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Home/Chevrolet/Camaro/Chevrolet Camaro V (2009-2013)/Repair manual/Testing & Diagnostics/Engine Controls and Fuel - 3.6l - DTC p0627 Through p2544
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Engine Controls and Fuel - 3.6l - DTC p0627 Through p2544 Chevrolet Camaro V

Testing & Diagnostics ~15262 words

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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
Fuel Pump EnableP0628, P069EP0627, P069EP0629

Circuit/System Description

The engine control module (ECM) provides ignition voltage to the fuel pump flow control module whenever the engine is cranking or running. The control module enables the fuel pump flow control module as long as the engine is cranking or running, and ignition system reference pulses are received. While this enable voltage is being received, the fuel pump flow control module supplies a varying voltage to the in-tank fuel pump module in order to maintain the desired fuel line pressure.

Conditions for Running the DTC

  1. The engine speed is greater than 0 RPM.
  2. The ignition voltage is greater than 10 V.
  3. The DTCs run continuously when the conditions above are met.

The ECM detects the fuel pump enable circuit voltage is 2.21-2.74 V when the enable circuit is commanded OFF. The condition exists for 0.1 second.

P0628

The ECM detects the fuel pump enable circuit voltage is less than 2.21 V when the enable circuit is commanded ON. The condition exists for 0.5 second.

P0629

The ECM detects the fuel pump enable circuit voltage is greater than 2.21 V when the enable circuit is commanded OFF. The condition exists for 0.1 second.

Action Taken When the DTC Sets

DTCs P0627, P0628, and P0629 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0627, P0628, and P0629 are Type B DTCs.

Reference Information

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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. Attempt to start the engine. Observe the DTC information with a scan tool. DTC P0627, P0628, or P0629 should not set.
  2. Ignition ON, command the ECM Fuel Pump Enable ON and OFF with a scan tool while observing the following control circuit status parameters: Fuel Pump Enable Circuit Low Voltage Test Status Fuel Pump Enable Circuit Open Test Status Fuel Pump Enable Circuit High 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.

Circuit/System Testing

  1. Ignition OFF, disconnect the K27 fuel pump control module harness connector.
  2. Connect a test lamp between the enable circuit terminal 20 of the fuel pump control module and ground.
  3. Ignition ON, command the ECM Fuel Pump Enable ON and OFF with a scan tool. The test lamp should turn ON and OFF as commanded. If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the enable circuit. If circuit/connections test normal, replace the K20 ECM. If the test lamp remains ON all the time, test for a short to voltage on the enable circuit. If circuit/connections test normal, replace the K20 ECM.
  4. Ignition ON, test for 2-3 V on the enable circuit terminal 20 of the fuel pump control module. If not within the specified range, replace the K20 ECM.
  5. If all circuits/connections test normal, replace the K27 fuel pump control module.

Repair Procedures

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»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM).

  1. The engine is running or cranking.
  2. The ignition voltage is between 8-18 V.
  3. DTC P062B runs continuously when the conditions are met for greater than 500 mS.

Conditions for Setting the DTC

The ECM detects a condition with the integrated circuits of the fuel injector driver module or a short to ground on a fuel injector circuit for greater than 4 s, or a cumulative of 30 s.

DTC P062B is a Type B DTC.

DTC P062B is a Type B DTC.

Description and Operation

DTC Type Reference

Test the fuel injector high voltage supply circuits and the fuel injector high voltage control circuits for a short to ground.

  1. If all circuits test normal, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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
Motor Control 1P2100, P2101P2100, P2101, P2119P2100, P2101, P2119P0123, P2101P0638, P2101, P2119
Motor Control 2P2100, P2101, P2119P2100, P2101P2100, P2101, P2119P2101P0638, P2101, P2119

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position sensors 1 and 2 to determine the actual throttle valve position.

Conditions for Running the DTCs

P0638

  1. The ignition is ON or the engine is operating.
  2. The ignition voltage is greater than 7 V.
  3. DTC P0638 runs continuously when the above conditions are met for greater than 1 s.

P2100

  1. The ECM is active.
  2. DTC P2100 runs continuously when the above condition is met.

P2101

  1. The ignition is ON or the engine is operating.
  2. The ignition voltage is greater than 7 V.
  3. Throttle position adaptation is not active.
  4. DTCs P2101 run continuously when the above conditions are met.

P2119

  1. DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0700, P2122, P2123, P2127, P2128, or P2138 is not set.
  2. The ignition is ON.
  3. The vehicle speed is 0 km/h (0 mph).
  4. The engine speed is less than 40 RPM.
  5. The engine coolant temperature (ECT) is 5-100°C (41-212°F).
  6. The intake air temperature (IAT) is 5-143°C (41-290°F).
  7. The ignition voltage is greater than 10 V.
  8. The accelerator pedal position (APP) is less than 15 %.
  9. DTC P2119 runs once per ignition cycle when the above conditions are met for less than 1 s.

P0638

  1. The ECM detects that the commanded duty cycle for the range test high is greater than 80 %. OR
  2. The ECM detects that the commanded duty cycle for the range test low is greater than 80 %.
  3. Either condition exists for greater than 1 s, or a cumulative of 10 s.

P2100

The ECM detects the output circuit for the TAC motor is open, shorted to ground, or shorted to a voltage. The condition exists, then a 5 s delay for MIL ON.

P2101

The ECM detects a 4-50 % difference between the commanded and the actual throttle plate position, dependant upon the rate of commanded throttle movement. The condition exists, then a 5 s delay for MIL ON.

P2119

The ECM determines that the throttle valve did not return to the rest position within 500 mS. The condition exists, then a 5 s delay for MIL ON.

  1. DTCs P2100, P2101, and P2119 are Type A DTCs.
  2. DTC P0638 is a Type B DTC
  1. DTCs P2100, P2101, and P2119 are Type A DTCs.
  2. DTC P0638 is a Type B DTC

Diagnostic Aids

Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 34730-405: Injector Test Lamp
  2. For equivalent regional tools, refer to «Special Tools»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-special-tools-and-equipment) .
  1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0121, P0122, P0123, P0221, P0222, or P0223 is not set. If a DTC is set refer to «DTC P0121-P0123 or P0221-P0223»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) for further diagnosis.
  2. Observe the scan tool throttle position sensor parameters. Verify that throttle position sensor 1 voltage is between 3.02-4.00 V, and throttle position sensor 2 voltage is between 1.00-1.86 V. If either throttle position sensor voltage is not within the specified range refer to «DTC P0121-P0123 or P0221-P0223»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) for further diagnosis.
  3. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release the pedal. Repeat the procedure several times. DTCs P0638, P2100, P2101, or P2119 should not set. If a DTC P0121, P0122, P0123, P0221, P0222, or P0223 set while performing this procedure refer to «DTC P0121-P0123 or P0221-P0223»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) for further diagnosis.
  4. Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. DTC P0638, P2100, P2101, or P2119 should not set. If a DTC P0121, P0122, P0123, P0221, P0222, or P0223 set while performing this procedure, refer to «DTC P0121-P0123 or P0221-P0223»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) for further diagnosis.
  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. Inspect the Q38 throttle body for the following conditions: A throttle blade that is not in the rest position A throttle valve that is binding open or closed A throttle valve that opens or closes without spring pressure If a condition is found, replace the Q38 throttle body.
  2. Ignition OFF, disconnect the harness connector of the Q38 throttle body.
  3. Ignition ON, test for 4.0-5.0 V between the TAC motor control 1 circuit terminal B and ground. If voltage is greater than the specified range, test each of the motor control circuits for a short to voltage. If the circuits tests normal, replace the K20 ECM. If voltage is less than the specified range, test the motor control 1 circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  4. Connect a test lamp between the TAC motor control 2 circuit terminal A and B+. The test lamp should NOT illuminate. If the test lamp illuminates, test the control circuit 2 for a short to ground. If the circuit tests normal, replace the K20 ECM.
  5. Test for greater than 3.5 V between TAC motor control 1 circuit terminal B and TAC motor control 2 circuit terminal A. If the voltage is less than the specified value, test the motor control 2 circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  6. Ignition OFF, connect the J 34730-405: injector test lamp between the TAC motor control 1 and TAC motor control 2 circuits of the Q38 throttle body harness connector. Observe the injector test lamp while turning the ignition ON for 5 s and then OFF. Verify the injector test lamp illuminates brightly and then turns OFF. If the injector test lamp does not illuminate, replace the K20 ECM.
  7. If all circuits test normal, replace the Q38 throttle body.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Throttle Body Assembly Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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, P0641, P06A6P018CP018D, P0641, P06A6P06A6
SignalP018CP018B, P018CP018DP018B
Low ReferenceP0641, P06A6P06A6

