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Engine Controls/fuel - 2.0l - DTC p0010 to DTC p0336 Buick Regal V

Testing & Diagnostics ~36441 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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 between 11-32 V.
  2. The ECM has commanded the camshaft position actuator solenoid valve ON.
  3. DTCs P0010 and P0013 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 seconds.

Action Taken When the DTC Sets

DTCs P0010 and P0013 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0010 and P0013 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 too circuit status parameters for the component. The circuit 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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0335, P0336, P0340, and P0341 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Engine idling, command the Camshaft Position Actuator to 10 degrees while observing the following control circuit status parameters with a scan tool: The Camshaft Position Actuator Solenoid Valve Control Circuit Open Test Status The Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Test Status The Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Each parameter should display OK or Not Run
  3. With the engine at normal operating temperature, raise the engine speed to 2,000 RPM for 10 s. DTC P0010 or P0013 should not set.
  4. 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.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate Q6 camshaft position actuator solenoid valve .
  2. Ignition OFF for 1 minute, test for less than 5 ohms between the low reference circuit terminal B and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal A and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Connect the DMM black lead to the control circuit terminal A. 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, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 ECM.
  5. If all circuits/connections test normal, test or replace the appropriate Q6 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 5-13 ohms between the control terminal A and the low reference circuit terminal B of the Q6 camshaft position actuator solenoid valve . If not within the specified range, replace the Q6 camshaft position actuator solenoid valve .
  3. Test for infinite resistance between each terminal and the Q6 camshaft position actuator solenoid valve housing. If not the specified value, replace the Q6 camshaft position actuator solenoid valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  1. «CAMSHAFT POSITION SENSOR REPLACEMENT - INTAKE»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «CAMSHAFT POSITION ACTUATOR SOLENOID VALVE REPLACEMENT (EXHAUST)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  3. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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 signal from the ECM is pulse width modulated (PWM). The ECM controls the camshaft position actuator solenoid duty cycle by controlling the amount of solenoid ON time. The camshaft position actuator solenoid controls the advance or the retard of each camshaft. The camshaft position actuator solenoid controls the oil flow that applies the pressure to advance or retard the camshafts.

  1. DTC P0010, P0013, P0016, P0017, P0335, P0336, P0340, P0341, P0365, or P0366 is not set.
  2. The ignition voltage is between 11-18 V.
  3. The engine is operating.
  4. The desire camshaft position is not changing greater than 4.5 degrees.
  5. The desired and actual camshaft position actuator is commanded between 5-25 degrees.
  6. DTCs P0011 and P0014 run continuously once the above conditions are met.
  1. The ECM detects the difference between the desired camshaft position angle and the actual camshaft position angle is greater than 5 degrees.
  2. The condition exists for greater 10 seconds.

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 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 chain can cause this DTC to set.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the scan tool DTC information. Verify that none of the following DTCs are set. DTC P0016, P0017, P0335, P0336, P0340, P0341, P0365, P0366, P1516, P2101, or P2119. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Engine idling, command the appropriate Camshaft Position Actuator from 0 degrees to 20 degrees and back to zero while observing the appropriate scan tool Camshaft Position Variance parameters. The Camshaft Position Variance should be less than 2 degrees in each of the commanded states.
  3. 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 appropriate Q6 camshaft position actuator solenoid valve.
  2. Ignition OFF for 1 minute, test for less than 5 ohms between the low reference circuit terminal B and ground. If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal A and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, command the appropriate Camshaft Position Actuator Solenoid Valve from OFF to ON with a scan tool while observing the appropriate scan tool Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status. the value should toggle between OK and Not run in each of the commanded states. If the parameter does not correspond to the specified values, test the control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 ECM.
  5. Remove the camshaft position actuator solenoid valve . Inspect the camshaft position actuator solenoid valve and mounting area for the following conditions: For a torn, restricted, mis-positioned, or missing screens at the camshaft position actuator solenoid valve For engine oil leaks between the oil sealing lands of the camshaft position actuator solenoid valve. Inspect the lands of the camshaft position actuator solenoid valve for nicks For oil seepage at the camshaft position actuator solenoid valve connector If a condition is found, replace Q6 camshaft position actuator solenoid valve.
  6. Ignition OFF, swap the appropriate camshaft position actuator solenoid valve with a camshaft position actuator solenoid valve that is operating correctly.
  7. Engine idling. Command the appropriate Camshaft Position Actuator from 0 degrees to 20 degrees and back to zero while observing the appropriate scan tool Camshaft Position Variance parameters. The Camshaft Position Variance should be less than 2 degrees in each of the commanded states. If greater than the specified value, replace the mechanical camshaft position actuator.
  8. If all circuits/connections test normal, 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 5-9 ohms between the control terminal A and the low reference circuit terminal B of the Q6 camshaft position actuator solenoid valve . If not within the specified range, replace the Q6 camshaft position actuator solenoid valve .
  3. Test for infinite resistance between each terminal and the Q6 camshaft position actuator solenoid valve housing. If not the specified value, replace the Q6 camshaft position actuator solenoid valve.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Camshaft Position Exhaust Actuator Replacement»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-on-vehicle)
  2. «Camshaft Position Intake Actuator Replacement»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-on-vehicle)
  3. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/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 (CKP) sensor and the intake and exhaust camshaft position (CMP) sensor information to monitor the correlation between the crankshaft, intake, and exhaust camshaft position.

  1. DTC P0335, P0336, P0340, P0341, P0365, P0366, P0641, and P0651 are not set.
  2. The engine is cranking or running.
  3. The crankshaft and camshaft position signals are synchronized.
  4. The camshaft position actuator is in the parked position.
  5. DTC P0016 and P0017 run continuously once the above conditions are met.

The ECM detects a camshaft that is greater than 9 degrees advanced, or 12 degrees retarded, in relationship to the crankshaft.

DTCs P0016 and P0017 are Type B DTCs.

DTCs P0016 and P0017 are Type B DTCs.

  1. Inspect the engine for any recent engine mechanical repairs. An incorrectly installed timing chain can cause this DTC to set.
  2. A mechanical camshaft actuator that is in the full advance or retard position can cause this DTC to set.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the DTC information with a scan tool. DTC P0010, P0013, P0335, P0336, P0340, P0341, P0365, or P0366 should not be set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Idle the engine at normal operating temperature. DTCs P0016 or P0017 should not set. If a DTC sets, inspect for the following and repair as necessary: The correct installation of the camshaft position sensors The correct installation of the crankshaft sensor A timing chain tensioner condition An incorrectly installed timing chain Excessive play in the timing chain A mechanical cam actuator that is stuck in the full advance or retard position. A timing chain that jumped teeth
  3. 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.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Camshaft Timing Chain Adjustment»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-on-vehicle)
  2. «Timing Chain Tensioner Replacement»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-on-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
HO2S High SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P1133, P2A00
HO2S Low SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P1133, P2A00
HO2S Heater Voltage SupplyP0030, P0036, P0132, P0135, P0138, P0141, *P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0690P0135, P0141
HO2S Heater ControlP0030, P0036, P0053, P0054, P0135, P0141P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0135, P0141
* Opens fuse

Circuit Description

The heated oxygen sensor (HO2S) heater reduces the time required for the oxygen sensor to reach operating temperature and maintains the operating temperature during extended idle periods. When the ignition is turned to the ON position, ignition voltage is supplied directly to the sensor heater. The engine control module (ECM) controls the heater operation by first modulating the control circuit to ground when the sensors are cold. This prevents the possibility of thermal shock to the sensor, from condensation build-up on the sensor, by controlling the sensors rate of heating. After a predetermined amount of time, the ECM commands the heaters ON continuously. Once the sensor reaches operating temperature, the ECM may modulate the heater control circuit to ground, to maintain a desired temperature.

The ECM controls the heater by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled-up to voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage.

P0030 or P0036

  1. The ignition voltage is between 11-32 V.
  2. The engine speed is greater than 400 RPM.
  3. The DTCs run continuously once the above conditions are met for 10 s.

P0053 or P0054

  1. DTCs P0112, P0113, P0117, P0118, P0128, P2610 are not set.
  2. The engine is running.
  3. Ignition voltage is less than 32 V.
  4. The ignition is OFF for more than 8 h.
  5. The Engine Coolant Temperature (ECT) Sensor parameter is between -30 to +45°C (-22 to +113°F) at engine start-up.
  6. DTCs P0053 and P0054 run once per drive cycle when the above conditions are met.

P0135, P0141

  1. DTCs P0116, P0117, P0118, P0119, P0128 are not set.
  2. The ignition voltage is between 10-32 V.
  3. DTCs P0135 and P0141 run twice per drive cycle when the above conditions are met for 2 minutes.

P0030 or P0036

  1. The ECM detects that the affected HO2S heater low control circuit voltage is not within a specified range.
  2. DTCs P0030 and P0036 set when the above condition is met.

P0053 or P0054

  1. The ECM detects that the affected HO2S heater low control circuit resistance is not within a specified range at engine start-up.
  2. DTCs P0053 and P0054 set within 1 s when the above condition is met.

P0135 or P0141

  1. The ECM detects that the affected HO2S heater current is greater than 2.5 A or less than 0.3 A.
  2. DTCs P0135 and P0141 set within 60 s when the above condition is met.

DTCs P0030, P0036, P0053, P0054, P0135, and P0141 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0030, P0036, 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 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.
  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 using the DMM 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

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine idling, command the appropriate B52 HO2S heater ON and OFF with a scan tool while observing the B52 HO2S Heater Circuit Test Status parameter. The parameter should display OK or Not Run.
  2. Engine idling at operating temperature, observe the scan tool B52 HO2S Heater parameter . The amperage should be within 0.2-1.5 A.
  3. Engine idling at operating temperature, move the related wiring and connectors while observing the B52 HO2S Heater parameter with a scan tool. The parameter should not change with movement. If movement affects the parameter, repair the appropriate harness or connector.
  4. 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 appropriate B52 HO2S.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground. If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B52 HO2S heater circuit fuse is open, test all components connected to the fuse and replace as necessary.
  3. Ignition ON, observe the appropriate scan tool HO2S Heater Control Open Circuit Test Status parameter. The parameter should display Malfunction. If not the specified value, test the heater control circuit terminal E for a short to ground, or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Connect a 3 A fused jumper wire between the heater control circuit terminal E and ground. Observe the appropriate scan tool HO2S Heater Control Circuit Low Voltage Test Status parameter. The parameter should transition from OK to Malfunction. If not the specified value, test the heater control circuit terminal E for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  5. Ignition OFF, connect a 10 A fused jumper wire between the control circuit terminal E and the ignition voltage circuit terminal D.
  6. Engine idling, observe the appropriate HO2S Control Circuit High Voltage Test Status parameter. The parameter should transition from Not Run to Malfunction. If not the specified value, test the control circuit and the ignition voltage circuit for high resistance. If the circuits test normal, replace the K20 ECM.
  7. If all circuits test normal, test or replace the appropriate B52 HO2S.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
  4. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition Voltage CircuitP0010, P0013, P0033, P0034, P0245P0033P0033, P0034
Turbocharger Bypass Valve Solenoid Control CircuitP0034P0033P0033P0035P0033

The BorgWarner™ dual-scroll turbocharger incorporates a wastegate that is controlled by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, to regulate the pressure ratio of the compressor. An ECM controlled compressor bypass valve, which uses a remotely mounted solenoid, is integrated into the unit to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. The bypass valve is open during closed throttle deceleration conditions to allow air to recirculate in the turbocharger and maintain compressor speed.

As engine load and RPM increase, the turbocharger bypass solenoid valve is commanded ON by the ECM. As soon as the throttle closes, the solenoid is commanded OFF to allow the bypass valve to open and allow the turbocharger air to recirculate to prevent compressor surging.

Conditions for Running the DTCs

  1. Ignition is ON or the engine is running.
  2. Battery voltage is between 11-32 V.
  3. The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTCs

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 10 s.

Action Taken When the DTCs Set

DTCs P0033, P0034, and P0035 are Type B DTCs.

Conditions for Clearing the MIL/DTCs

DTCs P0033, P0034, and P0035 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information.

  1. Engine running, command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. A click should be heard and felt.
  2. Command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool while observing the following control circuit status parameters: Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status Each parameter should toggle between OK and Not Run
  3. 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 Q40 turbocharger bypass valve solenoid.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 or A and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 or B and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  4. Connect a test lamp between the control circuit terminal 2 or B and the ignition circuit terminal 1 or A.
  5. Command the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool. The test lamp should turn ON and OFF. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module. If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If the circuits test normal, test or replace the Q40 turbocharger bypass valve solenoid.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turbocharger Control Solenoid Valve Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for turbocharger bypass valve solenoid replacement.
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/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, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 is not set
  2. The engine speed is between 575-6,600 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.

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

  1. DTC P0068 is a type A DTC.
  2. DTC P1101 is a type B DTC.

Conditions for Clearing the DTCs

  1. DTC P0068 is a type A DTC.
  2. DTC P1101 is a type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify none of the following conditions exist: The air intake duct system for loose clamps, cracks, or other damage The air intake duct system for being collapsed or restricted The B75 mass airflow sensor is installed correctly. Restricted air filter The Q38 throttle body for dirt, debris, and coking. Also, throttle body blade or shaft damage. Refer to «Throttle Body Cleaning»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions__throttle-body-cleaning) for further diagnosis. A damaged Q38 throttle body blade or shaft Splits, kinks, or improper connections at the vacuum hoses Missing, restricted, or leaking exhaust components-Refer to «Restricted Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system) . Vacuum leaks at the intake manifold and Q38 throttle body. If a condition exists, repair as necessary.
  2. Ignition ON, observe the diagnostic trouble code (DTC) information with a scan tool. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If any of the above DTCs are set, refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) for further diagnosis.
  3. Determine the current vehicle testing altitude. Compare the MAP Sensor pressure parameter to the reading in the «Altitude Versus Barometric Pressure»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__altitude-versus-barometric-pressure) table . The MAP sensor pressure parameter should be within the specified range indicated in the table. If the MAP sensor pressure is not within the range specified for your altitude, refer to «DTC P0106»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) for further diagnosis.
  4. Engine idling, observe the MAP Sensor kPa parameter. The reading should be between 26-52 kPa (3.8-7.5 psi). If not within the specified range, refer to «DTC P0106»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) for further diagnosis.
  5. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 1.8-5.5 g/s depending on the engine coolant temperature (ECT) and barometric (BARO) pressure.
  6. Use the scan tool snapshot function to take a snapshot of the engine data list while performing the actions listed below. Engine idling 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 g/s parameter frame by frame with a scan tool. The MAF Sensor g/s parameter should change smoothly and gradually as the engine speed is increased and then returned to idle. If the MAF Sensor g/s parameter does not change smoothly and gradually, refer to «DTC P0101»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) for further diagnosis.
  7. If all conditions test normal, test the engine for a mechanical condition. Refer to «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) for further diagnosis.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Air Cleaner Element Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Throttle Body Assembly Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground.

