temperature sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Intake Air Pressure and Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement.
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Boost Pressure Sensor

The boost pressure sensor is integrated with the turbocharger boost/intake air temperature sensor. The boost pressure sensor measures the range of pressures between the turbocharger and the throttle body. The sensor used on this engine is a three atmosphere sensor. Pressure in this portion of the induction system is affected by engine speed, throttle opening, turbocharger boost pressure, intake air temperature (IAT), barometric pressure (BARO), and the efficiency of the charge air cooler.

The sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes. Under normal operation the greatest pressure that can exist in this portion of the induction system at ignition ON, engine OFF is equal to the BARO. When the engine is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa (34.8 psi). The pressure is equal to the BARO when the engine is idling or decelerating.

1. Ignition is ON or the engine is running.
2. The DTCs run continuously when the above conditions have been met.

P0237

The ECM detects that the boost pressure sensor voltage is less than 1.0 V for greater than 5 s.

P0238

The ECM detects that the boost pressure sensor voltage is greater than 4.7 V for greater than 5 s.

1. DTCs P0237 and P0238 are Type B DTCs.
2. The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.

DTCs P0237 and P0238 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC P0641 is not set. If the DTC is set Refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the DTC is not set
2. Verify the scan tool BARO parameter is within the range specified in the «Altitude Versus Barometric Pressure»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__altitude-versus-barometric-pressure) table, for the current vehicle testing altitude. BARO is not in range. Refer to «DTC P2227-P2230»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . BARO is within range.
3. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi). The parameters are not within 3 kPa (0.4 psi). Refer to Circuit/System Testing. The parameters are within 3 kPa (0.4 psi).
4. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift. The parameters are not within 20 kPa (2.9 psi). Refer to Circuit/System Testing. The parameters are within 20 kPa (2.9 psi).
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
6. Verify a DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
7. All OK.

1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the B111B turbocharger boost/intake air temperature sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 1 and ground. If 5 ohms or greater Ignition OFF, disconnect the X1 harness connector at the K20 engine control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If less than 5 ohms
3. Ignition ON.
4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than 4.8 V Ignition OFF, disconnect the X1 harness connector at the K20 engine control module. Test for infinite resistance between the 5 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 5 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged. If greater than 5.2 V Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON. Test for less than 1 V between the 5 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If between 4.8-5.2 V
5. Verify the scan tool Boost Pressure Sensor voltage parameter is less than 0.2 V. If 0.2 V or greater Ignition OFF, disconnect the X1 harness connector at the K20 engine control module, ignition ON. Test for less than 1 V between the signal circuit terminal 4 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If less than 0.2 V
6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3.
7. Verify the scan tool Boost Pressure Sensor voltage parameter is greater than 4.5 V. If 4.5 V or less Ignition OFF, remove the jumper wire, disconnect the X1 harness connector at the K20 engine control module. Test for infinite resistance between the signal circuit terminal 4 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open or high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If greater than 4.5 V
8. Test or replace the B111B turbocharger boost/intake air temperature sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Intake Air Pressure and Temperature Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions) for turbocharger boost/intake air temperature sensor replacement
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming, and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The BorgWarner™ dual scroll turbocharger incorporates a wastegate that is controlled by a pressure differential, that is determined by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, in order to regulate the pressure ratio of the compressor. A charge air bypass valve also controlled by the ECM by utilizing a remotely mounted solenoid is integrated into the bypass valve to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. When the bypass valve is open during closed throttle deceleration conditions, the bypass valve allows the air to recirculate in the turbocharger and maintain compressor speed. Within a calibrated range during the closed throttle event, or upon a wide open throttle command the bypass valve will then close to optimize turbo response. The turbocharger wastegate actuator has the following circuits

1. Ignition voltage
2. Turbocharger wastegate solenoid control

At idle the turbocharger wastegate solenoid parameter is commanded to 0% by the ECM. When the engine load and RPM first increases under a wide open throttle, the turbocharger wastegate solenoid parameter should briefly be commanded as great as 90-100%. When the proper level of boost pressure is attained, the ECM will decrease the PWM of the solenoid to a range of 65-85%. As soon as the throttle closes the ECM will command the turbocharger wastegate solenoid parameter back to 0%, in order to allow the turbocharger waste gate to open from the air pressure ratio differential, there by reducing the speed of the turbine.