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.

The ignition is ON.

The fuel pump control module detects that the fuel pressure 5 V reference is above or below a predetermined voltage threshold.

DTCs P0641 and P06A6 are Type A DTCs.

DTCs P0641 and P06A6 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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 harness connector of the B47 fuel pressure sensor.
  2. Ignition OFF, test for less than 1.0 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 control module.
  3. 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 the circuit tests normal, replace the K27 fuel pump 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 control module.
  4. If all circuits test normal, replace the B47 fuel pressure sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Fuel Pressure Sensor Replacement - Fuel Feed Pipe»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for fuel pump control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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) has 3 internal 5 V reference circuits. Each internal reference circuit provides a 5 V reference for more than one sensor. A short to ground or short to voltage on one of the external 5 V reference circuits can affect all the components connected to the same internal 5 V reference circuit.

  1. The ignition is ON for greater than 3 s.
  2. DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 run continuously when the above condition is met.

The 5 V reference circuit voltage is greater or less than a predetermined threshold.

DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.

DTCs P0641, P0642, P0643, P0651, P0652, P0653, P0697, P0698, and P0699 are Type A DTCs.

DTC P0641, P0642, and P0643

The 5 V reference 1 circuit provides 5 V to the following sensors

  1. Fuel tank pressure (FTP) sensor
  2. Engine oil pressure (EOP) sensor
  3. Fuel rail pressure (FRP) sensor
  4. Clutch pedal position sensor, if equipped

DTC P0651, P0652, and P0653

The 5 V reference 2 circuit provides 5 V to the following sensors

  1. All four camshaft position (CMP) sensors
  2. Accelerator pedal position (APP) sensor 1

DTC P0697, P0698, and P0699

The 5 V reference 3 circuit provides 5 V to the following sensors

  1. Throttle position sensor (TP) 1 and 2
  2. Crankshaft position (CKP) sensor
  3. Accelerator pedal position (APP) sensor 2
  4. A/C refrigerant pressure sensor

It may be possible to locate the fault by disconnecting one component at a time from the affected 5 V reference bus while viewing the 5 V Reference Circuit Status parameter on the scan tool. The scan tool parameter will change from Malfunction to OK when the source of the fault is disconnected. If all 5 V reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring harness.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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, P0642, P0643, P0651, P0652, P0653, P0697, P0698, or P0699 should not set.
  2. Observe the appropriate scan tool 5 V Reference Circuit Test Status parameter. The parameter should display 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 of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
  2. Ignition ON, test for 4.8-5.2 V between one of the affected 5 V reference circuits and ground. If the voltage is less than the specified range, test for a short to ground on the 5 V reference circuit for each affected component. If all circuits test normal, replace the K20 ECM. If the voltage is greater than the specified range, test for a short to voltage on the 5 V reference circuit for each affected component. If all circuits test normal, replace the K20 ECM.
  3. Connect each component associated with the affected 5 V reference circuit one at a time while monitoring the appropriate scan tool 5 V Reference Circuit Status parameter. The parameter should continue to display OK. If the parameter displays Malfunction when a component is connected, test the signal circuit of that component for a short to voltage. If the circuit tests normal, replace the component.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Accelerator Pedal Position Sensor Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LLT)»(/chevrolet/camaro/v-2009-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LS3, L99)»(/chevrolet/camaro/v-2009-2013/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning)
  3. «Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  4. «Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  5. «Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  6. «Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  7. «Clutch Pedal Position Sensor Replacement»(/chevrolet/camaro/v-2009-2013/remont/clutches-manual-hydraulic/#manual-transmission-clutch-system)
  8. «Crankshaft Position Sensor Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  9. «Engine Oil Pressure Sensor and/or Switch Replacement (LCS)»(/chevrolet/camaro/v-2009-2013/remont/mechanical/#engine-mechanical-36l-repair-instructions-on-vehicle-2-of-2)
  10. «Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  11. «Fuel Tank Pressure Sensor Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  12. «Throttle Body Assembly Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  13. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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
MIL Voltage SupplyP0650P0650
MIL ControlP0650*P0650P0650
* The MIL remains ON

The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC). The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service. The engine control module (ECM) monitors the MIL control circuit for conditions that are incorrect for the commanded state of the MIL. For example, a failure condition exists if the ECM detects low voltage when the MIL is commanded OFF, or high voltage when the MIL is commanded ON.

  1. The engine speed is greater than 80 RPM.
  2. The ignition voltage is between 10-18 volts.
  3. The ECM has commanded the MIL ON and OFF at least once during the ignition cycle.
  4. DTC P0650 runs continuously once the above conditions are met.

The ECM detects an open, a short to ground, or a short to voltage on the circuit that controls the MIL.

DTC P0650 is a Type B DTC.

DTC P0650 is a Type B DTC.

If the condition is intermittent, move the related harnesses and connectors with the engine operating. Monitor the scan tool Circuit Test Status parameters for the component. The Circuit Test 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

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 MIL ON and OFF with a scan tool. The MIL should turn ON and OFF as commanded.
  2. Ignition ON, command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters: MIL Control Circuit Low Voltage Test Status MIL Control Circuit Open Test Status MIL Control Circuit High 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. If any other IPC indicators or gauges are inoperative, refer to «Instrument Cluster Gauges Inoperative»(/chevrolet/camaro/v-2009-2013/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges) .
  2. Ignition OFF, disconnect the ECM harness connectors. Ignition ON, the MIL should not illuminate. If the MIL is illuminated, test the MIL control circuit terminal 21-X2 for a short to ground. If the circuit tests normal, replace the IPC.
  3. Ignition ON, connect a 3 A fused jumper wire between the MIL control circuit terminal 21-X2 and ground. The MIL should illuminate. If the MIL does not illuminate, test the MIL control circuit for a short to voltage, or an open/high resistance. If the circuit test normal, replace the IPC/bulb.
  4. If all circuits/connections test normal, replace the ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Instrument Cluster Replacement»(/chevrolet/camaro/v-2009-2013/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
  2. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 Voltage
B+ Supply Voltage - CoilP0685P0685
B+ Supply Voltage - SwitchP0689
Relay Control CircuitP0686P0685P0687
Ignition Voltage CircuitP0689P0690

The engine controls (EC) ignition relay, or powertrain relay is a normally open relay. The relay switch is held in the open position by spring tension. Battery positive voltage is supplied directly to the relay coil and the switch contact at all times. The engine control module (ECM) supplies the ground path to the relay coil control circuit via an internal integrated circuit called an output driver. When the ECM commands the powertrain relay ON, ignition voltage is supplied to several fuses in the underhood fuse block.