The high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

P0089, P228C, or P228D

  1. DTC P0016, P0017, P0090, P0091, P0092, P0096, P0097, P0098, P00C8, P00C9, P00CA, P0111, P0112, P0113, P0116, P0117, P0118, P0128, P0178, P0179, P0192, P0193, P0335, P0336, P0340, P0341, P0365, P0366, P0627, P0628, P0629, P1682, P2269 is not set.
  2. The ignition voltage is more than 11 V.
  3. The engine is running.
  4. The low side fuel pressure is more than 250 kPa (36 psi).
  5. The intake air temperature (IAT) is greater than -10°C (14°F).
  6. The barometric pressure (BARO) is greater than 70 kPa.
  7. The fuel temperature is between -10°C and 100°C (14°F and 212°F).
  8. The DTC runs continuously when the above conditions are met for 60 s.

P00C6

  1. DTC P0016, P0017, P0090, P0091, P0092, P0096, P0097, P0098, P00C8, P00C9, P00CA, P0111, P0112, P0113, P0116, P0117, P0118, P0128, P0178, P0179, P0192, P0193, P0335, P0336, P0340, P0341, P0365, P0366, P0627, P0628, P0629, P1682, P2269 is not set.
  2. The ignition voltage is more than 8 V.
  3. The engine coolant temperature is between -100 and +80°C (-148 and +176°F).
  4. The barometric pressure (BARO) is greater than 70 kPa.
  5. The intake air temperature (IAT) is greater than -10°C (14°F).
  6. The low side fuel pressure is more than 0 kPa (0 psi).
  7. The engine is not running.
  8. The DTC runs once for each engine start.

P0089

The high pressure fuel pump actuator command is greater than or equal to 132 ° or less than or equal to 0 °. The condition exists for greater than 5 s.

P00C6

The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.

P228C

The actual fuel rail pressure is 3 MPa (435 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.

P228D

The actual fuel rail pressure is 3 MPa (435 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.

  1. DTCs P0089 and P00C6 are Type B DTCs.
  2. DTCs P228C and P228D are Type A DTCs.
  3. A message center or an indicator displays Reduced Engine Power.
  1. DTCs P0089 and P00C6 are Type B DTCs.
  2. DTCs P228C and P228D are Type A DTCs.
  1. A restricted fuel feed pipe between the fuel feed pipe fuel pressure sensor and the high pressure fuel pump may set a DTC.
  2. A condition with the fuel tank fuel pump module or the fuel pump flow control module may set a DTC.
  3. A skewed fuel rail pressure sensor, or an intermittent condition in the fuel rail pressure sensor circuits may set a DTC.
  4. A leaking or restricted fuel injector may set a DTC.
  5. A short to voltage in the crankshaft position signal circuit may set a DTC.
  6. A short to voltage in the camshaft position actuator solenoid valve control circuit may set a DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Observe the DTC information with a scan tool. DTC P0627, P0628, P0629, P069E, or U0109 should not set. If a DTC is set refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Attempt to start and idle the engine.
  3. Observe the DTC information with a scan tool. DTCs P0089, P00C6, P228C, and P228D should not set.
  4. Engine idling, observe the Fuel Rail Pressure Sensor parameter with a scan tool. The pressure should be approximately 1.9-2.1 Mpa (279-305 psi).
  5. Command an increase and decrease in fuel rail pressure with a scan tool. Observe the scan tool Fuel Rail Pressure Sensor parameter. The Fuel Rail Pressure Sensor should increase or decrease with each commanded state.
  6. 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 ON, observe the scan tool fuel pump control module fuel line pressure sensor parameter. Command an increase in the fuel line pressure with a scan tool. Verify the fuel line pressure increases to greater than 414 kPa (60 psi) as commanded. If less than the specified range, refer to «Fuel System Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  2. Remove the G18 high pressure fuel pump and visually inspect the lobes on the camshaft for unusual wear. If the lobes appear normal, replace the G18 high pressure fuel pump. If the lobes are worn, replace the camshaft.

Static Test

  1. Ignition OFF, disconnect the harness connector at the G18 high pressure fuel pump.
  2. Test for 10 ohms plus/minus 1 ohms at 25°C (77°F) between the low control circuit terminal 1 and the high control circuit terminal 2. If not within the specified range, replace the G18 high pressure fuel pump.
  3. Test for infinite resistance between each terminal and the G18 high pressure fuel pump housing. If not the specified value, replace the G18 high pressure fuel pump.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Fuel Pump Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  3. «Intake Camshaft and Valve Lifter Replacement»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-on-vehicle)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
High Pressure Fuel Pump Actuator High ControlP0091, P00C9P0090, P00C8P0092, P00CA, P0690
High Pressure Fuel Pump Actuator Low ControlP0091, P00C9P0090, P00C8P0092, P00CA, P0690

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump actuator is a solenoid valve. The ECM provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit to ground. The ECM monitors the voltage on the circuits to detect a failure.

  1. The ignition voltage is greater than 11 V.
  2. The engine speed is greater than 50 RPM.
  3. The DTCs run continuously within the enabling conditions.

P0090

  1. The ECM detects an open circuit in the high pressure fuel pump actuator low control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P0091

  1. The ECM detects a short to ground in the high pressure fuel pump actuator low control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P0092

  1. The ECM detects a short to voltage in the high pressure fuel pump actuator low control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P00C8

  1. The ECM detects an open circuit in the high pressure fuel pump actuator high control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P00C9

  1. The ECM detects a short to ground in the high pressure fuel pump actuator high control circuit.
  2. The DTC sets when the above condition is present for 4 s.

P00CA

  1. The ECM detects a short to voltage in the high pressure fuel pump actuator high control circuit.
  2. The DTC sets when the above condition is present for 4 s.
  1. DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.
  2. A message center or an indicator displays Reduced Engine Power.

DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Observe the DTC information with a scan tool. DTC P0090, P0091, P0092, P00C8, P00C9, P00CA, P0685, or P1682 should not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Ignition ON, command the Fuel Pressure Regulator ON and OFF with a scan tool while observing the following control circuit status parameters: Fuel Pressure Regulator Control Circuit High Voltage Test Status Fuel Pressure Regulator Control Circuit Open Test Status Fuel Pressure Regulator Control Circuit Low Voltage Test Status Fuel Pressure Regulator High Control Circuit High Voltage Test Status Fuel Pressure Regulator High Control Circuit Open Test Status Fuel Pressure Regulator High Control Circuit Low Voltage Test Status Each parameter should toggle between OK and Not Run or Not Run and OK.
  3. 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 G18 high pressure fuel pump.
  2. Ignition ON, verify that a test lamp does not illuminate between the high control circuit terminal 2 and ground and the low control circuit terminal 1 and ground. If the test lamp illuminates, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  3. Verify that a test lamp does not illuminate between the high control circuit terminal 2 and B+ and the low control circuit terminal 1 and B+. If the test lamp illuminates, test the appropriate control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  4. Connect a 3 A fused jumper wire between the high control circuit terminal 2 and ground. The Fuel Pressure Regulator High Control Circuit Open Test Status should transition from Malfunction to OK and the Fuel Pressure Regulator High Control Circuit Low Voltage Test Status should transition from OK to Malfunction. If not the specified value, test the high control circuit for an open/high resistance.
  5. Connect a 3 A fused jumper wire between the low control circuit terminal 1 and B+. The Fuel Pressure Regulator Control Circuit Open Test Status should transition from Malfunction to OK and the Fuel Pressure Regulator Control Circuit High Voltage Test Status should transition from OK to Malfunction. If not the specified value, test the low control circuit for an open/high resistance.
  6. If all circuits test normal, test or replace the G18 high pressure fuel pump.

Static Test

  1. Ignition OFF, disconnect the harness connector at the G18 high pressure fuel pump.
  2. Test for 9-11 ohms at 25°C (77°F) between the low control circuit terminal 1 and the high control circuit terminal 2 at the G18 high pressure fuel pump. If not within the specified range, replace the G18 high pressure fuel pump.
  3. Measure the resistance between each terminal and the high pressure fuel pump housing. The DMM should display OL. If less than the specified value, replace the G18 high pressure fuel pump.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Pump Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
IAT Sensor 1 SignalP0112, P0114, P2199P0111, P0113, P0114, P2199P0113*, P0114, P2199P0111, P2199
Low ReferenceP0111, P0113, P0114, P2199P0113*, P0114
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 1

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition 1 VoltageP0096, P0097, P0102, P11C2, P2199P0096, P0097, P0102, P11C2, P2199P0096
IAT Sensor 2 SignalP0096, P0097, P11C3, P2199P0096, P0097, P11C2, P2199P0096*, P0097, P11C2, P2199P0096
GroundP0096, P0097, P0102, P11C2, P2199P0096
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 2

Typical Scan Tool Data

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
IAT Sensor 1 Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 1

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition 140°C (-40°F)40°C (-40°F)
IAT Sensor 2 Signal40°C (-40°F)40°C (-40°F)40°C (-40°F)*
Ground40°C (-40°F)
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition 110 Hz10 Hz
IAT Sensor Signal 210 Hz10 Hz10 Hz*
Ground10 Hz
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with coolant temperature
ECT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

ECT Sensor

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The engine control module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F).

The IAT sensor 2 produces a frequency signal based on the inlet air temperature very close to the humidity sensor within the sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F) and Hertz (Hz). The ECM applies 5 V to the circuit. The signal circuit is shared by the IAT sensor 2 and the humidity sensor. Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for these sensors

  1. IAT sensor 2
  2. Humidity sensor
  3. MAF sensor

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. MAF sensor
  5. BARO pressure sensor
IAT Sensor 1IAT Sensor 1 ResistanceIAT Sensor 1 Signal Voltage
ColdHighHigh
WarmLowLow
IAT Sensor 2IAT Sensor 2 FrequencyIAT Sensor 2 Temperature
Cold45 Hz40°C (-40°F)
Warm302 Hz104°C (219°F)

P0096 and P0111

  1. DTCs P0097, P0098, P0112, P0113, P0117, P0118, P0119, or P1682 are not set.
  2. The vehicle has been OFF at least 8 hours.
  3. Ignition 1 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 30°C (54°F). AND
  2. The absolute difference between ECT start-up temperature and the IAT sensor 2 start-up temperature is greater or equal to the absolute difference between ECT start-up temperature and the IAT sensor 1 start-up temperature.
  3. This DTC runs once per ignition cycle when the enabling conditions are met.

P0111

  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 30°C (54°F). AND
  2. The absolute difference between ECT start-up temperature and the IAT sensor 1 start-up temperature is greater or equal to the absolute difference between ECT start-up temperature and the IAT 2 start-up temperature.
  3. This DTC runs once per ignition cycle when the enabling conditions are met.

DTCs P0096 and P0111 are Type B DTCs.

DTCs P0096 and P0111 are Type B DTCs.

  1. An IAT sensor 1 that is skewed, due to more resistance than is normal, can widen the spread between the 2 sensors and cause this DTC to set. Measure and record the resistance of the IAT sensor 1 at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitatchi Sensor)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__temperature-versus-resistance-intake-air) .
  2. A slight to moderate resistance in the IAT sensor 1 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 1 signal circuit, which is interpreted by the ECM as a colder IAT sensor 1.
  3. Inspect the multifunction intake air sensor terminals for corrosion.
  4. 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

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment)
  2. For equivalent regional tools, refer to «Special Tools (Diagnostic Tools)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-special-tools-and-equipment__special-tools-diagnostic-tools) .

Note. Perform Step 1 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Ignition ON, observe the following scan tool parameters. The readings should be within 30°C (54°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 Start-Up ECT
  2. Engine running, observe the scan tool IAT Sensor 1 and IAT Sensor 2 Sensor parameters. Depending on the current ambient temperature and the vehicle operating conditions, the readings should be between: -38 and +149°C (-36 and +300°F) for IAT sensor 1 -38 and +149°C (-36 and +300°F) for IAT sensor 2
  3. Operate the vehicle within the conditions for running the DTC to verify that 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 B75C multifunction intake air sensor.
  2. Ignition OFF, all systems OFF. It may take up to for 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal 3 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 ECM.
  3. Ignition OFF, all vehicle systems OFF, test for less than 5 ohms between the ground circuit terminal 7 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool IAT Sensor 1 parameter is warmer than 149°C (300°F). If colder 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 ECM.
  6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the circuit and repair or replace as necessary.
  7. Ignition ON, test for 4.8-5.2 V between the IAT sensor 2 signal circuit terminal 8 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. NOTE: If the signal circuit is shorted to a voltage the ECM or the sensor may be damaged. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  8. Ignition OFF, connect the red lead of the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the signal circuit terminal 8 at the harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  9. Set the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
  10. Ignition ON, observe the scan tool IAT Sensor 2 parameter. The scan tool parameter should be between 28-32 Hz. If the parameter is not within the specified range, replace the K20 ECM.
  11. If all circuits test normal, test or replace the B75C 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 (Hitatchi Sensor)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__temperature-versus-resistance-intake-air) table. The resistance values should be in range of the table values. If not within the specified range, replace the B75C multifunction intake air sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Ignition 1 VoltageP0096, P0097, P0102, P11C2, P2199P0096, P0097, P0102, P11C2, P2199P0096
IAT Sensor 2 SignalP0096, P0097, P11C3, P2199P0096, P0097, P11C2, P2199P0096*, P0097, P11C2, P2199P0096
GroundP0096, P0097, P0102, P11C2, P2199P0096
*Internal ECM or sensor damage may occur if the circuit is shorted to B+.

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition 140°C (-40°F)40°C (-40°F)
IAT Sensor 2 Signal40°C (-40°F)40°C (-40°F)40°C (-40°F)*
Ground40°C (-40°F)
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

CircuitShort to GroundOpen or High ResistanceShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: Varies with ambient temperature
Ignition 110 Hz10 Hz
IAT Sensor 2 Signal10 Hz10 Hz10 Hz
Ground10 Hz
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor 2

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The engine control module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F).

The IAT sensor 2 produces a frequency signal based on the inlet air temperature very close to the humidity sensor within the sensor bore. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F) and Hertz (Hz). The ECM applies 5 V to the circuit. The signal circuit is shared by the IAT sensor 2 and the humidity sensor. Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for these sensors

  1. IAT sensor 2
  2. Humidity sensor
  3. Mass Air Flow (MAF) sensor

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. MAF sensor
  5. BARO pressure sensor
IAT Sensor 1IAT Sensor 1 ResistanceIAT Sensor 1 Signal Voltage
ColdHighHigh
WarmLowLow
IAT Sensor 2IAT Sensor 2 FrequencyIAT Sensor 2 Temperature
Cold45 Hz40°C (-40°F)
Warm302 Hz104°C (219°F)

P0097, P0098, and P0099

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

P0097

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

The ECM detects that the IAT sensor 2 signal is less than10 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.

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

  1. With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor 2 will gradually increase the scan tool IAT Sensor 2 parameter. This is due to the heat that is generated by the MAF sensor heating elements.
  2. Inspect the multifunction intake air sensor terminals for corrosion.
  3. 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

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References Control Module References for scan tool information

Special Tools

  1. «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment)
  2. For equivalent regional tools, refer to «Special Tools (Diagnostic Tools)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-special-tools-and-equipment__special-tools-diagnostic-tools) .

Note. Perform Step 1 of this verification procedure only if the ignition has been OFF for 8 hours or more.