1. Ignition ON or engine running.
2. The battery voltage is between 11-32 V.
3. This DTC runs continuously within the enabling conditions.

The ECM detects an open, a short to ground, or a short to voltage on the turbocharger wastegate solenoid control circuit for greater than 0.5 s.

DTCs P0243, P0245 and P0246 are Type B DTCs.

DTCs P0243, P0245 and P0246 are Type B DTCs.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Turbocharger System Description

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON
2. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. If a series of clicks in increasing frequency are not heard or felt Refer to Circuit/System Testing. If a series of clicks in increasing frequency is heard or felt
3. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Wastegate Solenoid Valve between 15-100 % with a scan tool. Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status If Malfunction is displayed Refer to Circuit/System Testing. If Malfunction is not displayed
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify a DTC does not set. If a DTC sets Refer to Circuit/System Testing If a DTC does not set
6. All OK

1. Ignition OFF, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve. Ignition ON.
2. Verify a test lamp illuminates between the ignition circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF, remove the test lamp. Test for less than 2 ohms in the ignition circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF, remove the test lamp. NOTE: An internal short in any component supplied by the fuse may cause the fuse to open and set a DTC when the component is activated. Test for infinite resistance between the ignition circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, test all components connected to the ignition voltage circuit for a short and replace as necessary. If the test lamp illuminates
3. Remove the test lamp.
4. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status parameter is OK. If OK is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K20 Engine Control Module. If OK is displayed
5. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status parameter is OK. If OK is not displayed Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 Engine Control Module. If OK is displayed
6. Install a 3 A fused jumper wire between the control circuit terminal 1 and the ignition circuit terminal 2.
7. Verify the scan tool Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status parameter is Malfunction. If Malfunction is not displayed Ignition OFF, remove the jumper wire, disconnect the harness connector at the K20 Engine Control Module. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 Engine Control Module. If Malfunction is displayed
8. Test or replace the Q42 Turbocharger Wastegate Solenoid Valve.

Static Test

1. Ignition OFF, disconnect the harness connector at the Q42 Turbocharger Wastegate Solenoid Valve.
2. Test for 20-27 ohms between terminal 1 and terminal 2 of the solenoid valve. If not between 20-27 ohms Replace the Q42 Turbocharger Wastegate Solenoid Valve. If between 20-27 ohms
3. All OK

Dynamic Test

1. Install a 10 A fused jumper wire between the Ignition terminal 2 and 12 V. Install a jumper wire between the control terminal 1 and ground.
2. Verify the solenoid clicks. If the solenoid does not click Replace the Q42 Turbocharger Wastegate Solenoid Valve. If the solenoid clicks
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Turbocharger Wastegate Regulator Solenoid Valve Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) supplies voltage to the chassis control module when the ECM detects that the ignition is on. The voltage from the ECM to the chassis control module remains active for 2 seconds, unless the engine is in crank or run. While this voltage is being received, the chassis control module supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel line pressure.

The ignition is ON.

The serial data message from the ECM to the chassis control module does not agree with the state of the control enable voltage signal supplied from the ECM to the chassis control module for more than 2 seconds.

DTC P025A is a Type A DTC.

DTC P025A is a Type A DTC.

Beginning in the 2014 model year the K27 Fuel Pump Control Module (FPCM) will now be called the chassis control module (CCM). The component code for the chassis control module will be K38. The chassis control module name will be used in Service Information, the Global Diagnostic System and the Service Programming System.

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Fuel System Description (LUJ) , Fuel System Description (LUV)

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Note. Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank. Clear the DTC, and start and run the engine. Verify that the DTC resets before proceeding with the circuit system testing. If the DTC does not reset, refer to diagnostic aids.