The ignition voltage that is supplied to the ECM, by the powertrain relay, provides power to the internal ECM circuits associated with the throttle actuator control (TAC) operation. The ECM also monitors the voltage level on the ignition voltage circuit to confirm that the powertrain relay contacts have closed.

P0685, P0686, and P0687

  1. The ignition voltage is between 10-18 V.
  2. The engine speed is greater than 80 RPM.
  3. The powertrain relay has been commanded ON and OFF.
  4. The DTCs run continuously when the above conditions are met.

P0689 and P0690

  1. The ignition voltage is between 10-18 V.
  2. The ignition is ON.
  3. The DTCs runs continuously when the above conditions are met.

P0685, P0686, and P0687

The commanded state of the driver and the actual state of the control circuit do not match for greater than 4 s or for a cumulative of 30 s.

P0689 and P0690

The ECM detects that powertrain relay feedback voltage is less than 6 V for greater than 1 s, when the powertrain relay is commanded ON or OFF. The condition exists for 4 s, or for a cumulative of 30 s.

DTCs P0685, P0686, P0687, P0689, and P0690 are Type C DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0685, P0686, P0687, P0689, and P0690 are Type C DTCs.

  1. This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to «Battery Inspection/Test»(/chevrolet/camaro/v-2009-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
  2. An open in the relay control circuit will cause no communication with the ECM when the ignition switch is cycled OFF and then ON after the initial failure. The malfunction indicator lamp (MIL) will flash rapidly and other relays can be heard turning on and off with the ignition ON.
  3. When disconnecting electrical connectors or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the mating electrical terminals for tightness.
  4. Use the J 35616 Connector Test Adapter Kit for any test that requires probing the underhood fuse block terminals, component wire harness terminals, or the ECM wire harness connector terminals.

Schematic Reference

  1. «Engine Controls Schematics»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-wiring-schematic-diagrams)
  2. «Power Distribution Schematics»(/chevrolet/camaro/v-2009-2013/remont/body-electrical/#wiring-systems-and-power-management-wiring-schematics-and-wiring-harness-routing-diagrams)

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Electrical Center Identification Views»(/chevrolet/camaro/v-2009-2013/remont/electrical-component-locations/#wiring-systems-and-power-management-component-locator-electrical-center-identification-views)
  4. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  5. «Wiring Repairs»(/chevrolet/camaro/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 35616 Connector Test Adapter Kit

  1. Engine running, command the Engine Controls (EC) Ignition Relay ON and OFF with a scan tool while observing the following EC Ignition Relay control circuit status parameters: Engine Controls Ignition Relay Control Circuit Low Voltage Test Status Engine Controls Ignition Relay Control Circuit Open Test Status Engine Controls Ignition Relay Control Circuit High Voltage Test Status Each parameter should display OK or Not Run in each commanded state.
  2. Ignition ON, you should be able to communicate with the ECM using a scan tool.
  3. Ignition ON, view the DTC information with a scan tool. DTC P0685, P0686, P0687, P0689, or P0690 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.

Note. You must perform the Circuit/System Verification first.

  1. Ignition OFF, disconnect the KR75 powertrain relay.
  2. Verify a test lamp illuminates between both of the following relay battery voltage circuit terminals and ground. Terminal 85 Terminal 30 If the test lamp does not illuminate, test the relay battery voltage circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground. If the test lamp illuminates, test the ignition voltage circuit for a short to voltage.
  4. Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 30 and the relay switch ignition voltage circuit terminal 87.
  5. Ignition ON, observe the scan tool EC Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should display B+. If not the specified value, or the ECM does not communicate, test the ignition voltage circuit between the powertrain relay and the ECM for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.
  6. Ignition OFF, verify that a test lamp does not illuminate between the control circuit terminal 86 and B+. If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
  7. Connect a DMM set to the diode setting between the control circuit terminal 86 and ground.
  8. Ignition ON, verify the DMM does not display OL. If the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  9. If all circuits test normal, replace the KR75 powertrain relay.

Component Testing

  1. Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay: 70-110 ohms 200-250 ohms If not within the specified range, replace the KR75 powertrain relay.
  2. Measure for infinite resistance between the following terminals of the KR75 powertrain relay: 30 and 86 30 and 87 30 and 85 85 and 87 If continuity is detected, replace the KR75 powertrain relay.
  3. Connect a 20 A fused jumper wire from the positive terminal of the battery to relay terminal 85. Connect a jumper wire from the negative terminal of the battery to relay terminal 86. Measure for less than 2 ohms between terminals 30 and 87 of the relay. If greater than the specified value, replace the KR75 powertrain relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Relay Replacement (Attached to Wire Harness)»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions) or «Relay Replacement (Within an Electrical Center)»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
  2. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 pump control module uses the serial data network to signal the engine control module (ECM) that the fuel pump control module is requesting malfunction indicator lamp (MIL) illumination. A DTC is set in the fuel pump control module, and the request for MIL illumination is sent when the fuel pump control module determines that a failure that affects emissions has occurred in the fuel pump control system. When the ECM receives the message from the fuel pump control module, DTC P069E will set in the ECM.

The ignition is ON, or the engine is running.

The fuel pump control module requests the ECM to illuminate the MIL.

  1. DTC P069E is a Type A DTC.
  2. DTC P069E will continue to be current or active as long as the fuel pump control module is requesting MIL illumination.

DTC P069E is a Type A DTC.

Communication codes, U-codes, as well as powertrain codes, P-codes, set in the fuel pump control module will cause the fuel pump control module to request DTC P069E to be set in the ECM.

DTC Type Reference

Scan Tool Reference

  1. DTC P069E is an informational DTC. If there are no engine controls or communication DTCs, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for diagnosis of fuel pump control module DTCs.
  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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each of the diagnostic category.

The diagnostic trouble code (DTC) indicates that an emission related transmission DTC set in the transmission control module (TCM). The engine control module (ECM) receives the TCM information over the serial data circuit. The ECM turns ON the malfunction indicator lamp (MIL) when the TCM sends a message over the serial data circuit requesting MIL illumination. The DTC information for the ECM will only display DTC P0700, but the Freeze Frame/Failure Records data will display the transmission DTC that set.

  1. The ignition is ON or the engine is operating.
  2. DTC P0700 runs continuously.

The ECM receives a serial data message from the TCM requesting the ECM to turn ON the MIL lamp.

DTC P0700 is a Type A DTC.

DTC P0700 is a Type A DTC.

Communication codes, U-codes, as well as powertrain codes, P-codes, set in the TCM can cause the TCM to request DTC P0700 to be set in the ECM.

DTC Type Reference

Scan Tool Reference

  1. DTC P0700 is an informational DTC. If there are no engine controls or communication DTCs, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for diagnosis of TCM DTCs.
  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. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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) 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 engine is running.

The fuel pump control module detects an over-temperature fault.

DTCs P064A and P1255 are Type A DTCs.