  1. Ignition ON, observe the following scan tool parameters. The readings should be within 30°C (54°F) of each other. Start-Up IAT Sensor 1 IAT Sensor 2 Start-Up ECT
  2. Engine running, observe the scan tool IAT Sensor 1 and IAT Sensor 2 parameters. Depending on the current ambient temperature and the vehicle operating conditions, the readings should be between: -38 and +149°C (-36 and +300°F) for IAT sensor 1 -38 and +149°C (-36 and +300°F) for IAT sensor 2
  3. Operate the vehicle within the conditions for running the DTC to verify that 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 B75C multifunction intake air sensor.
  2. Ignition OFF, all vehicle systems OFF, test for less than 5 ohms between the ground circuit terminal 7 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the circuit and repair or replace as necessary.
  4. Ignition ON, test for 4.8-5.2 V between the IAT sensor 2 signal circuit terminal 8 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. NOTE: If the signal circuit is shorted to a voltage the ECM or the sensor may be damaged. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Ignition OFF, connect the red lead of the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the signal circuit terminal 8 at the harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  6. Set the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the following specifications. Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 30 Hz
  7. Ignition ON, observe the scan tool IAT Sensor 2 parameter. The scan tool parameter should be between 28-32 Hz. If the parameter is not within the specified range, replace the K20 ECM.
  8. If all circuits test normal, test or replace the B75C multifunction intake air sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/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, the barometric pressure (BARO) sensor, the manifold absolute pressure (MAP) sensor, and the Turbo Boost sensor.

  1. DTCs P0106, P0107, P0236, P0237, P0238, P2227, P2228, P2229, P2230, or P2610 are not set.
  2. Ignition ON after greater than 10s since last ignition cycle.
  3. The BARO, MAP, and Turbo Boost signals are between 50-115 kPA (7-17 psi).
  4. This DTC runs continuously when the above enabling conditions are met.

The ECM detects greater than 10 kPA (1.5 psi) difference between all (3) of the Intake Air Pressure Measurement System sensors.

DTC P00C7 is a Type B DTC.

DTC P00C7 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the DTC information with a scan tool. Verify that DTCs P0106, P0107, P0236, P0237, P0238, P2227, P2228, P2229, or P2230, are not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Ignition ON, observe the scan tool MAP Sensor, BARO Sensor, and Turbo Boost Sensor parameters. Compare the parameters to the «Altitude Versus Barometric Pressure»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__altitude-versus-barometric-pressure) table. If one or more sensor parameters are out of range, refer to the appropriate diagnostic for more information. DTC P2227: Barometric Pressure (BARO) Sensor Performance DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance DTC P0236: Turbocharger Boost System Performance

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition 1 VoltageP0102P0101P0102P0101, P0103
MAF Sensor SignalP0102P0102P0102P0102P0101, P0103, P1101
GroundP0102P0102P0102
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 2,000-10,000 Hz
Ignition Voltage0 Hz0 Hz
MAF Sensor Signal0 Hz0 Hz0 Hz
Ground0 Hz

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.

  1. The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of barometric pressure (BARO), throttle position sensors, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the scan tool as the MAF Performance Test parameter.
  2. The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance Test 1 parameter.
  3. The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance Test 2 parameter.
  4. The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The information from this model is displayed on the scan tool as the Throttle Position Performance Test parameter.

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.

  1. DTCs P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0128, P0335 or P0336 are not set.
  2. The engine speed is between 575-6,600 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 +125°C (-4 and +257°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. A steady or intermittent high resistance of 15 ohms or greater on the ignition voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
  2. Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
  3. Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally, it may cause a rapid fluctuation in the IAT Sensor parameter.
  4. Certain aftermarket air filters may cause this DTC to set.
  5. Certain aftermarket air induction systems may cause this DTC to set.
  6. Modifications to the air induction system may cause this DTC to set.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38522 Variable Signal Generator

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

  1. Verify that the following DTCs are not set: 5 V reference circuits Camshaft position system performance Engine controls ignition relay circuits Ignition circuits-Body control module (BCM) If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system) .
  3. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 1.8-5.5 g/s depending on the engine coolant temperature (ECT) and barometric (BARO) pressure.
  4. 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.
  5. Verify the proper operation of the ECT and IAT sensors. A skewed or stuck ECT or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to «Temperature Versus Resistance - Intake Air Temperature Sensor (Hitatchi Sensor)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__temperature-versus-resistance-intake-air) .
  6. Verify the proper operation of the MAP sensor. A skewed MAP sensor will cause the BARO value to be inaccurate. Refer to «DTC P0106»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) for further diagnosis.
  7. 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. Verify the integrity of the entire air induction system by inspecting for the following conditions: Any damaged components Loose or improper installation An air flow restriction Any vacuum leaks Water intrusion In cold climates, inspect for any snow or ice buildup Inspect the B75C multifunction intake air sensor element for contamination.
  2. Ignition OFF, disconnect the harness connector at the B75C multifunction intake air sensor.
  3. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohms between the ground circuit terminal 7 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  6. Ignition OFF, connect the red lead of the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the signal circuit terminal 6 at the B75C multifunction intake air sensor harness connector. Connect the battery voltage supply to the B+, and the black lead to ground.
  7. Set the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
  8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz. If the MAF Sensor parameter is not within the specified range, replace the K20 engine control module.
  9. If all other circuits test normal, test or replace the B75C multifunction intake air sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for multifunction intake air sensor replacement
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition 1 VoltageP0030, P0036, P0102, P0135, P0141, P0443P0101P0102P0690P0101, P0103
MAF Sensor SignalP0102P0102P0102P0102P0101, P0103, P1101
GroundP0102P0102P0102
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: 2,000-10,000 Hz
Ignition Voltage0 Hz0 Hz
MAF Sensor Signal0 Hz0 Hz0 Hz
Ground0 Hz

MAF Sensor

The mass air flow (MAF) sensor is integrated with the multifunction intake air sensor. The MAF sensor is an air flow meter that measures the amount of air 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 on the MAF sensor signal circuit. The sensor uses the voltage to produce 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). Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor's internal circuits for these sensors

  1. Intake Air Temperature (IAT) sensor 2
  2. Humidity sensor
  3. MAF sensor

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. MAF sensor
  5. BARO pressure 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 11 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 500 Hz (about 0.25 g/s) for at least 250 cylinder firing events.

P0103

The ECM detects that the MAF Sensor signal parameter is at least 11,000 Hz (about 328 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.

  1. Verify the integrity of the air induction system by inspecting for the following conditions: Loose or improper installation Damaged components Any water intrusion in the induction system Any contamination or debris on the sensing elements of the MAF sensor
  2. A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
  3. Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT sensor 1 signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally, it may cause a rapid fluctuation in the IAT Sensor 1 parameter.
  4. Verify that any electrical aftermarket devices are properly connected and grounded. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 38522 Variable Signal Generator

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

  1. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 1.8-5.5 g/s depending on the engine coolant temperature (ECT) and barometric (BARO) pressure.
  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.
  3. 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. Verify that the following DTCs are not set: P0685, P0690 or B1380. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition OFF, disconnect the harness connector at the B75C multifunction intake air sensor.
  3. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohms between the ground circuit terminal 7 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the circuit and repair or replace as necessary.
  5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. Ignition OFF, connect the red lead of the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the signal circuit terminal 6 at the harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  7. Set the «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment) to the following specifications: Signal switch to 5 V Duty Cycle switch to 50 % (Normal) Frequency switch to 5 KHz
  8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz. If the parameter is not within the specified range, replace the K20 ECM.
  9. If all other circuits test normal, replace the B75C multifunction intake air sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for multifunction intake air sensor replacement
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5 V ReferenceP0107, P0452, P0532, P0641P0106, P0107P0107P0108, P0533, P0641P0106, P0107
MAP Sensor SignalP0107P0106, P0107P0107P0108P0106, P0107, P1101
Low ReferenceP0106, P0108P0106, P0108P0106, P0108
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-48 kPa, varies with altitude
5 V Reference0 kPa0 kPa127 kPa
MAP Sensor Signal0 kPa0 kPa127 kPa
Low Reference127 kPa

MAP 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.

  1. The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of barometric pressure (BARO), throttle position, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the scan tool as the MAF Performance Test parameter.
  2. The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance Test 1 parameter.
  3. The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance Test 2 parameter.
  4. The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The information from this model is displayed on the scan tool as the Throttle Position Performance Test parameter.

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 following table illustrates the possible failure combinations and the resulting DTC or DTCs.

MAF Performance TestMAP Performance Test 1MAP Performance Test 2Throttle Position Performance TestDTCs PassedDTCs Failed
OKOKP0101, P0106, P0121, P1101None
OKOKFaultOKP0101, P0106, P0121, P1101None
FaultOKFaultOKP0106, P0121, P1101P0101
OKFaultFaultOKP0101, P0121, P1101P0106
FaultFaultFaultOKP0121, P1101P0101, P0106
OKFaultP0101, P0106, P1101P0121
OKOKFaultFaultP0101, P0106, P0121, P1101None
FaultOKFaultFaultP0101, P0106, P0121P1101
FaultFaultFaultP0101, P0106, P0121P1101

Scan Tool Diagnostic Test Results

  1. DTC P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, or P0336 is not set.
  2. The engine speed is between 400-8,192 RPM.
  3. The IAT Sensor parameter is between -7° to +125°C (+19° to +257°F).
  4. The ECT Sensor parameter is between 70-125°C (158-257°F).
  5. This DTC runs continuously within the enabling conditions.

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

DTC P0106 is a Type B DTC.

DTC P0106 is a Type B DTC.

  1. A wide open throttle (WOT) acceleration from a stop should cause the MAP sensor parameter on the scan tool to increase rapidly to near the BARO parameter at the time of the 1-2 shift.
  2. The BARO that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is running, the ECM will continually update the BARO value near WOT using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

GE 23738-A Mityvac

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

  1. Verify that DTC P0697 is not set. If the DTC is set, refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  2. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system) .
  3. Ignition OFF for 90 s, determine the current vehicle testing altitude.
  4. Ignition ON, engine OFF, observe the scan tool BARO parameter. Compare the parameter to the «Altitude Versus Barometric Pressure»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__altitude-versus-barometric-pressure) table. The BARO parameter should be within the specified range indicated in the table.
  5. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. The reading should be within 5 kPa of the known good vehicle.
  6. 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. Verify the integrity of the entire air induction system by inspecting for the following conditions: Any damaged components Loose or improper installation An air flow restriction Any vacuum leak Improperly routed vacuum hoses In cold climates, inspect for any snow or ice buildup Verify that restrictions do not exist in the MAP sensor port or vacuum source.
  2. Ignition OFF for 90 s, disconnect the harness connector at the B74 MAP sensor.
  3. Ignition OFF, 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 ECM.
  4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Verify the scan tool MAP Sensor parameter is less than 1 kPa. If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 127 kPa. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  7. If the circuits test normal, test or replace the B74 MAP sensor.

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

Skewed Signal Test

  1. Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
  2. Ignition ON, engine OFF, observe the MAP Sensor scan tool parameter.
  3. Use the observed MAP Sensor scan tool parameter that is closest to a value that is indicated in the first column. THEN
  4. Using the GE 23738-A Mityvac to apply 5 in Hg of vacuum to the B74 MAP sensor, the parameter in the first column should decrease by 17 kPa. The acceptable range is indicated in the second column.
  5. Using the GE 23738-A Mityvac to apply 10 in Hg of vacuum to the B74 MAP sensor, the parameter in the first column should decrease by 34 kPa. The acceptable range is indicated in the third column.
Ignition ON, Engine OFF, MAP Sensor ParameterMAP Sensor Parameter With 5 Inches of Vacuum AppliedMAP Sensor Parameter With 10 Inches of Vacuum Applied
100 kPa79-87 kPa62-70 kPa
95 kPa74-82 kPa57-65 kPa
90 kPa69-77 kPa52-60 kPa
80 kPa59-67 kPa42-50 kPa
70 kPa49-57 kPa32-40 kPa
60 kPa39-47 kPa22-30 kPa

Erratic Signal Test

  1. Ignition OFF, remove the B74 MAP sensor.
  2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
  3. Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.
  4. Install a jumper wire at terminal 3 of the B74 MAP sensor.
  5. Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.
  6. Ignition ON, with the J 23738-A Mityvac or J 35555 Metal Mityvac , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 V, without any spikes or dropouts. If the voltage reading is erratic, replace the B74 MAP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5 V ReferenceP0107, P0452, P0532, P0641P0106, P0107P0107P0108, P0533, P0641P0106, P0107
MAP Sensor SignalP0107P0106, P0107P0107P0108P0106, P0107, P1101
Low ReferenceP0106, P0108P0106, P0108P0106, P0108
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-48 kPa, varies with altitude
5 V Reference0 kPa0 kPa127 kPa
MAP Sensor Signal0 kPa0 kPa127 kPa
Low Reference127 kPa

MAP Sensor

The manifold absolute pressure (MAP) sensor has a 5 V reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5 V to the MAP sensor on the 5 V reference circuit, and provides a ground for the low reference circuit. The MAP sensor provides a voltage signal to the ECM on the signal circuit relative to the intake manifold pressure changes.

  1. DTC P0697 is not set.
  2. The engine is running.
  3. This DTC runs continuously within the enabling conditions.

P0107

The ECM detects that the MAP sensor voltage is less than 0.20 V for more than 5 s.

P0108

The ECM detects that the MAP sensor voltage is more than 4.80 V for more than 5 s.

DTCs P0107 and P0108 are Type B DTCs.

DTCs P0107 and P0108 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. J 23738-A Mityvac
  2. J 35555 Metal Mityvac

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

  1. Verify that DTC P0697 is not set. If the DTC is set, refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  2. Ignition ON, observe the scan tool MAP Sensor parameter. The reading should be between 0.20-4.80 V.
  3. 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 for 90 s, disconnect the harness connector at the B74 MAP sensor.
  2. 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 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Verify the scan tool MAP Sensor parameter is less than 1 kPa. If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 127 kPa. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  6. If the circuits test normal, test or replace the B74 MAP sensor.

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

Erratic Signal Test

  1. Ignition OFF, remove the B74 MAP sensor.
  2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
  3. Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.
  4. Install a jumper wire at terminal 3 of the B74 MAP sensor.
  5. Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.
  6. Ignition ON, with the J 23738-A Mityvac or the J 35555 Metal Mityvac , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5 V without any spikes or dropouts. If the voltage reading is erratic, replace the B74 MAP sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
IAT Sensor SignalP0112P0113P0113P0111, P0114
Low ReferenceP0113P0113, P0114P0111, P0114
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running Parameter Normal Range: Varies with ambient temperature
IAT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)*
Low Reference40°C (-40°F)40°C (-40°F)*
*Internal ECM or sensor damage may occur if the circuit is shorted to B+

IAT Sensor

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The engine control module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F).

The multifunction intake air sensor houses the following

  1. IAT sensor 1
  2. IAT sensor 2
  3. Humidity sensor
  4. Mass Air Flow (MAF) sensor
  5. BARO pressure sensor
IAT Sensor 1IAT Sensor 1 ResistanceIAT Sensor 1 Signal Voltage
ColdHighHigh
WarmLowLow

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

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

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

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.