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the K38 Chassis Control Module, ignition ON.
2. Connect a test lamp between the control circuit terminal 20 and ground.
3. Verify the test lamp turns ON and OFF when commanding the fuel pump ON and OFF using the scan tool ECM fuel pump enable control function. If the test lamp is always OFF Ignition OFF, disconnect the harness connector at the K20 engine control module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K20 engine control module. If the test lamp is always ON Ignition OFF, disconnect the harness connector at the K20 engine control module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K20 engine control module. If the test lamp turns ON and OFF
4. Test or replace the K38 Chassis Control Module.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for ECM or chassis control module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The engine control module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when a engine cylinder misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM can detect individual cylinder misfire events.

Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. DTCs P0301 through P0304 correspond to cylinders 1 through 4. When the ECM detects that a specific cylinder is misfiring, a DTC for the that cylinder will set and the corresponding fuel injector is disabled. The ECM will re-enable the fuel injector after 3 crankshaft revolutions if equipped with an automatic transmission or 6 crankshaft revolutions if equipped with a manual transmission to determine if the misfire is still present. If the misfire is still present, the ECM will disable the fuel injector again after 3 crankshaft revolutions if equipped with an automatic transmission or 6 crankshaft revolutions if equipped with a manual transmission repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM.

1. DTCs P0016, P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0222, P0223, P0315, P0335, P0336, P0502, P0651, and P2135 are not set.
2. The engine speed is greater than 1000 RPM.
3. The crankshaft and camshaft are syncronized.
4. The ignition voltage is between 11-18 V.
5. The engine coolant temperature (ECT) sensor is between -7 to +125°C (+19 to +257°F).
6. The A/C compressor clutch is not changing states.
7. The fuel tank level is greater than 15%.
8. The ECM is not in fuel cut-off or deceleration fuel cut-off mode.
9. The ECM is not receiving a rough road signal.
10. The throttle angle is steady within 5%.
11. The throttle angle is greater than 3% when the vehicle speed is greater than 5 km/h (3 MPH).
12. The transmission is not changing gears.
13. The antilock brake system (ABS) and the traction control system , if equipped, is not active.

The DTCs run continuously when the above conditions are met.

P0300

The ECM detects a crankshaft rotation speed variation indicating a misfire rate sufficient to cause emissions levels to exceed a predetermined value or a misfire rate high enough to cause catalyst damage.

P0301, P0302, P0303, or P0304

The ECM detects a crankshaft rotation speed variation indicating a single cylinder misfire rate sufficient to cause emissions levels to exceed mandated standards.

1. DTCs P0300, P0301, P0302, P0303 and P0304 are Type B DTCs.
2. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present.

DTCs P0300, P0301, P0302, P0303 and P0304 are Type B DTCs.

1. A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources: A tire or wheel that is out of round or out of balance Variable thickness brake rotors An unbalanced drive shaft Certain rough road conditions Transmission operation Cracked Spark Plug Insulators Broken or weak valve spring A damaged or defective accessory drive component or belt; remove the belt and safely operate the engine to evaluate if misfire counts go away.
2. High resistance in the circuits of the injectors may set a misfire DTC without setting an injector DTC. Test the injector circuits of the affected cylinder(s) for a high resistance if you suspect a condition.
3. If the condition is intermittent, observing the scan tool IC Circuit Test and Fuel Injector Circuit Test Status parameters may help isolate the condition. The circuit test status parameters will change from OK or Not Run to Fault/Malfunction if a condition exists.
4. A condition in the heated O2 sensor (HO2S) heater control circuits may set a DTC P0300.

Description and Operation

1. «Electronic Ignition System Description»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-description-and-operation)
2. «Fuel System Description (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-description-and-operation) , «Fuel System Description (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-description-and-operation)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL 26792 HEI Spark Tester

For equivalent regional tools, refer to Special Tools (Diagnostic Tools) .

Note. Before starting the engine, review the freeze frame failure records data to determine if the misfire sets during a cold start or at operating temperature. If there is a cold start condition and the engine is started, the engine will need to be cooled down before the next attempt to start the engine within the fail conditions.