DTCs P064A and P1255 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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 P0231, P0232 or P023F are not set. If any of those codes are set, refer to «DTC P0231, P0232, or P023F»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0192-through-p0606p062f) .
  2. Ensure that the entire undercarriage of the vehicle is clean, especially around the area where the K27 fuel pump control module is located. Clear all codes from the K27 fuel pump control module and test drive the vehicle. Verify that DTC P1255 or P064A do not set. If DTC P1255 or P064A reset, replace the K27 fuel pump control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Correct engine misfire detection is dependent on whether or not the vehicle is experiencing a rough road condition. A rough road condition causes unexpected crankshaft fluctuations. In order to detect a rough road condition, the electronic brake control module (EBCM) communicates a wheel speed signal over the serial data circuit to the engine control module (ECM). The wheel speed sensor information allows the ECM to distinguish if the crankshaft speed variations are caused by a rough road condition or are caused by a true misfire.

  1. The engine is operating.
  2. DTC P1380 runs continuously once the above condition is met for greater than 5 seconds.
  1. The ECM detects an engine misfire while the rough road signal is unavailable.
  2. The condition exists for greater than 4 seconds or a cumulative of 30 seconds.

DTC P1380 is a Type C DTCs.

DTC P1380 is a Type C DTCs.

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Start and idle the engine, observe the DTC information with a scan tool. DTC P1380 should not set. NOTE: If any UXXXX DTCs are set, diagnose those first. If DTC P1380 failed this ignition, refer to «Symptoms - Antilock Brake System»(/chevrolet/camaro/v-2009-2013/remont/anti-locktraction-control/#antilock-brake-system) .
  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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position sensors 1 and 2 to determine the actual throttle valve position.

  1. The vehicle speed is 0 km/h (0 mph).
  2. The engine speed is 0 RPM.
  3. The engine coolant temperature (ECT) is between 5-100°C (41-212°F).
  4. The intake air temperature (IAT) is between 5-144°C (41-291°F).
  5. The ignition voltage is greater than 10 volts.
  6. The accelerator pedal position (APP) is less than 15 percent.
  7. DTC P1551 runs when the conditions above have been met for greater than 5 seconds.
  1. The ECM detects the TP sensor angle is less than 10 percent or greater than 40 percent when the throttle actuator control motor is deactivated.
  2. The condition exists, then a 5 second delay for MIL On.

DTC P1551 is a type A DTC.

DTC P1551 is a type A DTC.

  1. The scan tool has the ability to operate the throttle actuator control system using Special Functions. This function operates the throttle through the entire range in order to determine if the throttle body and system operate correctly.
  2. Inspect for a condition in which the throttle valve may have been held open.
  3. Inspect for conditions in which ice may have formed in the throttle bore.
  4. The throttle valve is spring loaded to a slightly open position. This is referred to as the rest position. The throttle valve should not be completely closed, nor should it be open any greater than predetermined amount. The throttle valve should move open and to the closed position without binding under the normal spring pressure. The throttle should NOT be free to move open or closed WITHOUT spring pressure.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 DTC P0121, P0122, P0123, P0221, P0222, P0223, P2100, P2101, or P2119 is not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Start the engine. Observe the DTC information with a scan tool for 30 seconds. DTC P1551 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.

Ignition OFF, disconnect the air intake duct at the Q38 throttle body and inspect for the following

  1. Throttle valve that is NOT in the rest position
  2. Throttle valve that is binding open or closed
  3. Throttle valve that is free to move open or closed WITHOUT spring pressure
  1. If a condition is found, replace the Q38 throttle body assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 Description

Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. This allows optimal catalyst efficiency under light load conditions at a steady cruise. The engine control module (ECM) constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.

  1. Before the ECM can report DTC P2096 or P2098 failed, DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, P0058, P013A, P013C, P013E, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P014A, P0140, P0141, P0150, P0151, P0152, P0153, P0155, P0157, P0158, P0160, P0161, P2232, P2235, P2270, P2271, P2272, and P2273 must run and pass.
  2. DTC P0100, P0101, P0102, P0103, P0420, P0430, P0442, P0443, P0455, P0458, P0459, P2177, P2178, P2179, P2180, P2187, P2188, P2189 or P2190 is not set.
  3. The engine speed is 1,280-3,480 RPM.
  4. The engine load is 17-65 percent and steady.
  5. The closed loop fuel control is active for greater than 1 second.
  6. The calculated exhaust gas temperature is greater than 250°C (482°F).
  7. DTC P2096 and P2098 run continuously when the conditions above have been met for greater than 130 seconds.

The lean correction limit for a condition causing a rich air/fuel ratio has been exceeded for greater than 4 seconds or for a cumulative of 30 seconds.

DTCs P2096 and P2098 are Type B DTCs.

DTCs P2096 and P2098 are Type B DTCs.

An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 there is no other HO2S or fuel trim DTC set. If any other HO2S or fuel trim DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Verify that none of the following conditions exist: Rich fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . High fuel system pressure-Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) or «Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Fuel saturation of the evaporative emissions (EVAP) canister Stuck open or leaking EVAP purge valve Restricted exhaust Incorrect PCV system operation If you find any of the above conditions, repair as necessary.
  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 diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. This allows optimal catalyst efficiency under light load conditions at a steady cruise. The engine control module (ECM) constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount.

  1. Before the ECM can report DTC P2097 or P2099 failed, DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, P0058, P013A, P013C, P013E, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P014A, P0140, P0141, P0150, P0151, P0152, P0153, P0155, P0157, P0158, P0160, P0161, P2232, P2235, P2270, P2271, P2272, and P2273 must run and pass.
  2. DTC P0100, P0101, P0102, P0103, P0420, P0430, P0442, P0443, P0455, P0458, P0459, P2177, P2178, P2179, P2180, P2187, P2188, P2189 or P2190 is not set.
  3. The engine speed is 1,280-3,480 RPM.
  4. The engine load is 17-65 percent and steady.
  5. The closed loop fuel control is active for greater than 1 second.
  6. The calculated exhaust gas temperature is greater than 250°C (482°F).
  7. DTC P2097 and P2099 run continuously when the conditions above have been met for greater than 130 seconds.

The rich correction limit for a condition causing a lean air/fuel ratio has been exceeded for greater than 4 seconds or for a cumulative of 30 seconds.

DTCs P2097 and P2099 are Type B DTCs.

DTCs P2097 and P2099 are Type B DTCs.

  1. An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
  2. An exhaust system leak that may not be audible can set this DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 there is no other HO2S or fuel trim DTC set. If any other HO2S or fuel trim DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Verify that none of the following conditions exist: Exhaust system leaks-Refer to «Exhaust Leakage»(/chevrolet/camaro/v-2009-2013/remont/exhaust/#engine-exhaust-system__exhaust-leakage) Engine vacuum leaks Low fuel system pressure-Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) or «Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Lean fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . If you find any of the above conditions, repair as necessary.
  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 diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position.

  1. The ECM power down process in the last drive cycle was completely finished.
  2. DTC P2105 runs continuously once the above condition is met for greater than 5 seconds.
  1. The ECM detects an incorrect voltage level at the ignition voltage supply circuits. OR
  2. The ECM detects an internal communication error.
  3. Either condition exists, then a 5 second delay for MIL ON.

DTC P2105 is a Type A DTC.

DTC P2105 is a Type A DTC.