  1. With the ignition ON, the engine OFF, if the engine is cold, 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 MAF sensor heating elements.
  2. Depending on the ambient temperature, an IAT sensor 1 signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 and/or P0114 to set. This condition causes a rapid fluctuation in the IAT Sensor 1 parameter.
  3. An IAT sensor 1 signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 and/or P0114 to set.
  4. A MAF sensor ground circuit that is open will cause a DTC P0113 and/or a DTC P0114 to set.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running, observe the scan tool IAT Sensor 1 parameter. The reading should be between -40 and +149°C (-40 and +300°F) depending on the current ambient temperature and the vehicle operating conditions.
  2. Operate the vehicle within the Conditions for Running the DTC to verify that 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 B75C multifunction intake air sensor.
  2. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohms between the low reference circuit terminal 3 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, verify the scan tool IAT Sensor 1 parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 ECM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool IAT Sensor 1 parameter is warmer than 149°C (300°F). If colder 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 ECM.
  5. If all circuits test normal, test or replace the B75C multifunction intake air sensor.

Measure and record the resistance of the IAT sensor 1 at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance - Intake Air Temperature Sensor (Hitatchi Sensor) table.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for multifunction intake air sensor replacement.
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
ECT Sensor SignalP0117P0118P0118P0118P0116, P0128
Low ReferenceP0118P0118P0118P0128
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: -39 to +120°C (-38 to +248°F)
ECT Sensor150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

ECT Sensor Temperature

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5V 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. DTCs P0111, P0112, P0113, P0114, P0117, P0118, P0128, P0502, P0503, P0601, P1621, or P2610 are not set.
  2. The vehicle has had a minimum ignition OFF time of 8 hours.
  3. The engine is running.
  4. The start-up modeled ECT is colder than 50°C (+122°F).
  5. The previous accumulated MAF is greater than 6,000 grams.
  6. The previous engine run time is greater than 600 seconds. OR
  7. The vehicle has had a minimum ignition OFF time of 8 hours.
  8. The engine is running.
  9. The previous ECT at engine shutdown is warmer than 75°C (+167°F).
  10. The previous accumulated MAF is greater than 6,000 grams.
  11. The previous engine run time is greater than 600 seconds.
  12. This DTC runs once per ignition cycle within the enabling conditions.

P0116

The ECM detects a temperature difference at initial power-up that indicates that the actual measured ECT is 10°C (18°F) greater than the modeled ECT, and an active block heater has not been detected.

DTC P0116 is a Type B DTC.

DTC P0116 is a Type B DTC.

  1. 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. The ECM memory which includes the ignition OFF timer is maintained by battery power. If the ECM or the battery are disconnected for less than 15 seconds the proper operation of the ECM memory and the timer can be disrupted. Always disconnect these components for greater than 30 seconds.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Turn OFF the ignition.
  2. Inspect the cooling system surge tank for the proper engine coolant level. Refer to «Cooling System Leak Testing»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-leak-testing) , and «Cooling System Draining and Filling (Static Fill)»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
  3. If the ignition has been OFF for 8 hours or greater, the intake air temperature (IAT) sensor, the IAT sensor 2, and the ECT sensor should be within 9°C (16°F) of each other and also the ambient temperature. Ignition ON, observe the scan tool IAT Sensor, IAT Sensor 2 and the ECT Sensor parameters. Compare those sensor parameters to each other and also to the ambient temperature to determine if the ECT sensor is skewed warmer.
  4. Engine running, observe the ECT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°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 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 vehicles systems to power down.
  2. Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor.
  3. Test for less than 5 ohms between the low reference circuit terminal A 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 warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is warmer than 142°C (288°F). If colder 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 the circuits test normal, test or replace the B34 engine coolant temperature sensor.

Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance (ECT) , Temperature Versus Resistance (IAT) , Temperature Versus Resistance (IAT 2) table.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Engine Coolant Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
ECT Sensor SignalP0117P0118P0118P0118P0116, P0128, P0119
Low ReferenceP0118P0118P0118P0128, P0119
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine Running Parameter Normal Range: -39 to +120°C (-38 to +248°F)
ECT Sensor143°C (289°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

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 5V to the ECT sensor signal circuit and a ground for the low reference circuit.

  1. The ignition is ON or the engine is running.
  2. These DTCs run continuously within the enabling conditions.

P0117

The ECM detects that the ECT is warmer than 142°C (288°F) for greater than 4 seconds.

P0118

The ECM detects that the ECT is colder than -39°C (-38°F) for greater than 4 seconds.

P0119

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

  1. DTCs P0117, P0118 and P0119 are Type B DTCs.
  2. The cooling fans will be commanded ON.
  3. The AC compressor will be commanded OFF.

DTCs P0117, P0118 and P0119 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the ECT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F) depending on the current ambient temperature and the vehicle operating conditions.
  2. 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. Ignition Off and all vehicle systems off, It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal A 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.
  3. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is warmer than 142°C (288°F). If colder 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.
  5. If the circuits test normal, test or replace the B34 engine coolant temperature sensor.

Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance (ECT) , Temperature Versus Resistance (IAT) , Temperature Versus Resistance (IAT 2) table.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Engine Coolant Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP06A3P0122*, P0222*, P16A0P06A3P0121*, P16A2, P2135*
Throttle Position Sensor SignalP0122*, P0222*, P16A0P0122*, P0222*, P16A1P0123*, P0223*, P16A0**, P16A1**, P16A2**P0121*, P16A2, P2135*
Low ReferenceP0123*, P0223*, P16A1P0121*, P16A2, P2135*
* This DTC set indicates an internal throttle body condition. ** A short to voltage causes P16A1 to set. If DTC P16A0, P16A1, and P16A2 set at the same time, an intermittent circuit condition exists.
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating with the throttle closed. All accessories OFF. Parameter Normal Range: Throttle Position Sensor 1 3.75-4.75 V
5 V Reference0.0 V5.0 V5.0 V
Throttle Position Sensor Signal0.0 V0.0 V0.0 V
Low Reference0.0 V

Throttle Position Sensor 1

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating with the throttle closed. All accessories OFF. Parameter Normal Range: Throttle Position Sensor 2 0.45-0.90 V
5 V Reference0.0 V0.0 V0.0 V
Throttle Position Sensor Signal5.0 V5.0 V5.0 V
Low Reference5.0 V

Throttle Position Sensor 2

The throttle body assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. The throttle position sensor is mounted within the throttle body assembly and is not serviceable. The engine control module (ECM) supplies the throttle body with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and an asynchronous signal/serial data circuit. The asynchronous signal means communication is only going from the throttle body to the ECM. The throttle body cannot receive data from the ECM over the signal/serial data circuit. The throttle position sensor provides a signal voltage that changes relative to throttle blade angle. The customized integrated circuit translates the voltage based position information into serial data using the Society of Automotive Engineers (SAE) J2716 Single Edge Nibble Transmission (SENT) protocol. The throttle position sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The ECM decodes the serial data signal and is used as voltages for throttle position sensor 1 and 2.

P0121

  1. DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, or P0336 is not set.
  2. The engine speed is between 400-6,200 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. The DTC runs continuously when the above conditions are met.

P0122, P0123, P0222, P0223

  1. DTC P06A3 is not set.
  2. The ignition is ON or the engine is running.
  3. The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
  4. The DTCs run continuously when the above condition are met.

P16A0, P16A1, or P16A2

  1. The ignition is ON or the engine is operating.
  2. The run/crank voltage is greater than 6.4 V.
  3. The DTCs run continuously once the above conditions are met for greater than 1 s.

P2135

  1. DTCs P0122, P0123, P0222, P0223, or P06A3 are not set.
  2. The ignition is ON or the engine is running.
  3. The run/crank or powertrain relay voltage is greater than 6.0 V and reduced power is not active.
  4. The DTC runs continuously when the above conditions are met.

P0121

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

P0122

The ECM detects the throttle position sensor 1 signal voltage is less than 0.32 V for greater than 1 s.

P0123

The ECM detects the throttle position sensor 1 signal voltage is greater than 4.7 V for greater than 1 s.

P0222

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

P0223

The ECM detects the throttle position sensor 2 signal voltage is greater than 4.6 V for greater than 1 s.

P16A0

The ECM detects a low voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

P16A1

The ECM detects a high voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

P16A2

The ECM detects an incorrect message was received over the throttle position sensor signal circuit for greater than 1 s.

P2135

The ECM detects that throttle position sensor 1 and 2 disagree greater than 7-10 percent for greater than 1 s.

  1. DTCs P0121 is a Type B DTC.
  2. DTCs P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 are Type A DTCs.
  3. The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode.
  4. A message center or an indicator displays Reduced Engine Power.
  5. Under certain conditions, the ECM commands the engine OFF.
  1. DTCs P0121 is a Type B DTC.
  2. DTCs P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 are Type A DTCs.
  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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify that DTC P0601-P0606, P06A3, and P16F3 is not set. If any of the DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/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
  3. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %. 90 % or greater Refer to «Throttle Body Cleaning»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions__throttle-body-cleaning) . If less than 90 %
  4. Verify the scan tool Throttle Position Sensor 1 and Throttle Position Sensor 2 voltage parameters are greater than 0.0 V. If 0.0 V Refer to Circuit/System Testing If greater 0.0 V
  5. 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
  6. Verify DTC P0121, P0122, P0123, P0222, P0223, P16A0, P16A1, P16A2, and P2135 is not set. If any of the DTCs are set Refer to Circuit/System Testing If none of the DTCs are 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, and all vehicle systems OFF, disconnect the harness connector at Q38 throttle body assembly. 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 4 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 5 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 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. Test or replace the Q38 throttle body assembly.
  1. «Throttle Body Assembly Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/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 reset. If any DTC sets Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis. If no DTC sets
  8. All OK
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
ECT Sensor SignalP0117P0118P0118P0118P0116, P0128
Low ReferenceP0118P0118P0118P0128
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine Running at various operating conditions Parameter Normal Range: Varies with coolant temperature
ECT Sensor Signal150°C (302°F)40°C (-40°F)40°C (-40°F)
Low Reference40°C (-40°F)40°C (-40°F)

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 analyze the performance of the thermostat, by using the ECT sensor to determine if the engine coolant will increase at the correct rate, and also meet the calibrated target temperatures under various operating conditions. The ECM uses the start-up ECT and the start-up intake air temperature (IAT) to begin the diagnostic calculation. The air flow into the engine is accumulated , and vehicle speed, distance, and engine run time are also factored in to determine if the ECT does increase normally and reach the calibrated target temperatures.

  1. DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0121, P0123, P0222, P0223, P0502, P0503, P1104, P2100, P2101, P2102, P2135 is not set.
  2. The start-up ECT is colder than 66°C (151°F).
  3. The start-up IAT is between -7 to +55°C (+19 to +131°F).
  4. The engine run time is greater than 2 minutes.
  5. The vehicle has traveled greater than 0.8 kilometers (0.5 miles) at greater than 8 km/h (5 mph).
  6. The ethanol in the fuel is less than 87 %.
  7. The mass air flow (MAF) average is greater than 1 g/s.
  8. This DTC runs once per ignition cycle within the enabling conditions.

The ECM detects that the maximum amount of cumulative airflow has been attained, and the minimum ECT of 70°C (158°F) has not been met with a start-up IAT colder than 10°C (50°F).

OR

The ECM detects that the maximum amount of cumulative airflow has been attained, and the minimum ECT of 80°C (176°F) has not been met with a start-up IAT warmer than 10°C (50°F).

  1. DTC P0128 is a Type B DTC.
  2. The Engine Coolant Temperature Gauge is inoperative.
  3. The A/C is commanded OFF and inoperative.
  4. The Cooling Fans are commanded ON.

DTC P0128 is a Type B DTC.

  1. DTC P0128 occurring with insufficient vehicle interior heating is an indication of improper thermostat operation.
  2. Corrosion in the ECT sensor terminals or the ECT harness connector results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.
  3. A slight to moderate resistance in the ECT sensor signal circuit or low reference circuit will affect this diagnostic. This condition results in a greater voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a colder ECT.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to «Cooling System Leak Testing»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-leak-testing) , and «Cooling System Draining and Filling (Static Fill)»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system) , «Cooling System Draining and Filling (GE 47716)»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system) .
  2. Ignition OFF for 8 hours or greater.
  3. Ignition ON, observe the scan tool ECT Sensor and IAT Sensor parameters. The ECT, IAT and ambient temperatures should be within 15°C (27°F) of each other.
  4. Use the scan tool to verify the proper operation of the engine cooling system fans.
  5. Verify the proper heat range, and the operation of the thermostat. Refer to «Thermostat Diagnosis»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system__thermostat-diagnosis) .
  6. 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. Ignition OFF and vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal A 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.
  3. Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F). If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  4. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is warmer than 149°C (300°F). If colder 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.
  5. If the circuits test normal, test or replace the B34 engine coolant temperature sensor.

Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance (ECT) , Temperature Versus Resistance (IAT) , Temperature Versus Resistance (IAT 2) table .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Engine Coolant Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-repair-instructions)
  2. «Engine Coolant Thermostat Replacement (LHU)»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
HO2S High SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P1133, P2A00
HO2S Low SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P1133, P2A00
HO2S Heater Voltage SupplyP0030, P0036, P0132, P0135, P0138, P0141, *P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0690P0135, P0141
HO2S Heater ControlP0030, P0036, P0053, P0054, P0135, P0141P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0135, P0141
* Opens fuse
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running Parameter Normal Range: 200-800 mV
HO2S High Signal0 V1.9 V1.9 V
HO2S Low Signal0 V1.9 V1.9 V

HO2S Sensor 1 Voltage

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.

P0131, P0137

  1. DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282. P0283, P0411, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1104, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P16F3, P2100, P2101, P2102, P2103, P2135, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P2440, P2444 are not set.
  2. The engine is in Closed Loop status.
  3. The system voltage is between 10-32 V.
  4. The fuel level is greater than 10 percent.
  5. The scan tool device controls are not active.
  6. Deceleration fuel cut off not active.
  7. Fuel composition is less than or equal to 87 percent ethanol.
  8. DTCs P0131 and P0137 run continuously when the above conditions are met for 5 s.

P0132, P0138

  1. DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, P0283, P0411, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1104, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P16F3, P2100, P2101, P2102, P2103, P2135, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P217B, P217C, P217E, P217F, P2440, P2444 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10 percent.
  4. Engine run time greater than 2.5 min plus a 40 s delay.
  5. Fuel control is not in power enrichment.
  6. Fuel composition is less than or equal to 87 percent ethanol.
  7. DTCs P0132 and P0138 run continuously when the above conditions are met for 5 s.

P0134, P0140

  1. DTCs P0068, P0101, P0102, P0103, P0122, P0123, P0222, P0223, P1104, P16F3, P2100, P2101, P2102, P2103, P2135 are not set.
  2. The system voltage is between 10-32 V.
  3. Engine run time greater than 2.5 minutes.
  4. Fuel composition is less than or equal to 87 percent ethanol.
  5. DTCs P0134 and P0140 run continuously when the above conditions are met.

P0131, P0137

  1. The ECM detects that the HO2S Voltage parameter is less than 50 mV.
  2. DTC sets within 50 s when the above condition is met.

P0132, P0138

  1. The ECM detects that the HO2S parameter is more than 1,050 mV.
  2. DTC sets within 15 s when the above condition is met.

P0134, P0140

  1. The ECM detects that the HO2S voltage parameter is greater than 1700 mV.
  2. DTC P0137 sets within 15 s when the above condition is met.