1. Engine Running at normal operating temperature.
2. Verify there is no abnormal engine noise. If abnormal engine noise is present Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) . If abnormal engine noise is not present
3. Perform the scan tool «Crankshaft Position System Variation Learn»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__crankshaft-position-system-variation-learn) procedure.
4. Verify no DTCs are set. If any DTCs other than P0300-P0304 are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) . If DTC P0300-P0304 is set Refer to Circuit/System Testing. If no DTCs are set
5. Verify the scan tool Cylinder 1-4 Current Misfire Counter parameters do not increment. If increments Refer to Circuit/System Testing. If does not increment
6. Engine Running, perform the Cylinder Power Balance Test with a scan tool.
7. Verify the engine speed changes when each injector is disabled and then enabled. If engine speed does not change Refer to Circuit/System Testing. If engine speed does change
8. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
9. Verify the DTC does not set. If the DTC sets Refer to Circuit/System Testing. If the DTC does not set
10. All OK.

1. Verify none of the following conditions listed below exist: Damage, carbon tracking, or fluid intrusion of the spark plug boots and/or spark plugs Vacuum hose splits, kinks, and incorrect connections Engine vacuum leaks Crankcase ventilation system for vacuum leaks Fuel pressure that is too low or too high. Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Contaminated fuel. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . Exhaust system restrictions If a condition exists Repair or replace as necessary. If no conditions exist
2. Ignition OFF, remove the K35 Ignition Coil Module from the spark plugs and connect the EL 26792 HEI Spark Tester to the appropriate spark plug boot, engine Cranking.
3. Verify the spark output. If no output or the output is weak Refer to «Electronic Ignition System Diagnosis»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . If the output is good
4. Ignition OFF.
5. Verify the conditions listed below. Refer to «Ignition System Specifications»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-specifications__ignition-system-specifications) . The correct spark plug type The correct spark plug gap The correct spark plug torque If a condition exists Repair or replace as necessary. If no conditions exist
6. Exchange the suspect spark plug with another cylinder that is operating correctly.
7. Engine Running.
8. Verify the scan tool Cylinder 1-4 Current Misfire Counter does not increment for the cylinder where the suspect spark plug was installed. If increments Replace the spark plug. If does not increment
9. Test or inspect for the conditions listed below: A lean or rich Q17 Fuel Injector-Refer to «Fuel System Diagnosis (LUJ)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) , «Fuel System Diagnosis (LUV)»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) .

1. «Ignition Coil Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__ignition-coil-replacement)
2. «Spark Plug Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)

1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 60 s.
5. If the repair was related to a DTC, duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
6. Engine Running, verify the scan tool Cylinder 1-4 Current Misfire Counter parameters do not increment. If the misfire counter parameters increment, a misfire condition still exists.
7. To verify that the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair Verification for DTC P0420. Refer to «DTC P0420»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) .

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The crankshaft position sensor system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the crankshaft position sensor. The calculated error allows the engine control module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load.

The crankshaft position sensor system variation compensating values are stored in ECM memory after a learn procedure has been performed. If the actual crankshaft position sensor variation is not within the crankshaft position sensor system variation compensating values stored in the ECM, DTC P0300 may set.

If the crankshaft position sensor system variation values are not stored in the ECM memory, DTC P0315 sets.

1. The engine is running.
2. The DTC runs continuously.

The crankshaft position sensor system variation values are not stored in the ECM memory.

DTC P0315 is a Type A code.

DTC P0315 is a Type A code.

This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

1. «Circuit Testing»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/encore/i-2012-2016/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Note. The crankshaft position sensor system variation learn procedure may have to be repeated up to 5 times before the procedure is learned.

1. Perform the crankshaft position variation learn procedure. Refer to «Crankshaft Position System Variation Learn»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions__crankshaft-position-system-variation-learn) .
2. If the crankshaft position variation learn procedure cannot be performed successfully, inspect for the following conditions: Any worn crankshaft main bearings A damaged or misaligned reluctor wheel Excessive crankshaft runout Interference in the signal circuit of the B26 Crankshaft Position Sensor The ignition switch is left in the ON position, until the battery is discharged An ECM power disconnect, with the ignition ON, that may have erased the crankshaft position sensor system variation values and set DTC P0315. Any debris between the crankshaft position sensor and the reluctor wheel If the ECM is still unable to complete the learn procedure, replace the K20 Engine Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References

1. Perform the «Diagnostic System Check - Vehicle»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/encore/i-2012-2016/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The knock sensor enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The knock sensor produces an alternating current (AC) voltage signal that varies depending on the vibration level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the knock sensor signal. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges and monitors the normal knock sensor signal. The ECM monitors the internal knock sensor processor test circuits which perform the open circuit diagnostic.