  1. If DTC P2105 sets, the engine will stall and not restart until the ignition is cycled OFF and then ON.
  2. Additional DTCs set when P2105 sets.
  3. The ignition key will not be able to be removed from the ignition switch until another ignition cycle occurs.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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. Start the engine. Rapidly move the accelerator pedal from the rest position, to wide open throttle position, back to the rest position. Repeat the procedure a few times. DTC P2105 should not set.
  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, remove the fuse that supplies voltage to terminal 5 X2 of the K20 ECM. Verify the fuse is OK. NOTE: This DTC will only set if the fuse is open and the circuits are not grounded. The ignition voltage circuits must be tested thoroughly for an intermittent short to ground. If the fuse is open, test the ignition voltage circuit between the open fuse and the K20 ECM terminal 5 X2 for an intermittent short to ground.
  2. Install the fuse.
  3. Disconnect the harness connectors of the K20 ECM.
  4. Ignition ON, load test for B+ on the ignition circuit terminal 5 X2 of the K20 ECM connector. If less than B+, repair the ignition circuit for an open/high resistance.
  5. If all circuits/connections test OK, replace the K20 ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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
Accelerator Pedal Position (APP) Sensor 1 5-Volt Reference CircuitP0343, P0348, P0368, P0393, P0652, P2122P2122, P2138P0651, P2122P0653, P2138, P2123P0651, P0652, P0653, P2138
Accelerator Pedal Position (APP) Sensor 2 5-Volt Reference CircuitP0122, P0222, P0335, P0642, P0698, P0700P2127, P2138P0697, P2127P0123, P0221, P0699, P2138, P2128, P0700P0697, P0698, P0699, P2138
Accelerator Pedal Position (APP) Sensor 1 SignalP2122P2138P2122P2123P2138
Accelerator Pedal Position (APP) Sensor 2 SignalP2127P2138P2127P2128P2138
Accelerator Pedal Position (APP) Sensor 1 Low ReferenceP2123, P2138P2123P2138
Accelerator Pedal Position (APP) Sensor 2 Low ReferenceP2127, P2138P2128P2138

Typical Scan Tool Data

CircuitShort to GroundOpenShort to Voltage
Operating Conditions: The engine is operating at idle. Parameter Normal Range: APP Sensor 1 0%/1 Volts Parameter Normal Range: APP Sensor 2 0%/0.5 Volts
5-Volt Reference0%/0.00 Volts0%/0.00 Volts0%/4.98 Volts
APP Sensor 1 Signal0%/0.00 Volts0%/0.00 Volts0%/4.98 Volts
APP Sensor 2 Signal0%/0.00 Volts0%/0.00 Volts0%/4.98 Volts
APP Sensor 1 Low Reference0%/4.98 Volts
APP Sensor 2 Low Reference0%/4.98 Volts

APP Sensor

The accelerator pedal assembly contains two accelerator pedal position (APP) sensors. The APP sensors are mounted in the pedal assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to the position of the accelerator pedal. The engine control module (ECM) supplies a separate 5-volt reference and low reference circuit for each of the APP sensors.

The APP sensor 1 signal voltage increases as the pedal is depressed, from approximately 1.0 volt at rest to approximately 4 volts when fully depressed. The APP sensor 2 signal voltage increases as the pedal is depressed, from approximately 0.5 volt at rest to approximately 2 volts with the accelerator pedal fully depressed.

  1. The ignition is ON or the engine is operating.
  2. The ignition voltage is greater than 7 volts.
  3. The DTCs run continuously once the above conditions are met for greater than 200 ms.

P2122

The APP sensor 1 voltage is less than 0.74 volt, then a 5 second delay for MIL ON.

P2123

The APP sensor 1 voltage is greater than 4.82 volts, then a 5 second delay for MIL ON.

P2127

The APP sensor 2 voltage is less than 0.63 volt, then a 5 second delay for MIL ON.

P2128

The APP sensor 2 voltage is greater than 4.82 volts, then a 5 second delay for MIL ON.

P2138

  1. The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.25 volts, with a released pedal.
  2. The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 0.31 volts with a partially pressed pedal.
  3. The ECM detects that the voltage difference between APP sensor 1 and 2 is greater than 1.70 volts with a fully pressed pedal.
  4. DTC P2138 sets if any of the above conditions exist, then a 5 second delay for MIL ON.

DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.

DTCs P2122, P2123, P2127, P2128, and P2138 are Type A DTCs.

Test the current output of the 5-volt reference circuits if you suspect high resistance in the circuit. The current output should be greater than 80 mA for APP 1 and greater than 50 mA for APP 2.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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, P0652, P0653, P0697, P0698, or P0699 should not be set. If a DTC is set, refer to «DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0627-through-p2544) .
  2. Observe the scan tool APP Sensor voltage parameters. Verify both of the APP sensor voltages are between 0.4-4.5 V.
  3. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times. DTCs P2122, P2123, P2127, P2128, or P2138 should not set.
  4. Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. DTCs P2122, P2123, P2127, P2128, or P2138 should not set.
  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, remove the fuse that supplies B+ to terminal 56 X2 of the ECM.
  2. Disconnect the harness connector at the B107 accelerator pedal assembly.
  3. Test for less than 5 ohms between the appropriate low reference circuit listed below and ground. B107 APP sensor 1 terminal D B107 APP sensor 2 terminal A If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.
  4. Install the fuse that supplies B+ to terminal 56 X2 of the ECM.
  5. Ignition ON, test for 4.8-5.2 V between the appropriate 5-volt reference circuit listed below and ground. B107 APP sensor 1 terminal F B107 APP sensor 2 terminal C If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the K20 ECM. If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
  6. Observe the scan tool APP sensor 1 voltage parameter. Verify the voltage is less than 0.3 V. If greater than the specified range, test the signal circuit terminal E for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
  7. Observe the scan tool APP sensor 2 voltage parameter. Verify the voltage is less than 0.3 V. If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
  8. Connect a 3 A fused jumper wire between the APP sensor 1 signal circuit terminal E and the 5-volt reference circuit terminal F. Verify the APP sensor 1 voltage parameter 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/connections test normal, replace the K20 ECM.
  9. Connect a 3 A fused jumper wire between the APP sensor 2 signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the APP sensor 2 voltage parameter 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/connections test normal, replace the K20 ECM.
  10. If all circuits/connections test normal, test or replace the B107 accelerator pedal assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Accelerator Pedal Position Sensor Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 throttle valve by applying a varying voltage to the throttle actuator control (TAC) motor. The ECM monitors the actual throttle valve position using throttle position (TP) sensor 1 and 2.

  1. The engine speed is less than 40 RPM.
  2. The vehicle speed is 0 km/h (0 mph).
  3. The engine coolant temperature (ECT) is between 5-101°C (41-214°F).
  4. The intake air temperature (IAT) is between 5-144°C (41-291°F).
  5. The accelerator pedal position (APP) sensor angle is less than 15 percent.
  6. The ignition voltage is greater than 10 volts.
  7. DTC P2176 runs once per ignition cycle, when the ignition is ON and the above conditions are met for greater than 1 second.
  1. The ECM detects that the TP sensor 1 voltage is not between 4.12-4.55 V after the throttle learn procedure, with the throttle at rest.
  2. The ECM detects that the TP sensor 2 voltage is not between 0.34-0.99 V after the throttle learn procedure, with the throttle at rest.
  3. The minimum throttle position is not learned after an ECM replacement.
  4. Either condition exists for greater than 1 second, or a cumulative 10 seconds.

DTC P2176 is a Type A DTC.

DTC P2176 is a Type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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, rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release the pedal. Repeat the procedure several times. Observe the DTC information with a scan tool. Verify that DTC P0121, P0122, P0123, P0221, P0222, P0223, P0638, or P2101 do not set. If a DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) «DTC P0121-P0123 or P0221-P0223»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) for further diagnosis.
  2. DTC P2176 is an informational DTC. Perform the throttle learn procedure, refer to «Throttle/Idle Learn (Without LF1, LFW)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions) . If DTC P2176 resets after performing the throttle learn procedure, replace the Q38 throttle body.
  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 diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 trim control system monitors the range of the air/fuel ratio in order to maintain the desired ratio for optimum emissions performance. The system performs tests during certain operating conditions to detect unmetered air or unmetered fuel. The fuel trim control system operation can be observed by monitoring the scan tool Short Term and Long Term Fuel Trim parameters.