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

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set. If a B52 HO2S heater DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Engine running, observe the appropriate scan tool B52 HO2S voltage parameter. The reading should be within the range of 50-1,050 mV.
  3. 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 appropriate B52 HO2S harness connector.
  2. Ignition ON, observe the appropriate scan tool HO2S voltage parameter. The parameter should display 1.9 V. If less than the specified range, test the high and low signal circuits for a short to ground. If both signal circuit test normal, replace the K20 ECM.
  3. Ignition ON, test for 2.5-3.0 V between the high signal circuit terminal B and ground. If less than the specified range, test the high signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the high signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition OFF, connect a 3 A fused jumper wire between the high signal circuit terminal B and the low signal circuit terminal A.
  5. Ignition ON, verify the scan tool HO2S parameter displays 0.0 V. If greater than the specified range, test the low signal circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. If all circuits test normal, test or replace the appropriate B52 HO2S.

Note. For DTC P0131 and P0132, in order to ensure that the performance of the catalyst has not been affected by the fault that set this DTC, operate the vehicle within the conditions for running and setting DTC P0420 and verify that P0420 runs and passes. Refer to DTC P0420 .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
  4. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
HO2S High SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P2A00
HO2S Low SignalP0131, P0137P0132, P0134, P0138, P0140P0132, P0134, P0138, P0140P0133, P013A, P013B, P013E, P013F, P2A00
HO2S Heater Voltage SupplyP0030, P0036, P0132, P0135, P0138, P0141, *P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0690P0135, P0141
HO2S Heater ControlP0030, P0036, P0053, P0054, P0135, P0141P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0030, P0036, P0132, P0134, P0135, P0138, P0140, P0141P0135, P0141
* Opens fuse

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.

P0133

  1. DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0300, P0411, P0412, P0418, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496 are not set.
  2. The engine coolant temperature (ECT) is hotter than 69°C (157°F).
  3. The system voltage is between 10-32 V.
  4. The fuel level is greater than 10 percent.
  5. The engine run time is greater than 60 s.
  6. The engine speed is between 1,000-3,500 RPM.
  7. The scan tool device controls are not active.
  8. The HO2S heaters have been on for more than 40 s.
  9. The learned HO2S heater resistance is valid.
  10. The intake air temperature (IAT) is greater than -40°C (-40°F).
  11. The fuel composition is less than 87 percent ethanol.
  12. The BARO pressure is greater than 70 kPa (10 psi).
  13. The fuel control is not in power enrichment.
  14. Decel fuel cut off is not active.
  15. The mass airflow (MAF) is between 10-50 g/s.
  16. The engine is in Closed Loop status.
  17. DTC P0133 runs once per drive cycle when the above conditions are met for 3 s.

P013A

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10 percent.
  4. DTC P013E and P2270 have run and passed. THEN
  5. Decel fuel cut off is active.
  6. The accelerator pedal position (APP) is stable.
  7. This DTC runs once per trip.

P013B and P013F

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10 percent.
  4. DTCs P013A, P013E, P013F, P2270, and P2271 have run and passed.
  5. DTCs P013B and P013F run once per trip.

P013E

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10 percent.
  4. DTC P2270 has run and passed. THEN
  5. Decel fuel cut off is active.
  6. The accelerator pedal position (APP) is stable.
  7. This DTC runs once per trip.

P015A and P015B

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The ignition voltage is between 10-32 V.
  3. The engine coolant temperature (ECT) is greater than 70°C (158°F).
  4. The intake air temperature (IAT) is warmer than -40°C (-40°F)
  5. The HO2S heater is on for greater than 180 s.
  6. The fuel level is greater than 10 percent.
  7. The engine run time is greater than 120 s.
  8. The engine speed is between 1,100-2,300 RPM.
  9. The vehicle speed is between 51-120 kmh (31.7-74.6 mph).
  10. The engine airflow is between 3-12 g/s.
  11. Device controls are not active.
  12. The evaporative emission (EVAP) diagnostics are not in control of purge.
  13. The predicted catalytic converter temperature is between 600-900°C (1,112-1,652°F).
  14. The fuel system is in Closed Loop.
  15. The DTCs run once per drive cycle when the above conditions are met.

P2270

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10 percent.
  4. The engine speed is between 1175-2200 RPM to enable and 1100-2300 RPM to keep enabled.
  5. The engine air flow is between 2-10 g/s.
  6. The vehicle speed is 65-119 km/h (41-74 mph) to enable and 56-132 km/h (35-82 mph) to keep enabled.
  7. The engine is in Closed Loop status.
  8. The Power Take-Off is not active.
  9. The HO2S heaters are on for more than 180 s.
  10. This DTC runs once per trip when all of the above conditions have been met for 3 s.

P2271

  1. DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270 are not set.
  2. The system voltage is between 10-32 V.
  3. The fuel level is greater than 10 percent.
  4. The engine speed is 1175-2200 RPM.
  5. The engine air flow is between 2-10 g/s.
  6. The vehicle speed is 65-119 km/h (41-74 mph).
  7. The engine is in Closed Loop status.
  8. Power take-off is not active.
  9. The HO2S heaters have been on more than 180 s.
  10. DTCs P013A, P013E, and P2270 have run and passed. THEN
  11. Decel fuel cut off is active.
  12. The APP is stable.
  13. This DTC runs once per trip when the above conditions are met.

P2A00

  1. DTCs P0068, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0131, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P1516, P2101, P2119, P2135, P2176 are not set.
  2. The engine run time is greater than 100 s.
  3. The engine speed is between 700-3000 RPM.
  4. The system voltage is between 10-32 V.
  5. The engine air flow is between 3-45 g/s.
  6. The engine coolant temperature is greater than 70°C (158°F).
  7. Decel fuel cut off is not active.
  8. Fuel enrichment is not active.
  9. DTC P2A00 runs continuously when the above conditions are met for 5 s.

P0133

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

P013A

The ECM detects that the HO2S 2 average response time during the rich to lean transition is greater than a calculated value.

P013B

The ECM detects that the HO2S 2 average response time during the lean to rich transition is greater than a calculated value.

P013E

The ECM detects that the HO2S 2 sensor cannot achieve voltage below 450 mV within a calibrated time.

P013F

The ECM detects that the HO2S sensor cannot achieve voltage above 350 mV within a calibrated time.

P015A

  1. The ECM detects that the length of time to change from rich to lean is greater than a calibrated value.
  2. DTC P015A sets within 60 s when the above condition is met.

P015B

  1. The ECM detects that the length of time to change from lean to rich is greater than a calibrated value.
  2. DTC P015B sets within 60 s when the above condition is met.

P2270

The ECM detects that the HO2S 2 sensor cannot achieve a voltage greater than 875 mV within a calibrated time.

P2271

The ECM detects that the HO2S 2 sensor cannot achieve a voltage less than 100 mV within a calibrated time.

P2A00

HO2S 1 voltage is greater than 1100 mV for more than 5 s.

  1. DTCs P0133, P013E, P013F, P2270, P2271, P2A00 are Type B DTCs.
  2. DTCs P013A, P013B, P015A, and P015B are Type A DTCs.
  1. DTCs P0133, P013E, P013F, P2270, P2271, P2A00 are Type B DTCs.
  2. DTCs P013A, P013B, P015A, and P015B are Type A DTCs.
  1. Exhaust leaks may be small, pin hole size leaks and may occur at welds or other attachments to the exhaust system.
  2. A DTC may set with an exhaust system leak small enough that it may not be audible.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set. If a B52 HO2S heater DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Verify none of the following conditions exist: Lean or rich fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) . Water intrusion in the HO2S harness connector Low or high fuel system pressure-Refer to «Fuel System Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) . Fuel saturation of the evaporative emission (EVAP) canister Exhaust leaks-Refer to «Exhaust Leakage»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system__exhaust-leakage) . Engine vacuum leaks Engine coolant consumption-Refer to «Loss of Coolant»(/buick/regal/v-2009-2013/remont/cooling-system-mechanical/#engine-cooling-system__loss-of-coolant) . If you find any of the above conditions, repair as necessary.
  3. If all conditions test normal, test or replace the appropriate HO2S.
  4. 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.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Heated Oxygen Sensor Replacement - Sensor 1»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Sensor 2»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  3. Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an HO2S.
  4. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, programming, and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/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 the 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 (FT) values. The short term FT values change rapidly in response to the HO2S voltage signals. These changes fine tune the engine fueling. The long term FT makes coarse adjustments in order to maintain an optimum air/fuel ratio. The ideal FT values are around zero percent. A positive FT value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative FT value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition.

  1. DTCs P0053, P0101, P0102, P0103, P0106, P0107, P0108, P0131, P0132, P0133, P0134, P0135, P0178, P0179, P0201-P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301-P0304, P0411, P0442, P0443, P0455, P0496, P0506, P0507, P1133, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2227, P2228, P2229, P2230, P2269, P2440, P2444, or P2A00 are not set.
  2. The engine is in Closed Loop status.
  3. The catalyst monitor intrusive test is not active.
  4. The post O2 sensor intrusive test is not active.
  5. The device controls are not active.
  6. The EVAP leak test is not active.
  7. The engine coolant temperature (ECT) is between -20 and +150°C (-4 and +302°F).
  8. The intake air temperature (IAT) is between -20 and +150°C (-4 and +302°F).
  9. The manifold absolute pressure (MAP) is between 15-255 kPa (2.2-37 PSI).
  10. The engine speed is between 400-6,600 RPM.
  11. The mass air flow (MAF) is between 1-512 g/s.
  12. The barometric pressure (BARO) is greater than 70 kPa (10.2 PSI).
  13. The fuel level is greater than 10 percent.
  14. These DTCs run continuously when the above conditions have been met.
  1. The long term FT weighted average value is more or less than a calibrated value.
  2. The above condition is present for approximately 3 minutes 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. The normal Short Term FT parameter should be between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.
  2. The Long Term FT parameter should be between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.
  3. Certain aftermarket air filters may cause a DTC to set.
  4. Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.
  5. Certain aftermarket exhaust system components may cause a DTC to set.

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that other DTCs are not set. If any other DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition ON, engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to «Altitude Versus Barometric Pressure»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__altitude-versus-barometric-pressure) . If the MAP sensor does not indicate the correct barometric pressure, refer to «DTC P0106»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) .
  3. With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be between 2-6 g/s at idle. If the MAF sensor parameter is not between 2-6 g/s at idle, refer to «DTC P0101»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) , or «DTC P0102 or P0103»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) .

P0171

Note. EVAP purge enablement may cause the FT to be momentarily outside the normal range.

Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The reading should be between 0-29 percent.

  1. If greater than the specified range, inspect for the following
  1. Vacuum hoses for splits, kinks, and improper connections
  2. Insufficient fuel in the tank
  3. Low fuel pressure-Refer to «Fuel System Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  4. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  5. Malfunctioning fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  6. Missing, loose, or leaking exhaust components from the HO2S forward-Refer to «Symptoms - Engine Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) .
  7. Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings
  8. The air induction system and the air intake ducts for leaks or for a missing air filter element
  9. A cracked EVAP canister
  10. Evaporative pipes obstructed or leaking
  11. The crankcase ventilation system for leaks-Refer to «Crankcase Ventilation System Inspection/Diagnosis (With Turbocharger)»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures__crankcase-ventilation-system-inspectiondiagnosis-with-turboc) .
  12. The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
  13. The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit
  14. Malfunctioning engine components-Refer to «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) .

P0172

Note. EVAP purge enablement may cause the FT to be momentarily outside the normal range.

Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The reading should be between -16 and 0 percent.

  1. If less than the specified range, inspect for the following
  1. Vacuum hoses for splits, kinks, and improper connections
  2. The air intake duct for being collapsed or restricted
  3. The air filter for being dirty or restricted
  4. Objects blocking the throttle body
  5. Excessive fuel in the crankcase due to leaking fuel injectors
  6. The EVAP control system for improper operation
  7. Excessive fuel pressure-Refer to «Fuel System Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  8. Malfunctioning fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  9. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  10. The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system
  11. The HO2S signal circuit shorted to voltage
  12. Malfunctioning engine components-Refer to «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) .

Perform the Diagnostic Repair Verification after performing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Alcohol content and fuel temperature information is supplied to the ECM from the fuel composition sensor. The fuel composition sensor has a battery positive circuit, a signal circuit, and a ground circuit. The fuel composition sensor uses a microprocessor inside the sensor to measure the ethanol percentage and fuel temperature, and changes output signals accordingly. The signal circuit carries both the ethanol percentage, and the fuel temperature within the same signal. The signal is both variable frequency and variable pulse width. The frequency signal indicates the ethanol percentage, and the pulse width indicates fuel temperature. The ECM provides an internal pull up to 5 V on the signal circuit, and the fuel composition sensor pulls the 5 V to ground in pulses. The normal range of operating frequency is between 50-150 Hz. The normal pulse width ranges between 1-5 milliseconds. The microprocessor inside the sensor is capable of a certain amount of self-diagnosis. An output frequency of 180 Hz indicates that the fuel is contaminated or an internal sensor fault has been detected.

  1. The ignition voltage is greater than 11 V.
  2. The DTC runs continuously when the above condition is met.

The ECM detects that the fuel composition sensor output frequency is less than 45 Hz for greater than 6 s.

DTC P0178 is a Type B DTC.

DTC P0178 is a Type B DTC.

  1. The Fuel Composition Sensor scan tool parameter reacts immediately to any change in the fuel composition sensor circuits, but may not react long enough to set a DTC.
  2. A reading of 16 Hz in the Freeze Frame/Failure Records indicates a circuit failure.
  3. An intermittent condition may not be detected because the sensor does not immediately power down and the connection may be restored before voltage drops below the operating threshold.
  4. If this DTC will not reset and the parameters are steady, thoroughly inspect all fuel composition sensor circuits for an intermittent open.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. J 38522 Variable Signal Generator
  2. J 44175-A Fuel Composition Tester

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

  1. Engine running, verify the scan tool Fuel Composition Sensor parameter is between 50-150 Hz.
  2. 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 B198 fuel composition sensor.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the circuit, and repair or replace as necessary.
  4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Ignition OFF, connect the red lead of the J 38522 Variable Signal Generator to the signal circuit terminal 3 at the B198 fuel composition sensor harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  6. Set the J 38522 Variable Signal Generator Signal to 5 V, the Frequency to 60 Hz, and the Duty Cycle to Normal.
  7. Ignition ON, verify the scan tool Fuel Composition Sensor parameter is at 60 Hz. If not at the specified value, replace the K20 ECM.
  8. If all circuits test normal, test or replace the B198 fuel composition sensor.
  1. Test the fuel composition using the J 44175-A Fuel Composition Tester and the J 44175-A Instruction Manual. Record the frequency.
  2. Compare the special tool test frequency and the scan tool Fuel Composition Sensor frequency parameter. The difference between the tool and the sensor should be less than 12 Hz. If greater than the specified value, replace the B198 fuel composition sensor.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for ECM replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Alcohol content and fuel temperature information is supplied to the ECM from the fuel composition sensor. The fuel composition sensor has a battery positive circuit, a signal circuit, and a ground circuit. The fuel composition sensor uses a microprocessor inside the sensor to measure the ethanol percentage and fuel temperature, and changes output signals accordingly. The signal circuit carries both the ethanol percentage, and the fuel temperature within the same signal. The signal is both variable frequency and variable pulse width. The frequency signal indicates the ethanol percentage, and the pulse width indicates fuel temperature. The ECM provides an internal pull up to 5 V on the signal circuit, and the fuel composition sensor pulls the 5 V to ground in pulses. The normal range of operating frequency is between 50-150 Hz. The normal pulse width ranges between 1-5 milliseconds. The microprocessor inside the sensor is capable of a certain amount of self-diagnosis. An output frequency of 180 Hz indicates that the fuel is contaminated or an internal sensor fault has been detected.