P0324 or P0326

1. Engine speed is between 400 and 8,500 RPM.
2. Engine is running for greater than 2 s.
3. The engine coolant temperature (ECT) is warmer than -40°C (-40°F).
4. The intake air temperature (IAT) sensor 1 is warmer than -40°C (-40°F). AND
5. Engine speed is 400 RPM or greater for 200 or more cumulative revolutions. OR
6. Engine speed is 8,500 RPM or greater.

P06B6

1. Engine speed is between 500 and 5,500 RPM for 100 or more cumulative revolutions.
2. Engine is running for greater than 2 s.

The DTCs run continuously when the above conditions are met.

P0324

The ECM detects that the knock sensor signal performance is out of the normal calibrated range due to excessive engine knock on a per cylinder basis.

P0326

The ECM detects that the knock sensor signal performance is out of the normal calibrated range due to a low signal level.

P06B6

The ECM has detected a fault in the knock sensor processor open circuit diagnostic internal test circuit.

1. DTCs P0324, P0326, and P06B6, are Type B DTCs.
2. The ignition timing is retarded to reduce the potential of engine damaging spark knock.

DTCs P0324, P0326, and P06B6 are Type B DTCs.

Description and Operation

Electronic Ignition System Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

1. Engine Running
2. Verify DTC P0325, P0327, P0328 or P06B6 is not set. IF DTC P0325, P0327, or P0328 is set with P06B6 Refer to «DTC P0325, P0327, or P0328»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-dtc-p0325-to-dtc-p2635-and-diagnostic-information-and-procedures) . If only DTC P06B6 is set Replace the K20 Engine Control Module. If none of the DTCs are set
3. Ignition OFF.
4. Verify none of the conditions listed below exist: Physical damage. Incorrect B68 Knock Sensor installation. Refer to «Fastener Tightening Specifications»(ref-614552-S14742100402014050700000) . B68 Knock Sensor and engine mounting surface burrs, casting flash, and foreign material. Close proximity of hoses, brackets, and engine wiring. Loose brackets. Loose or broken accessory drive belts, brackets, components. An engine mechanical condition. Refer to «Symptoms - Engine Mechanical»(ref-614552-S10218607212014050700000) . If a condition exists Repair or replace as necessary. If no conditions exist
5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. If the DTC sets Test or replace the B68 Knock Sensor. If the DTC does not set
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Knock Sensor Replacement»(/buick/encore/i-2012-2016/remont/testing-diagnostics/#engine-controls-and-fuel-14l-luj-luv-repair-instructions)
2. «Control Module References»(/buick/encore/i-2012-2016/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics (Encore)
• WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE
• Powertrain Component Views
• Camshaft Actuator System Description
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Trouble Code (DTC) List - Vehicle
• Diagnostic Repair Verification
• Camshaft Position Actuator Solenoid Valve Replacement
• DTC P0641, P0651, P0697, or P06A3 (ECM)
• Throttle Body Inspection and Cleaning
• Altitude Versus Barometric Pressure
• Symptoms - Engine Exhaust
• Special Tools (Diagnostic Tools)
• Temperature Versus Resistance - Intake Air Temperature Sensor (Bosch Sensor)
• Checking Aftermarket Accessories
• Temperature Versus Resistance
• Loss of Coolant
• Cooling System Draining and Filling
• Fuel Tank Fuel Pump Module Replacement (AWD)
• Restricted Exhaust
• Crankshaft Position System Variation Learn
• Ignition System Specifications
• Ignition Coil Replacement
• Battery Inspection/Test
• DTC P0121-P0123, P0222, P0223, or P2135