P2177 or P2179

  1. Before the ECM can report DTC P2177 or P2179, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.
  2. The engine speed is between 1,200-3,400 RPM.
  3. The engine load is between 13-50 %.
  4. The throttle angle is less than 100 %.
  5. The cold start fuel control is not active.
  6. The Closed Loop fuel control is enabled.
  7. The engine is not in decel fuel cut-off.
  8. The engine coolant temperature is warmer than 60°C (140°F).
  9. The intake air temperature (IAT) is colder than 60°C (140°F).
  10. DTC P2177 and P2179 run continuously once the above conditions are met for approximately 300 s, after Closed Loop fuel control is enabled.

P2187 or P2189

  1. Before the ECM can report DTC P2187 or P2189, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.
  2. The engine speed is between 520-1,000 RPM.
  3. The engine load is between 0-23 %.
  4. The throttle angle is less than 100 %.
  5. The cold start fuel control is not active.
  6. The Closed Loop fuel control is enabled.
  7. The engine is not in decel fuel cut-off.
  8. The engine coolant temperature (ECT) is warmer than 60°C (140°F).
  9. The intake air temperature (IAT) is colder than 60°C (140°F).
  10. DTC P2187 and P2189 run continuously once the above conditions are met for approximately 600 s, after Closed Loop fuel control is enabled.

P2177 or P2179

The Long Term Fuel Trim Cruise/Accel is greater than 32 % for 4 s or for a cumulative time of 30 s.

P2187 or P2189

The Long Term Fuel Trim Idle/Decel is greater than 6 % for 4 s or for a cumulative of 30 s.

DTCs P2177, P2179, P2187 and P2189 are Type B DTCs.

DTCs P2177, P2179, P2187 and P2189 are Type B DTCs.

  1. An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
  2. Observing the LT FT Bn 1 and Bn 2 parameters, while driving the vehicle can determine whether the lean condition is effecting only one bank, or is common to both banks of the engine.
  3. A fuel system delivery condition causes this DTC to set. Thoroughly inspect all items that cause a lean condition. Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) .
  4. Any un-metered air into the engine causes this DTC to set. Thoroughly inspect all areas of the engine for vacuum leaks.
  5. A MAF sensor condition can cause this DTC without setting a MAF DTC. If there is a MAF sensor condition, the MAF sensor parameters will appear to be within range.
  6. Inspect the air filter for being the correct one for this application. Make sure that the engine oil fill cap is in place and that it is tight. Verify that the engine oil dip stick is fully seated.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 P2177, P2179, P2187, or P2189 should not be set. If any other DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to diagnosis the applicable DTC.
  2. Ignition ON, observe the barometric pressure (BARO) sensor pressure parameter and compare the reading on the scan tool to the barometric pressure table. Refer to «Altitude Versus Barometric Pressure»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-specifications__altitude-versus-barometric-pressure) . If the BARO sensor pressure is not within the range specified for your altitude, refer to «DTC P2227, P2228, or P2229 (LLT, LY7)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0627-through-p2544) .
  3. Engine at normal operating temperature, observe the scan tool Long Term Fuel Trim parameters. The LT FT Cruise/Accel parameters should be less than 33 %. The LT FT Idle/Decel parameters should be less than 7 %. If not within the specified range, verify none of the following conditions exist: The heated oxygen sensor (HO2S) is installed securely and the electrical connector is not contacting the exhaust system. Missing, restricted, or leaking exhaust components-Refer to «Symptoms - Engine Exhaust»(/chevrolet/camaro/v-2009-2013/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . The air intake system after the MAF sensor for vacuum leaks A mass air flow (MAF) sensor signal that is skewed-If the Short Term FT parameters for both banks changes greater than 20 % when the MAF sensor is disconnected, refer to «DTC P0101»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) . Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) or «Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) and «Fuel System Cleaning»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions__fuel-system-cleaning) . Splits, kinks, or improper connections at the vacuum hoses The fuel system is operating lean. Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Vacuum leaks at the intake manifold or throttle body Leaking crankcase ventilation system The engine control module grounds for being clean, tight, and in the correct locations A high engine oil level condition-A high engine oil level causes oil residue to form on the mass air flow (MAF) sensor, causing a lean indication. The MAF sensor does not need to be replaced. Vacuum leaks that only affect one bank of the engine-For example, the intake manifold, the injector O-rings. Lean injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/chevrolet/camaro/v-2009-2013/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) .
  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 diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 trim control system monitors the range of the air/fuel ratio in order to maintain the desired ratio for optimum emissions performance. The system performs tests during certain operating conditions to detect unmetered air or unmetered fuel. The fuel trim control system operation can be observed by monitoring the scan tool Short Term and Long Term Fuel Trim parameters.

P2178 or P2180

  1. Before the ECM can report DTC P2178 or P2180, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0201, P0202, P0203, P0204, P0205, P0206, P0221, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.
  2. The engine speed is between 1,200-3,400 RPM.
  3. The engine load is between 13-50 %.
  4. The throttle angle is less than 100 %.
  5. The cold start fuel control is not active.
  6. The Closed Loop fuel control is enabled.
  7. The engine is not in decel fuel cut-off.
  8. The engine coolant temperature is warmer than 60°C (140°F).
  9. The intake air temperature (IAT) is colder than 60°C (140°F).
  10. DTCs P2178 and P2180 run continuously when the above conditions are met for approximately 300 s, after Closed Loop fuel control is enabled.

P2188 or P2190

  1. Before the ECM can report DTC P2188 or P2190, failed, DTCs P000A, P000B, P000C, P000D, P0008, P0009, P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0461, P0462, P0463, P2068 P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095 P2146, P2149, P2152, P2155, P216A, and P216D must run and pass.
  2. The engine speed is between 520-1,000 RPM.
  3. The engine load is between 0-23 %.
  4. The throttle angle is less than 100 %.
  5. The cold start fuel control is not active.
  6. The Closed Loop fuel control is enabled.
  7. The engine is not in decel fuel cut-off.
  8. The engine coolant temperature (ECT) is warmer than 60°C (140°F).
  9. The intake air temperature (IAT) is colder than 60°C (140°F).
  10. DTCs P2188 and P2190 run continuously when the above conditions are met for approximately 600 s, after Closed Loop fuel control is enabled.

P2178 or P2180

The Long Term Fuel Trim Cruise/Accel is less than -22 % for 4 s or for a cumulative of 30 s.

P2188 or P2190

The Long Term Fuel Trim Idle/Decel is less than -6 % for 4 s or for a cumulative of 30 s.

DTCs P2178, P2180, P2188, and P2190 are Type B DTCs.

DTCs P2178, P2180, P2188, and P2190 are Type B DTCs.