  1. The ignition voltage is greater than 11 V.
  2. The DTC runs continuously when the above condition is met.

The ECM detects that the fuel composition sensor output frequency is between 155-185 Hz for greater than 6 s.

DTC P0179 is a Type B DTC.

DTC P0179 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. J 38522 Variable Signal Generator
  2. J 44175-A Fuel Composition Tester

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

  1. Engine running, verify the scan tool Fuel Composition Sensor parameter is between 50-150 Hz.
  2. 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. Verify that there are no contaminants, water, or too high of a concentration of ethanol in the fuel. Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) and the J 44175-A Instruction Manual.
  2. Ignition OFF, disconnect the harness connector at the B198 fuel composition sensor.
  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test all the components connected to the circuit, and repair or replace as necessary.
  5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. Ignition OFF, connect the red lead of the J 38522 Variable Signal Generator to the signal circuit terminal 3 at the B198 fuel composition sensor harness connector. Connect the battery voltage supply to B+, and the black lead to ground.
  7. Set the J 38522 Variable Signal Generator Signal to 5 V, the Frequency to 60 Hz, and the Duty Cycle to Normal.
  8. Ignition ON, verify the scan tool Fuel Composition Sensor parameter is at 60 Hz. If not at the specified value, replace the K20 ECM.
  9. If all circuits test normal, test or replace the B198 fuel composition sensor.
  1. Test the fuel composition using the J 44175-A Fuel Composition Tester and the J 44175-A Instruction Manual. Record the frequency.
  2. Compare the special tool test frequency and the scan tool Fuel Composition Sensor frequency parameter. The difference between the tool and the sensor should be less than 12 Hz. If greater than the specified value, replace the B198 fuel composition sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Fuel System Cleaning»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions__fuel-system-cleaning)
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP018C, P0641P018CP018D, P0641P06A6
SignalP018CP018CP018DP018B
Low ReferenceP018DP06A6

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

  1. The engine is running.
  2. DTC 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 fuel pump 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.

DTC P018B, P018C and P018D are Type A DTCs.

DTC 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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  3. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

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 P018B resets before proceeding with the circuit system testing. If the DTC does not reset, refer to diagnostic aids.

  1. Ignition OFF, disconnect the harness connector at the B47 fuel pressure sensor.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 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 K27 fuel pump flow control module.
  3. Ignition ON, test for 4.8-5.2 V between the B47 fuel pressure sensor 5 V reference circuit terminal 3 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump flow control module. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump flow control module.
  4. Verify the scan tool fuel pressure sensor voltage 1 is less than 1 V. If greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the K27 fuel pump flow control module.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3. Verify the scan tool fuel pressure sensor voltage is greater than 4.8 V. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump flow control module.
  6. If all circuits test normal, replace the B47 fuel pressure sensor.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for fuel pump control module replacement, programming and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V Reference VoltageP0192, P0193, P0641P0192P0641P0191
Fuel Rail Pressure Sensor SignalP0192P0192P0193P0191
Low ReferenceP0193, P0506P0191

The fuel rail fuel pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM monitors the voltage on the fuel rail fuel pressure sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low.

Condition 1

  1. DTC P0016, P0017, P0068, P0090, P0091, P0092, P0096, P0097, P0098, P00C8, P00C9, P00CA, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0178, P0179, P0192, P0193, P0201, P0202, P0203, P0204, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0340, P0341, P0351, P0352, P0353, P0354, P0365, P0366, P0506, P0507, P0627, P0628, P0629, P0697, P06A3, P0722, P1248, P1249, P124A, P124B, P1682, P16F3, P2101, P2122, P2123, P2127, P2128, P2135, P2138, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2269 is not set.
  2. The engine is running.
  3. The vehicle speed is less than or equal to 5 km/h (3.11 mph).
  4. DTC P0191 runs continuously when the above conditions have been met.

Condition 2 and 3

  1. DTC P0016, P0017, P0068, P0090, P0091, P0092, P0096, P0097, P0098, P00C8, P00C9, P00CA, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0178, P0179, P0192, P0193, P0201, P0202, P0203, P0204, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0340, P0341, P0351, P0352, P0353, P0354, P0365, P0366, P0506, P0507, P0627, P0628, P0629, P0697, P06A3, P0722, P1248, P1249, P124A, P124B, P1682, P16F3, P2101, P2122, P2123, P2127, P2128, P2135, P2138, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2269 is not set.
  2. The engine is running.
  3. The engine speed is between 1,000-3,000 RPM.
  4. DTC P0191 runs continuously when the above conditions have been met.

Condition 4

  1. DTC P0016, P0017, P0068, P0090, P0091, P0092, P0096, P0097, P0098, P00C8, P00C9, P00CA, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0178, P0179, P0192, P0193, P0201, P0202, P0203, P0204, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301, P0302, P0303, P0304, P0335, P0336, P0340, P0341, P0351, P0352, P0353, P0354, P0365, P0366, P0506, P0507, P0627, P0628, P0629, P0697, P06A3, P0722, P1248, P1249, P124A, P124B, P1682, P16F3, P2101, P2122, P2123, P2127, P2128, P2135, P2138, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2269 is not set.
  2. The engine is running.
  3. The engine speed is less than or equal to 2,000 RPM.
  4. DTC P0191 runs continuously when the above conditions have been met.

Condition 1

The difference between the measured high pressure and the commanded high pressure is less than or equal to -650 kPa (-94 psi) or greater than or equal to 600 kPa (87 psi) for greater than 3 s.

Condition 2

The difference between the relief pressure and the measured high pressure is less than or equal to -5000 kPa (-725 psi) for greater than 2 s.

Condition 3

The difference between the commanded high pressure and the measured high pressure is greater than or equal to 3000 kPa (435 psi) and the modeled injection pressure is greater than or equal to 3000 kPa (435 psi) for greater than 3 s.

Condition 4

The difference between the measured maximum high pressure and the measured minimum high pressure is less than or equal to 100 kPa (14.5 psi) for greater than 60 s.

  1. DTC P0191 is a Type A DTC.
  2. A message center or an indicator may display Reduced Engine Power.

DTC P0191 is a Type A DTC.

A condition with the fuel tank fuel pump module or the fuel pump control module may set this DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Observe the scan tool DTC information, verify DTC P0627, P0628, P0629, P0641, P069E or U0109 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Engine idling, observe the scan tool Fuel Rail Pressure Sensor parameter. The pressure should be approximately 1.9-2.1 Mpa (279-305 psi).
  3. Engine idling, the scan tool Fuel Rail Pressure Sensor should be close to the scan tool Desired Fuel Rail Pressure. As the engine speed increases, the Desired Fuel Rail Pressure and the Fuel Rail Pressure Sensor should closely match each other.
  4. Move related harnesses/connectors of the B47 fuel rail fuel pressure sensor and verify the engine does not stumble, stall, or change engine speed. If the engine stumbles, stalls, or changes engine speed, test or repair the suspected harness or connection.
  5. Observe the DTC information with a scan tool, DTC P0191 should not set.
  6. 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 fuel injector multi-way harness connector X160.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal 5 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 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 11 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V. If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Connect a 3 A fused jumper wire between the signal circuit terminal 12 and the 5 V reference circuit terminal 11. Verify the scan tool Fuel Rail Pressure Sensor Voltage parameter is greater than 4.96 V. If less than the specified value, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 ECM.
  6. Ignition OFF, remove the intake manifold.
  7. Connect the fuel injector multi-way harness connector X160.
  8. Disconnect the B47 fuel rail fuel pressure sensor connector.
  9. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance.
  10. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If greater than the specified range, test the 5 V reference circuit for a short to voltage.
  11. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V. If greater than the specified value, test the signal circuit for a short to voltage.
  12. Connect a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 3. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V. If less than the specified value, test the signal circuit for an open/high resistance or a short to ground.
  13. If all circuits test normal, replace the B47 fuel rail fuel pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V Reference VoltageP0192, P0193, P0641P0192P0641P0191
Fuel Rail Pressure Sensor SignalP0192P0192P0193P0191
Low ReferenceP0193, P0506P0191

The fuel rail fuel pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5 V reference circuit and ground on the reference ground circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM monitors the voltage on the fuel rail fuel pressure sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low.

  1. The engine is running.
  2. The ignition voltage is greater than 11 V.
  3. The DTCs run continuously within the enabling conditions.

P0192

The ECM detects that the fuel rail fuel pressure sensor signal voltage is low for greater than 6 s.

P0193

The ECM detects that the fuel rail fuel pressure sensor signal voltage is high for greater than 6 s.

  1. DTCs P0192 and P0193 are Type A DTCs.
  2. A message center or an indicator may display Reduced Engine Power.

DTCs P0192 and P0193 are Type A DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the DTC information with a scan tool, DTC P0641 should not be set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Engine idling, observe the DTC information with a scan tool. DTC P0192 or P0193 should not set.
  3. 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 fuel injector multi-way harness connector X160.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal 5 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 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 11 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V. If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Connect a 3 A fused jumper wire between the signal circuit terminal 12 and the 5 V reference circuit terminal 11. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V. If less than the specified value, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 ECM.
  6. Ignition OFF, remove the intake manifold.
  7. Connect the fuel injector multi-way harness connector X160.
  8. Disconnect the B47 fuel rail fuel pressure sensor connector.
  9. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 1 and ground. If greater than the specified range, test the low reference circuit for an open/high resistance.
  10. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If greater than the specified range, test the 5 V reference circuit for a short to voltage.
  11. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V. If greater than the specified value, test the signal circuit for a short to voltage.
  12. Connect a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 3. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V. If less than the specified value, test the signal circuit for an open/high resistance or a short to ground.
  13. If all circuits test normal, replace the B47 fuel rail fuel pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageShort from Supply Circuit to Control Circuit
Direct Fuel Injector High Voltage Supply Cylinder 1P2147P0201P2148P1248
Direct Fuel Injector High Voltage Control Cylinder 1P0261P0201P0262, P2148P1248
Direct Fuel Injector High Voltage Supply Cylinder 2P2150P0202P2151P1249
Direct Fuel Injector High Voltage Control Cylinder 2P0264P0202P0265, P2151P1249
Direct Fuel Injector High Voltage Supply Cylinder 3P2153P0203P2154P124A
Direct Fuel Injector High Voltage Control Cylinder 3P0267P0203P0268, P2154P124A
Direct Fuel Injector High Voltage Supply Cylinder 4P2156P0204P2157P124B
Direct Fuel Injector High Voltage Control Cylinder 4P0270P0204P0271, P2157P124B

The engine control module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injector high voltage supply circuits and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled.

  1. DTC P062B is not set.
  2. The engine is running for greater than 5 s.
  3. The ignition voltage is greater than 11 V.
  4. The DTCs run continuously once the above conditions are met.

P0201, P0202, P0203, or P0204

The ECM detects the injector high voltage supply circuit or the injector high voltage control circuit is open for greater than 2 s.

P0261, P0264, P0267, or P0270

The ECM detects the injector high voltage control circuit is shorted to ground for greater than 2 s.

P0262, P0265, P0268, or P0271

The ECM detects the injector high voltage control circuit is shorted to voltage for greater than 2 s.

P1248, P1249, P124A, or P124B

The ECM detects the injector high voltage supply circuit is shorted to the injector high voltage control circuit for greater than 2 s.

P2147, P2150, P2153, or P2156

The ECM detects the injector high voltage supply circuit is shorted to ground for greater than 2 s.

P2148, P2151, P2154, or P2157

The ECM detects the injector high voltage supply circuit is shorted to voltage for greater than 2 s.

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, and P2157 are Type A DTCs.

DTCs P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, and P2157 are Type A DTCs.

  1. Performing the fuel injector coil test may help isolate an intermittent condition. Refer to «Fuel Injector Solenoid Coil Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  2. If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Injector Control Circuit Status parameters. An Injector Control Circuit Status parameter will change from OK or Not Run to Fault if there is a condition with the circuit or a connection.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Observe the DTC information with a scan tool. DTC P0685 or P1682 should not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Engine operating, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P1248, P1249, P124A, P124B, P2147, P2148, P2150, P2151, P2153, P2154, P2156, or P2157 should not set.
  3. Observe the scan tool Current Misfire Counter parameters. The Current Misfire Counters should not increment.
  4. Ignition ON, observe the scan tool Cylinder 1-4 Injector Control Circuit Status parameters. Verify the Injector Control Circuit Status parameters display OK.
  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 fuel injector multi-way harness connector X160.
  2. Ignition ON, observe the appropriate scan tool Cylinder 1-4 Injector Control Circuit Status. The parameter should display Open. If not the specified value, test the appropriate high voltage supply circuit, ECM side, for a short to ground or the appropriate high voltage control circuit, ECM side, for a short to voltage. If the circuits test normal, replace the K20 ECM.
  3. Ignition ON, connect a test lamp between the appropriate high voltage supply circuit and the high voltage control circuit. The Injector Control Circuit Status should transition from Open to OK. If not the specified value, test for the following conditions in the ECM side of the harness: An open/high resistance in the high voltage supply circuit An open/high resistance in the high voltage control circuit A short to ground in the high voltage control circuit A short to voltage in the high voltage supply circuit If the circuits test normal, replace the K20 ECM.
  4. Ignition OFF, measure the resistance between the appropriate high voltage supply circuit and ground. The DMM should display OL ohms. If less than the specified range, test the high voltage supply circuit and the high voltage control circuit for a short to ground. If the circuits/connections test normal, test or replace the appropriate Q17 fuel injector(s).
  5. Test for 2-3 ohms between the appropriate high voltage supply circuit and high voltage control circuit. If less than the specified range, test for a short between the high voltage supply circuit and high voltage control circuit. If the circuits/connections test normal, test or replace the appropriate Q17 fuel injector(s). If greater than the specified range, test the high voltage supply circuit and high voltage control circuit for an open/high resistance. If the circuits/connections test normal, test or replace the appropriate Q17 fuel injector.
  1. «Fuel Injector Solenoid Coil Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis)
  2. «Fuel Injector Balance Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Direct Fuel Injector Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
ControlP0231P023FP0232P023F, P2635
Low ReferenceP023FP023F, P2635

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

P0231, P023F

The ignition voltage is between 9-18 V.

P0232

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

The fuel pump 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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the fuel pump ON and OFF using the scan tool ECM fuel pump output control. The fuel pump should turn ON and OFF.