  1. An HO2S will not cause this DTC to set without the occurrence of circuit related HO2S DTCs. Do not replace an HO2S to address this DTC.
  2. Observing the LT FT Bn 1 and Bn 2 parameters, while driving the vehicle can determine whether the rich condition is effecting only one bank, or is common to both banks of the engine.
  3. A fuel system delivery condition causes this DTC to set. Thoroughly inspect all items that cause a rich condition. Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) .
  4. Review the Freeze Frame/Failure Records with a scan tool.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 P2178, P2180, P2188, or P2190 should not be set. If any other DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to diagnosis the applicable DTC.
  2. Ignition ON, observe the barometric pressure (BARO) sensor pressure parameter and compare the reading on the scan tool to the barometric pressure table. Refer to «Altitude Versus Barometric Pressure»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-specifications__altitude-versus-barometric-pressure) . If the BARO sensor pressure is not within the range specified for your altitude, refer to «DTC P2227, P2228, or P2229 (LLT, LY7)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0627-through-p2544) .
  3. Engine at normal operating temperature, observe the scan tool Long Term Fuel Trim parameters. The LT FT Cruise/Accel parameters should be greater than -23 %. The LT FT Idle/Decel parameters should be greater than -7 %. If not within the specified range, inspect for the following conditions: A mass air flow (MAF) sensor signal that is skewed. If the Short Term FT parameters for both banks changes greater than 20 % when the MAF sensor is disconnected, refer to «DTC P0101»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-dtc-p0008-through-p0191) . A collapsed air intake duct A restricted air filter element-Refer to «Air Cleaner Element Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions) . The MAF sensor for foreign objects-Refer to «Mass Airflow Sensor with Intake Air Temperature Sensor Replacement»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions) . Excessive fuel in the crankcase-Change the oil as necessary. Fuel contamination-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) or «Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) and «Fuel System Cleaning»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions__fuel-system-cleaning) . The engine control module grounds for being clean, tight, and in the correct locations Rich injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Restricted exhaust system-Refer to «Symptoms - Engine Exhaust»(/chevrolet/camaro/v-2009-2013/remont/exhaust/#engine-exhaust-system__symptoms-engine-exhaust) . An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/chevrolet/camaro/v-2009-2013/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) .
  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 diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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 barometric pressure (BARO) sensor responds to changes in altitude and atmospheric conditions. This gives the engine control module (ECM) an indication of barometric pressure. The ECM uses this information to calculate fuel delivery. The BARO sensor is located within the controller and is not serviced as a separate unit. The BARO sensor provides a voltage signal to the ECM relative to the atmospheric pressure changes. The ECM monitors the BARO sensor signal for a voltage outside of the normal range.

P2227

  1. Before the ECM can report DTC P2227 failed, DTCs P0100, P0101, P0102, P0103, P0121, P0122, P0123, P0221, P0222, P0223, P2228, and P2229 must run and pass.
  2. The engine is operating for greater than 1 s.
  3. The mass air flow sensor signal is valid.
  4. The evaporative emission (EVAP) leak test is not enabled.
  5. DTC P2227 runs continuously once the above conditions are met for 2 s.

P2228 or P2229

  1. The engine is operating.
  2. The DTCs run continuously once the above conditions are met for 2 s.

P2227

  1. The ECM detects that the BARO pressure is less than 50 kPa or greater than 115 kPa and DTC P2228 or P2229 is not set.
  2. The ECM detects that the BARO pressure changed greater than 10 kPa within 20 s.
  3. The ECM detects that the BARO pressure changed greater than 30 kPa since the last ignition cycle, and the difference between the BARO signal and the calculated BARO is greater than 2 kPa. The condition exists within 1 s of engine start up.
  4. DTC P2227 sets if any of the conditions above exist for greater than 1 s.

P2228

The ECM detects that the BARO sensor voltage is less than 0.20 V for 1 s.

P2229

The ECM detects that the BARO sensor voltage is greater than 4.87 V for 1 s.

DTCs P2227, P2228, and P2229 are Type B DTCs.

DTCs P2227, P2228, and P2229 are Type B DTCs.

Schematic Reference

Connector End View Reference

DTC Type Reference

Scan Tool Reference

Control Module References for scan tool information

  1. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set.
  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. Inspect the atmospheric vent on the K20 ECM case for one of the following conditions: Moisture in the vent inlet Debris in the vent inlet If a condition exists, attempt to clean or dry the atmospheric inlet.
  2. Start the engine. Observe the DTC information with a scan tool. DTCs P2227, P2228, or P2229 should not set. If DTC P2227, P2228, or P2229 sets, replace the K20 ECM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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) supplies a voltage near 450 mV between the heated oxygen sensor (HO2S) signal circuit and the low reference circuit. The HO2S varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount of time that the HO2S voltage was out of range. Or, to detect if the HO2S signal voltage switches at the same rate at which the ECM is commanding the heater ON and OFF.

  1. The engine is operating.
  2. The ignition voltage is greater than 10 volts.
  3. The calculated exhaust gas temperature is colder than 800°C (1,472°F) for greater than 10 seconds.
  4. The HO2S 2 is warmed up for greater than 90 seconds.
  5. The HO2S 2 heater command is stable.
  6. DTC P2232 and P2235 run continuously once the conditions above exist for greater than 10 seconds.
  1. The ECM detects that the HO2S 2 signal voltage increases greater than 2 volts within 40 mS, in 4 out of 6 HO2S heater switch OFF samples.
  2. The condition exists for greater than 1 second, or for a cumulative of 10 seconds.

DTCs P2232 and P2235 are Type B DTCs.

DTCs P2232 and P2235 are Type B DTCs.

  1. The HO2S 2 voltage should be between 400-520 mV with the ignition ON. If the voltage is greater than the specified value, there is a condition with the HO2S circuits. If the voltage does not change after disconnecting the HO2S 2, the condition is between the sensor and the ECM. If the voltage is between 400-520 mV after disconnecting the sensor, the condition is with the HO2S 2.
  2. Inspect the HO2S harness connector for water intrusion. Moisture in a connector may cause voltage to bleed to other circuits within the connector.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 HO2S 2 voltage parameter. The HO2S voltage parameter should be less than 1,050 mV.
  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 appropriate B52 HO2S 2.
  2. Ignition ON, verify that the scan tool HO2S 2 parameter is between 400-520 mV. If greater than the specified range, test the signal circuit terminal B for a short to the heater control circuit terminal E. If the circuit/connections test normal, replace the K20 ECM.
  3. If all circuits/connections test normal, replace the appropriate B52 HO2S 2.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  3. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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) supplies a voltage near 450 mV between the heated oxygen sensor (HO2S) high signal circuit and the low reference circuit. The HO2S varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount of time that the HO2S voltage was out of range. The ECM compares the stored HO2S voltage samples taken within each sample period and determines if the majority of the samples are out of the operating range. The ECM test for the following conditions

  1. The ECM monitors the HO2S voltage to determine if the signal voltage goes above a predetermined threshold within a certain amount of time. If the ECM determines that the signal voltage remains below a threshold, the ECM will command the fuel system rich to determine if the HO2S signal voltage can be forced above the threshold within a certain amount of time.
  2. The ECM monitors the HO2S voltage during power enrichment to ensure that the signal voltage goes above a predetermined threshold during power enrichment.
  1. Before the ECM can report DTC P2270 or P2272 failed, DTCs P0036, P0037, P0038, P0056, P0057, P0058, P013A, P013C, P013E, P0137, P0138, P014A, P0140, P0141, P0157, P0158, P0160, P0161, P0443, P0458, P0459, P2096, P2098, P2177, P2179, P2187, and P2189 must run and pass.
  2. DTC P0461, P0462, P0463, P2066, P2067, or P2068 is not set.
  3. The engine is operating.
  4. The ignition voltage is greater than 10 V.
  5. The HO2S 2 is at operating temperature for greater than 10 s.
  6. The long term fuel control is enabled.
  7. The engine is not in decel fuel cut-off (DEFCO).
  8. The mass air flow (MAF) sensor is greater than 10 g/s.
  9. The MAF sensor is between 6-33 g/s for greater than 3 s during the intrusive test.
  10. DTC P2270 and P2272 run continuously once the above conditions are met for approximately 10 min, or 20 min if the fuel level is less 12 %.