  1. Ignition OFF, disconnect the harness connector at the G12 fuel pump.
  2. Connect a test lamp between the control circuit terminal 1 and ground.
  3. Ignition ON, command the ECM G12 fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF, as commanded. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K27 fuel pump control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
  4. Ignition OFF, connect a test lamp between the control circuit terminal 1 and the low reference circuit terminal 2.
  5. Ignition ON, command the G12 fuel pump ON with a scan tool. The test lamp should illuminate. If the test lamp does not illuminate, test the low reference circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K27 fuel pump control module.
  6. If all circuits test normal, replace the fuel tank G12 fuel pump module.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Fuel Tank Fuel Pump Module Replacement (NU6)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) , «Fuel Tank Fuel Pump Module Replacement (NT7)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for fuel pump control module replacement, programming and setup
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5 V ReferenceP0107, P0193, P0236, P0642P0236, P0237P0107, P0236P0036, P0193, P0236, P050A, P0606, P0643P0236
Intake Air Pressure SignalP0237P0236, P0237P0238P0238P0234, P0236, P0299
Low ReferenceP0234, P0236, P0238P0098, P0099, P0238
CircuitShort to GroundOpenShort to Voltage
Parameter Normal Range: BARO to 240 kPa Operating Conditions: Engine running under various operating conditions
5 V Reference20-80 kPa30-80 kPa20-80 kPa
Boost Pressure Sensor0 kPa276 kPa276 kPa
Low Reference276 kPa

Boost Pressure Sensor

The intake air pressure sensor is integrated with the intake air temperature (IAT) sensor 2. The intake air 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, on the intake air pressure signal circuit. 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 vehicle is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa. The least pressure that occurs is when the vehicle is idling or decelerating, and it is equal to the BARO.

  1. DTC P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0033, P0034, P0035, P00C0, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0121, P0122, P0123, P0128, P0222, P0223, P0234, P0236, P0237, P0238, P0243, P0245, P0246, P0299, P0606, P16F3, P2101, P2227, P2228, P2229, P2230 or P2261 is not set.
  2. The driver requested boost pressure level exceeds the level of the base boost pressure.
  3. The engine speed is between 1600-6000 RPM.
  4. The desired boost pressure is between 140-300 kPa.
  5. The Barometric Pressure (BARO) is between 60-120 kPa.
  6. The Engine Coolant Temperature (ECT) is between -40-120°C (-40-248°F).
  7. The Intake Air Temperature (IAT) is between -40-80°C (-40-176°F)
  8. The turbocharger wastegate is not under output device control.
  9. The turbocharger bypass valve is not under output device control.
  10. The DTCs run continuously when the above conditions have been met.

P0234

The ECM detects that the actual boost pressure is greater than the desired boost pressure by a calibrated amount for greater than 1.5 s.

P0299

The ECM detects that the actual boost pressure is less than the desired boost pressure by a calibrated amount for greater than 1.5 s.

  1. DTCs P0234 and P0299 are Type B DTCs.
  2. An indicator will illuminate.
  3. 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 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 ductwork, the tightening specifications and proper positioning of the clamps is critical, and must be strictly adhered to.
  2. Use a solution of dish soap and water in a spray bottle to pinpoint any air leaks.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, command the Turbocharger Bypass Solenoid ON and OFF with a scan tool. A click should be heard and felt in response to the commands.
  2. Command the Turbocharger Wastegate Solenoid between 20-90 % with a scan tool. A series of clicks should be heard and felt in response to the commands.
  3. Ignition ON, observe the scan tool MAP Sensor, Boost Pressure Sensor and BARO Sensor parameters. Compare the parameters to the «Altitude Versus Barometric Pressure»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__altitude-versus-barometric-pressure) table. The parameters should be within the range specified in the table for the current altitude.
  4. Compare the scan tool MAP Sensor parameter to the Boost Pressure Sensor parameter during a WOT acceleration at the time of the 1-2 shift. The readings should be within 20 kPa.
  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. Verify the integrity of the entire air induction and exhaust systems, including all turbocharger components, by inspecting for the following conditions: Damaged components Hairline fractures of the boost pressure sensor housing Hairline fractures of the MAP sensor housing Loose or improper installation An air flow restriction Vacuum line restrictions Vacuum leaks An air leak between the turbocharger and the throttle body, including the charge air cooler assembly. Verify that an exhaust leak does not exist, including the mating surface area between the turbocharger and the exhaust manifold. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system) If a condition is found, repair or replace the affected component as necessary.
  2. If all inspections are normal, test or replace the B65 intake air pressure and temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Intake Air Pressure and Temperature Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for ECM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
5-Volt ReferenceP0107, P0193, P0236P0236, P0237P0107, P0236P0036, P0193, P0236, P0606P0236
Intake Air Pressure SignalP0237P0236, P0237P0238P0238P0234, P0236, P0299
Low ReferenceP0234, P0236, P0238P0098, P0099, P0238
CircuitShort to GroundOpenShort to Voltage
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: BARO to 240 kPa
5 V Reference20-80 kPa30-80 kPa20-80 kPa
Boost Pressure Sensor0 kPa276 kPa276 kPa
Low Reference276 kPa

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. The pressure is equal to the BARO when the engine is idling or decelerating.

P0236

  1. DTC P0106, P0107, P0108, P0237, P0238, P2227, P2228, P2229, P2230 or P2610 is not set.
  2. Ignition is ON.
  3. The time between current ignition cycle and the last time the engine was running is greater than 10 s.
  4. The DTC runs continuously when the above conditions have been met. OR
  5. DTC P0097, P0098, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0222, P0223, P0237, P0238, P0335, P0336, P2227, P2228, P2229 or P2230 is not set.
  6. Engine speed is between 400-6,000 RPM.
  7. Engine Coolant Temperature (ECT) is between -7 to +125°C (19.4-257°F).
  8. Intake Air Temperature (IAT) is between -20 to +125°C (-4 to +257°F).
  9. The DTC runs continuously when the above conditions have been met.

P0237 and P0238

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

P0236

  1. The ECM detects that the boost pressure sensor signal is not within range of a model derived from the BARO sensor, the MAP sensor, the throttle position sensor and the boost pressure sensor when the engine is running. OR
  2. The ECM detects that the boost pressure sensor signal is less than 50 kPa or greater than 115 kPa when the ignition is ON and the engine is NOT rotating.

P0237

The ECM detects that the boost pressure sensor voltage is less than 0.09 V for greater than 5 s .

P0238

The ECM detects that the boost pressure sensor voltage is greater than 3.9 V for greater than 5 s .

  1. DTCs P0236, P0237, 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 P0236, P0237, P0238 are Type B DTCs.

  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

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that DTC P0641, P0651, P0697, or P06A3 is not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Ignition ON, observe the scan tool MAP Sensor, Boost Pressure Sensor and the BARO Sensor parameters. Compare the parameters to the «Altitude Versus Barometric Pressure»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__altitude-versus-barometric-pressure) table. The parameters should be within the range specified in the table for the current altitude.
  3. Engine idling, observe the scan tool Boost Pressure Sensor and the BARO Sensor parameters. The parameters should be within 4 kPa.
  4. Compare the scan tool MAP Sensor and Boost Pressure Sensor parameters during a WOT acceleration at the time of the 1-2 shift. The readings should be within 20 kPa.
  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. Verify the integrity of the entire air induction and exhaust systems including all turbocharger components by inspecting for the following conditions: Damaged components Hairline fractures of the boost pressure sensor housing Hairline fractures of the MAP sensor housing Loose or improper installation An air flow restriction Vacuum line restrictions Vacuum leaks An air leak between the turbocharger and the throttle body, including the charge air cooler assembly. Verify that an exhaust leak does not exist, including the mating surface area between the turbocharger and the exhaust manifold. Verify that restrictions do not exist in the exhaust system. Refer to «Restricted Exhaust»(/buick/regal/v-2009-2013/remont/exhaust/#engine-exhaust-system) If a condition is found, repair or replace the affected component as necessary.
  2. Ignition OFF, disconnect the harness connector at the B111B turbocharger boost/intake air temperature sensor.
  3. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal 1 or A 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, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 or C and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  5. Verify the scan tool Boost Pressure Sensor parameter is greater than 275 kPa. If less than the specified range, test the signal circuit terminal 4 or D for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  6. Install a 3 A fused jumper wire between the signal circuit terminal 4 or D and the low reference circuit terminal 1 or A. Verify the scan tool Boost Pressure Sensor parameter is less than 1 kPa. If greater 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.
  7. If the circuits test normal, 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/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) for turbocharger boost/intake air temperature sensor replacement.
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundHigh ResistanceOpenShort to VoltageSignal Performance
Ignition VoltageP0010, P0013, P0033, P0034, P0245P0243P0243, P0245
Turbocharger Wastegate Solenoid ControlP0245P0243P0243P0246P0243

The BorgWarner™ dual-scroll turbocharger incorporates a wastegate that is controlled by the engine control module (ECM) by means of a pulse width modulation (PWM) solenoid, to regulate the pressure ratio of the compressor. An ECM controlled compressor bypass valve, which uses a remotely mounted solenoid, is integrated into the unit to prevent compressor surging and damage from vibrations by opening during abrupt closed throttle conditions. The bypass valve is open during closed throttle deceleration conditions to allow air to recirculate in the turbocharger and maintain compressor speed. The valve closes, within a calibrated range, during closed throttle events or wide open throttle commands, to optimize turbo response.

As engine load and RPM increase, the turbocharger bypass solenoid valve is commanded ON by the ECM. As soon as the throttle closes, the solenoid is commanded OFF to allow the bypass valve to open and allow the turbocharger air to recirculate to prevent compressor surging.

  1. Ignition is ON or the engine is running.
  2. Battery voltage is between 11-32 V.
  3. The DTCs 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 wastegate solenoid control circuit for greater than 2 s.

  1. DTCs P0243, P0245, and P0246 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 P0243, P0245, and P0246 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Command the Turbocharger Wastegate Solenoid between 0-100 % with a scan tool. A series of clicks should be heard and felt when the command is between 20-90 % .
  2. Command the Turbocharger Bypass Solenoid Valve between 0-10 % several times with a scan tool while observing the following control circuit status parameters: 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 Each parameter should toggle between OK and Not Run
  3. 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 Q42 turbocharger wastegate solenoid valve.
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 1 or A and ground. If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 or B and ground. If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  4. Connect a test lamp between the control circuit terminal 2 or B and the voltage supply circuit terminal 1 or A.
  5. Command the Turbocharger Wastegate Solenoid parameter to 50 % with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50 % and turn OFF when commanded to 0 %. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module. If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If the circuits test normal, test or replace the Q42 turbocharger wastegate solenoid valve.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Turbocharger Wastegate Regulator Solenoid Valve Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen or High ResistanceShort to VoltageSignal Performance
FPCM ControlP025AP025AP025A

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

The ignition is ON.

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

DTC P025A is a Type A DTC.

DTC P025A is a Type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the K27 fuel pump control module.
  2. Ignition OFF, connect a test lamp between the control circuit terminal 13 and ground.
  3. Ignition ON, command the ECM fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  4. If all circuits test normal, replace the K27 fuel pump control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/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 sensors in order to determine when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect individual misfire events. A misfire rate that is high enough can cause 3-way catalytic converter damage. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for catalytic converter damage are present. DTCs P0301 through P0304 correspond to cylinders 1 through 4. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder will set, and the corresponding fuel injector is disabled. The ECM will re-enable the fuel injector after 3 crankshaft revolutions (6 for manual transmission vehicles) to determine if a misfire is still present and either disable for 3 crankshaft revolutions (6 for manual transmission vehicles) again or stay enabled, depending on whether the misfire is still present.

  1. DTC 0010, P0011, P0013, P0014, P0016, P0017, P0068, P00C8, P00C9, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0117, P0118, P0119, P0122, P0123, P0191, P0192, P0193, P0222, P0223, P0335, P0336, P0340, P0341, P0365, P0366, P0606, P0651, P16F3, P2101, P2135, P2227, P2228, P2229, or P2230 is not set. AND
  2. DTC P0806, P0807, or P0808 is not set; with manual transmission.
  3. The engine speed is between 450 and 6,550 RPM. OR
  4. The engine speed is greater than 1,000 RPM and DTC P0315 is set.
  5. The engine coolant temperature (ECT) is between -7 and +125°C (19 and 257°F).
  6. If the ECT is colder than -7°C (+19°F) at start-up, this diagnostic will not run until the ECT is between 21 and 125°C (69 and 257°F).
  7. The ignition voltage is between 9 and 32 V.
  8. The vehicle is not in a decell condition.
  9. The ECM is not receiving a rough road signal.
  10. The fuel level is at least 11 %.
  11. The ECM is not in fuel cut-off or decel fuel cut-off mode.
  12. DTCs P0300 through P0304 run continuously when the above conditions exist for at least 1,000 engine revolutions. 200 revolutions after the first failure.

P0300

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

P0301, P0302, P0303, 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-P0304 are Type B DTCs.
  2. The ECM disables the fuel injector of the misfiring cylinder when a misfire is present.

DTCs P0300-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 A damaged accessory drive component or belt; remove the belt and safely operate the engine to evaluate.
  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.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  5. «Powertrain Component Views»(/buick/regal/v-2009-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-powertrain-component-views)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Special Tools

  1. «J 38522»(/buick/regal/v-2009-2013/remont/automatic-trans/#automatic-transmission-6t406t456t50-special-tools-and-equipment)
  2. For equivalent regional tools, refer to «Special Tools (Diagnostic Tools)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-special-tools-and-equipment__special-tools-diagnostic-tools) .
  1. Engine idling at the normal operating temperature. Verify there is no abnormal engine noise. If there is an abnormal engine noise, refer to «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) .
  2. Verify that no other DTCs are set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  3. Observe the scan tool Misfire Current Cyl. 1-4 parameters. The Misfire Current Counters should not be incrementing.
  4. Engine idling, perform the Cylinder Power Balance test with a scan tool to isolate the misfiring cylinder. The engine speed should change when each injector is disabled.
  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. Perform the «Crankshaft Position System Variation Learn»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions__crankshaft-position-system-variation-learn) procedure. The scan tool should display Learned Successful. If the Crankshaft Position System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions and repair as necessary: Worn crankshaft main bearings A damaged or misaligned reluctor wheel Excessive crankshaft runout A damaged crankshaft-Refer to «Crankshaft and Bearing Cleaning and Inspection»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-off-vehicle__crankshaft-and-bearing-cleaning-and-inspection) . Interference in the signal circuit of the crankshaft position sensor The ignition switch is in the ON position until there is insufficient system voltage. An ECM power disconnect with the ignition ON that may have erased the crankshaft position system variation values and set DTC P0315 Debris between the crankshaft position sensor and the reluctor wheel
  2. Verify the Learn Procedure is successful. If the ECM is unable to complete the learn procedure, replace the ECM.
  3. Verify that the following conditions do not exist: 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»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) . Contaminated fuel-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) . Exhaust system restrictions If you find any of the above conditions, repair as necessary.
  4. Ignition OFF, remove the T8 ignition coil of the misfiring cylinder, but leave the electrical connector connected.
  5. Inspect the ignition coil boot for the following conditions: Holes Tears Carbon tracking Oil contamination Water intrusion If you find any of the above conditions, repair as necessary.
  6. Install the «J 26792»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-special-tools-and-equipment__special-tools-diagnostic-tools) to the boot of the appropriate T8 ignition coil and ground.
  7. Attempt to start the engine and observe the «J 26792»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-24l-special-tools-and-equipment__special-tools-diagnostic-tools) . The spark tester should spark. If there is no spark, refer to «Electronic Ignition System Diagnosis»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) for diagnosis of the ignition coil.
  8. Ignition OFF, remove the spark plug from the misfiring cylinder. Verify that the spark plug does not exhibit the following conditions: Gas, coolant, or oil fouled-Refer to «Spark Plug Inspection»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions__spark-plug-inspection) . Cracked, worn, incorrectly gapped-Refer to «Ignition System Specifications»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-specifications__ignition-system-specifications) . If there is a condition with the spark plug, replace the spark plug.
  9. Exchange the suspected spark plug with another cylinder that is operating correctly.
  10. Operate the engine under the conditions in which the misfire occurred. Observe the Misfire Current Cyl. 1-4 parameters with a scan tool. The misfire should not follow the spark plug exchange. If the misfire follows the spark plug, replace the spark plug.
  11. If all conditions test normal, test or inspect for the following: A lean or rich Q17 fuel injector-Refer to «Fuel Injector Solenoid Coil Test»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) .
  1. «Ignition Coil Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Spark Plug Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) and perform the appropriate diagnostic procedure.
  6. Engine idling, observe the Misfire Current Cyl. 1-4 parameters with a scan tool. The misfire counter parameters should not be incrementing. If the misfire counter parameters are incrementing, a misfire 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/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0315: Crankshaft Position System Variation Not Learned

The crankshaft position 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 conditions.

The crankshaft position system variation compensating values are stored in ECM memory after a learn procedure has been performed and the ignition switch is turned to the OFF position for at least 30 s. If the actual variation is not within the crankshaft position system variation compensating values stored in the ECM, DTC P0300 may set.

If the crankshaft position system variation values are not stored in the ECM memory or a proper ECM power down does not occur after completing the Crankshaft Position Learn Procedure, DTC P0315 sets.

DTC P0315 runs continuously.

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

DTC P0315 is a Type A DTC.

DTC P0315 is a Type A DTC.

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

Schematic Reference

Connector End Views

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

Note. The Crankshaft Position Variation Learn may have to be repeated up to 5 times before the procedure is successful.

  1. Perform the «Crankshaft Position System Variation Learn»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions__crankshaft-position-system-variation-learn) procedure. The scan tool should display Learned Successful. If the Crankshaft Position System Variation Learn Procedure cannot be performed successfully, inspect for the following conditions and repair as necessary: Worn crankshaft main bearings A damaged or misaligned reluctor wheel Excessive crankshaft runout A damaged crankshaft-Refer to «Crankshaft and Bearing Cleaning and Inspection»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-repair-instructions-off-vehicle__crankshaft-and-bearing-cleaning-and-inspection) . Interference in the signal circuit of the crankshaft position sensor The ignition switch is in the ON position until there is insufficient system voltage. An ECM power disconnect with the ignition ON that may have erased the crankshaft position system variation values and set DTC P0315 Debris between the crankshaft position sensor and the reluctor wheel
  2. Verify the Learn Procedure is successful. If the ECM is unable to complete the learn procedure, replace the ECM.

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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Knock Sensor 1 SignalP0327P0325P0328P0326
Knock Sensor 2 SignalP0332P0330P0333P0331
Knock Sensor 1 Low ReferenceP0327P0325, P06B6P0328P0326
Knock Sensor 2 Low ReferenceP0332P0330, P06B7P0333P0331

The knock sensors enable 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 sensors produce 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 two knock sensor signals. The ECM receives the two knock sensor signals through 2 isolated circuits. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges. The ECM monitors for a normal knock sensor signal. The ECM monitors the two internal knock sensor processors by verifying a 20 KHz signal generated on the signal circuits is detected on the sensors' low reference circuits.

P0324, P0326, and P0331-Condition 1

  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).
  5. The DTCs run continuously when the above conditions are met.

P0326 and P0331-Condition 2

  1. Engine speed is greater than 2,200 RPM.
  2. Engine is running for greater than 1 s.
  3. The ECT is warmer than -40°C (-40°F).
  4. The IAT sensor 1 is warmer than -40°C (-40°F).
  5. The DTCs run continuously when the above conditions are met.

P06B6 and P06B7

  1. Engine speed is between 400 and 3,500 RPM.
  2. Engine is running greater than 2 s.
  3. The DTCs run continuously when the above conditions are met.

P0324

The ECM detects that the knock sensor signal's performance is out of the normal expected range due to an excessive engine knock, or abnormal noise, or a flat signal; in at least a single cylinder.

P0326 and P0331

  1. The ECM detects that the knock sensor signal indicates the sensor harness is connected, but the sensor is not properly bolted to the engine. OR
  2. The ECM detects that the knock sensor signal indicates an excessive engine knock is present.

P06B6 and P06B7

The ECM has detected an internal knock sensor processor fault.

  1. DTCs P0324, P0326, P0331, P06B6, and P06B7 are Type B DTCs.
  2. The ignition timing is retarded to reduce the potential of engine damaging spark knock.

DTCs P0324, P0326, P0331, P06B6, and P06B7 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running, observe the DTC information with a scan tool. Verify DTC P0325, P0327, P0328, P0330, P0332, P0333, P06B6, and P06B7 is not set. If DTC P0325, P0327, P0328, P0330, P0332, or P0333 is set with P06B6 or P06B7 refer to «DTC P0325, P0327, P0328, P0330, P0332, or P0333»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0010-to-dtc-p0336) for further diagnosis. If only DTC P06B6 or P06B7 is set, and no external knock sensor circuit issues exist, replace the K20 ECM.
  2. Vehicle OFF, inspect for the following: The affected B68 knock sensor for physical damage. A sensor that is dropped or damaged may cause a DTC to set The sensor for proper installation. A sensor that is loose or not at the correct torque may cause a DTC to set. Refer to «Fastener Tightening Specifications»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-specifications__fastener-tightening-specifications) . The sensor mounting surface for burrs, casting flash, and foreign material The sensor must be clear of hoses, brackets, and engine electrical wiring Loose brackets Loose or broken accessory drive belts, brakcets, components An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-diagnostic-information-and-procedures) If a condition is found, repair as necessary.
  3. If there is no mechanical condition, test or replace the B68 knock sensor.
  4. 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.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Knock Sensor Replacement (Right Side)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) , «Knock Sensor Replacement (Left Side)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, programming, and setup.g
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Knock Sensor 1 SignalP0327P0325P0328P0326
Knock Sensor 2 SignalP0332P0330P0333P0331
Knock Sensor 1 Low ReferenceP0327P0325, P06B6P0328P0326
Knock Sensor 2 Low ReferenceP0332P0330, P06B7P0333P0331

The knock sensors enable 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 sensors produce 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 two knock sensor signals. The ECM receives the two knock sensor signals through 2 isolated circuits. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges. The ECM monitors for a normal knock sensor signal. The ECM monitors the two internal knock sensor processors by verifying a 20 KHz signal generated on the signal circuits is detected on the sensors' low reference circuits.

P0325 and P0330

  1. Engine speed is between 400 and 8,500 RPM.
  2. Engine is running at least 2 s.
  3. The ECT is warmer than -40°C (-40°F).
  4. The IAT sensor 1 is warmer than -40°C (-40°F).
  5. The DTCs run continuously when the above conditions are met.

P0327, P0328, P0332, and P0333

  1. Engine speed is less than 8,500 RPM.
  2. The DTCs run continuously when the above condition is met.

P0325 and P0330

The ECM detects that a knock sensor signal circuit is open for longer than 6 s.

P0327 and P0332

The ECM detects that a knock sensor signal circuit is shorted to ground for longer than 6 s.

P0328 and P0333

The ECM detects that a knock sensor signal circuit is shorted to voltage for longer than 6 s.

  1. DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.
  2. The ignition timing is retarded to reduce the potential of engine damaging spark knock.

DTCs P0325, P0327, P0328, P0330, P0332, and P0333 are Type B DTCs.

  1. Inspect the affected knock sensor for physical damage. A sensor that is dropped or damaged may cause a DTC to set.
  2. The sensor mounting surface must be free of burrs, casting flash, and foreign material.
  3. The sensor must be clear of hoses, brackets, and engine electrical wiring.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  2. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  3. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  4. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Engine running, observe the DTC information with a scan tool. Verify DTC P0325, P0327, P0328, P0330, P0332, P0333, P06B6, and P06B7 are not set. If DTC P0325, P0327, P0328, P0330, P0332, or P0333 is set with P06B6 or P06B7 continue with Circuit/System Testing. If only DTC P06B6 or P06B7 is set, and no external knock sensor circuit issues exist, replace the K20 ECM.
  2. Move the related harnesses and connectors for the affected knock sensor circuits while observing the scan tool parameters listed below. The parameters should display NO. Cylinder 1 Knock Detected Cylinder 2 Knock Detected Cylinder 3 Knock Detected Cylinder 4 Knock Detected Cylinder 5 Knock Detected Cylinder 6 Knock Detected If the parameters change, repair the wiring or the harness connectors.
  3. Observe the DTC information with a scan tool. DTC P0325, P0327, P0328, P0330, P0332, or P0333 should not set.
  4. 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. Verify the affected B68 knock sensor is properly tightened, refer to «Fastener Tightening Specifications»(/buick/regal/v-2009-2013/remont/mechanical/#engine-mechanical-20l-specifications__fastener-tightening-specifications) . If not the specified value, correct the condition as appropriate.
  2. Vehicle OFF, disconnect the harness connector at the B68 knock sensor.
  3. Ignition ON, measure for 1-4 V between each of the following circuits and ground on the K20 ECM side of the harness connector: The signal circuit, terminal 1 The low reference circuit, terminal 2 If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the K20 ECM. If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the K20 ECM.
  4. If all circuits test normal, replace the B68 knock sensor.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Knock Sensor Replacement (Right Side)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions) , «Knock Sensor Replacement (Left Side)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/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/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
5 V ReferenceP0335, P0651P0335P0335, P0651P0336
Crankshaft Position Sensor SignalP0335P0335P0335P0336
Low ReferenceP0335P0336

The crankshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an output signal circuit. The crankshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The crankshaft position sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the crankshaft position sensor output depends on the velocity of the crankshaft. The crankshaft position sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the crankshaft position sensor. The ECM uses each crankshaft position signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses crankshaft position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and to detect cylinder misfire.

P0335 Condition 1

  1. The starter is engaged and the engine control module detects camshaft position sensor pulses. OR
  2. DTCs P0101, P0102 and P0103 are not set.
  3. The airflow into the engine is greater than 3 g/s.

Condition 2

  1. DTC P0651 is not set.
  2. The engine is running.

Condition 3

  1. The engine is running. OR
  2. DTCs P0365, P0366, P0641, and P0651, are not set.
  3. The starter is engaged.

P0336 Condition 1

  1. DTCs P0335 or P0651 are not set.
  2. The airflow into the engine is greater than 3 g/s.
  3. Engine speed is greater than 450 RPM.

Condition 2

  1. DTC P0651 is not set.
  2. The engine is running and the starter is not engaged.

Condition 3

  1. The starter is engaged and the engine control module detects camshaft position sensor pulses. OR
  2. DTCs P0101, P0102, and P0103 are not set.
  3. The airflow into the engine is greater than 3 g/s.

Condition 4

  1. The engine is running. OR
  2. DTCs P0365, P0366, P0641, and P0651, are not set.
  3. The engine is not running and the starter is engaged.

The DTCs run continuously once the above conditions are met.

P0335 Condition 1

The ECM does not detect a crankshaft position sensor pulse for greater than 4 s.

Condition 2

The ECM does not detect a crankshaft position sensor pulse for greater than 1.0 s.

Condition 3

The ECM does not detect a crankshaft position sensor pulse for 2 failures out of 10 samples.

P0336 Condition 1

The ECM detects that 20 or more crankshaft resynchronization have occurred within 25.0 s.

Condition 2

The ECM does not detect the synchronization gap on the reluctor wheel for greater than 0.4 s.

Condition 3

The ECM does not detect the synchronization gap on the reluctor wheel for 1.5 s after the starter was engaged.

Condition 4

The ECM detects less than 51 or greater than 65 crankshaft position sensor pulses, during one engine revolution.

DTCs P0335 and P0336 are Type B DTCs.

DTCs P0335 and P0336 are Type B DTCs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, observe the DTC information with a scan tool. DTC P0651 should not be set. If the DTC is set, refer to «DTC P0641, P0651, P0697, or P06A3 (ECM)»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-dtc-p0340-through-dtc-p2635-and-symptom-troubleshooting-diagnosis) .
  2. Clear the DTC information with a scan tool. Attempt to start the engine. Observe the DTC information with a scan tool. DTC P0335 or P0336 should not set.
  3. Engine idling, observe the scan tool Crankshaft Position Resync Counter parameter. The parameter should always display zero. Move the related harnesses/connectors of the B26 crankshaft position sensor while observing the parameter. Verify the engine does not stumble or stall, and the parameter does not increment.
  4. 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 B26 crankshaft position sensor.
  2. Ignition OFF, all vehicle systems OFF. It may take up to 2 minutes for all systems to power down. 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.
  3. Ignition ON, engine OFF, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  4. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  5. Ignition OFF, connect a 3 A fused jumper wire to signal circuit terminal 3.
  6. Ignition ON, momentarily touch the other end of the fused jumper wire to ground repeatedly while monitoring the scan tool Crankshaft Position Sensor Active Counter parameter. The Crankshaft Position Active Counter should increment. If the Crankshaft Position Active Counter does not increment, replace the K20 engine control module.
  7. DTC P0336 should not be set. If DTC P0336 is set, inspect the engine for the conditions listed below and repair as necessary: Excessive play or looseness of the CKP sensor or the reluctor wheel Improper installation of the CKP sensor Foreign material passing between the CKP sensor and the reluctor wheel Excessive air gap between the CKP sensor and the reluctor wheel Engine oil for debris Timing chain, tensioner, and sprockets for wear or damage
  8. If all circuits and components test normal, test or replace the B26 crankshaft position sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic repair.

  1. «Crankshaft Position Sensor Replacement»(/buick/regal/v-2009-2013/remont/testing-diagnostics/#engine-controlsfuel-20l-repair-instructions)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for replacement, programming and setup

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics
• COMPONENT CONNECTOR END VIEWS -- INDEX
• 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 SENSOR REPLACEMENT - INTAKE
• Camshaft Position Exhaust Actuator Replacement
• Throttle Body Cleaning
• Restricted Exhaust
• DTC P0641, P0651, P0697, or P06A3 (ECM)
• Altitude Versus Barometric Pressure
• Symptoms - Engine Mechanical
• Temperature Versus Resistance - Intake Air Temperature Sensor (Hitatchi Sensor)
• J 38522
• Special Tools (Diagnostic Tools)
• Checking Aftermarket Accessories
• Cooling System Leak Testing
• Cooling System Draining and Filling (Static Fill)
• Temperature Versus Resistance (ECT)
• Temperature Versus Resistance (IAT)
• Temperature Versus Resistance (IAT 2)
• Thermostat Diagnosis
• Engine Coolant Temperature Sensor Replacement
• Exhaust Leakage
• Loss of Coolant
• Symptoms - Engine Exhaust
• Crankcase Ventilation System Inspection/Diagnosis (With Turbocharger)
• Fuel System Cleaning
• Powertrain Component Views
• Crankshaft Position System Variation Learn
• Crankshaft and Bearing Cleaning and Inspection
• J 26792
• Spark Plug Inspection
• Ignition System Specifications
• Battery Inspection/Test
• Fastener Tightening Specifications
• DTC P0106

More articles — Engine Performance