The ECM detects that the HO2S 2 voltage is less than 629 mV for greater than 100 s, then an intrusive test is performed. The ECM will enrich the fuel mixture 2 % per second up to 20 % then hold the enrichment for 10 s. If the ECM detects that the HO2S 2 voltage is less than 629 mV during the intrusive test, for greater than 4 s or for a cumulative of 30 s, the DTC sets.

DTCs P2270 and P2272 are Type B DTCs.

DTCs P2270 and P2272 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 DTC P0137, P0138, P0140, P0157, P0158, or P0160 is not set. If any of the listed DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Operate the engine above 1,200 RPM for 30 s, observe the HO2S 2 voltage parameter. The reading should fluctuate greater and less than the range of 401-519 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. Engine operating, move the related HO2S harnesses for the appropriate HO2S 2 between the B52 HO2S harness connector and the K20 engine control module (ECM) while monitoring the appropriate scan tool HO2S 2 voltage parameter. Verify that the HO2S 2 parameter does not change abruptly while moving the related harnesses. If the HO2S parameter does change abruptly while moving the related harnesses repair the circuit as necessary.
  2. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S 2.
  3. Ignition ON, verify that the scan tool HO2S 2 parameter is between 400-520 mV. If less than the specified range, test the signal circuit terminal B or 4 for a short to ground. If the circuit/connections test normal, replace the K20 ECM.
  4. Verify that none of the following conditions exist: Lean fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Water intrusion in the HO2S harness connector Low fuel system pressure-Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) or «Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . The vacuum hoses for splits, kinks, and proper connection The air intake system after the mass air flow (MAF) sensor for vacuum leaks Exhaust system leaks Contaminated HO2S - Silicon An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/chevrolet/camaro/v-2009-2013/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) . If you find any of the above conditions, repair as necessary.
  5. If all circuits/connections test normal, replace the appropriate B52 HO2S 2.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  3. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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) supplies a voltage near 450 mV between the heated oxygen sensor (HO2S) high signal circuit and the low reference circuit. The HO2S varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount of time that the HO2S voltage was out of range. The ECM compares the stored HO2S voltage samples taken within each sample period and determines if the majority of the samples are out of the operating range. The ECM test for the following conditions

  1. The ECM monitors the HO2S voltage to determine if the signal voltage goes below a predetermined threshold within a certain amount of time. If the ECM determines that the signal voltage remains above the threshold, the ECM will command the fuel system lean to determine if the HO2S signal voltage can be forced below the threshold within a certain amount of time.
  2. The ECM monitors the HO2S voltage during fuel cut-off to determine if the signal voltage is greater than a predetermined threshold.
  1. Before the ECM can report DTC P2271 or P2273 failed, DTCs P0036, P0037, P0038, P0056, P0057, P0058, P013A, P013C, P013E, P0137, P0138, P014A, P0140, P0141, P0157, P0158, P0160, P0161, P0443, P0458, P0459, P2097, P2099, P2178, P2180, P2188, and P2190 must run and pass.
  2. DTC P0461, P0462, P0463, P2066, P2067, or P2068 is not set.
  3. The engine is operating.
  4. The ignition voltage is greater than 10 V.
  5. The HO2S 2 is at operating temperature for greater than 10 s.
  6. The long term fuel control is enabled.
  7. The engine is not in decel fuel cut-off (DEFCO).
  8. The mass air flow (MAF) sensor is greater than 10 g/s.
  9. The MAF sensor is between 6-33 g/s for greater than 3 s during the intrusive test.
  10. DTC P2271 and P2273 run continuously once the above conditions are met for approximately 10 min, or 20 min if the fuel level is less than 12 %.

The ECM detects that the HO2S 2 voltage is greater than 629 mV for greater than 100 s, then an intrusive test is performed. The ECM will lean the fuel mixture -2 % per second up to -15 % then hold the lean fuel mixture for 10 s. If the ECM detects that the HO2S voltage is greater than 629 mV during the intrusive test, for greater than 4 s or for a cumulative of 30 s, the DTC sets.

DTCs P2271 and P2273 are Type B DTCs.

DTCs P2271 and P2273 are Type B DTCs.

Schematic Reference

Connector End View Reference

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 DTC P0137, P0138, P0140, P0157, P0158, or P0160 is not set. If any of the listed DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) for further diagnosis.
  2. Operate the engine above 1,200 RPM for 30 s, observe the HO2S 2 voltage parameter. The parameter should fluctuate greater and less than the range of 401-519 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. Engine operating, move the related HO2S harness for the appropriate HO2S 2 between the B52 HO2S harness connector and the K20 engine control module (ECM) while monitoring the appropriate scan tool HO2S 2 voltage parameter. Verify that the HO2S 2 parameter does not change abruptly while moving the related harnesses. If the HO2S parameter does change abruptly while moving the related harnesses repair the circuit as necessary.
  2. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S 2.
  3. Ignition ON, verify that the HO2S parameter is between 400-520 mV. If greater than the specified range, test the signal circuit terminal B or 4 for a short to voltage. If the circuit/connections test normal, replace the K20 ECM.
  4. Verify that none of the following conditions exist: Rich fuel injectors-Refer to «Fuel Injector Solenoid Coil Test»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Water intrusion in the HO2S harness connector High fuel system pressure-Refer to «Fuel System Diagnosis»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . Fuel that is contaminated-Refer to «Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) or «Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-troubleshooting-diagnosis) . A collapsed air intake duct A restricted air filter element Exhaust system restrictions Excessive fuel in the crankcase An engine mechanical condition-Refer to «Symptoms - Engine Mechanical»(/chevrolet/camaro/v-2009-2013/remont/mechanical/#engine-mechanical-36l-diagnostic-information-and-procedures) . If you find any of the above conditions, repair as necessary.
  5. If all circuits/connections test normal, replace the appropriate B52 HO2S 2.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Heated Oxygen Sensor Replacement - Bank 1 Sensor 2»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  2. «Heated Oxygen Sensor Replacement - Bank 2 Sensor 2»(/chevrolet/camaro/v-2009-2013/remont/testing-diagnostics/#engine-controls-and-fuel-36l-repair-instructions)
  3. «Control Module References»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for engine control module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/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»(/chevrolet/camaro/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
IGN VoltageP2534P2534

The fuel pump control module monitors the ignition voltage circuit in order to determine if the voltage is within the normal operating range.

The engine is running.

The FPCM detects that the IGN voltage is less than 6.0 V.

DTC P2534 is a Type A DTC.

DTC P2534 is a Type A DTC.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
  4. «Wiring Repairs»(/chevrolet/camaro/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 P0562 is not set. If DTC P0562 is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/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 of the K27 fuel pump control module.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 21 and ground. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  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 fuel pump control module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/camaro/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»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for a overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

To improve shift feel, the transmission control module (TCM) is constantly sending the engine control module (ECM) serial data messages with information regarding it's request for modifying engine speed or torque. The serial data messages are sent through two circuits which are part of a communication network called the controller area network (CAN). The ECM sets DTC P2544 when it detects a discrepancy in the structure of the message causing the integrity of the message to be questioned.

An intermittent fault in the CAN circuits will cause the ECM to set DTC P2544.

  1. The engine run time is greater than 0.5 s.
  2. No other CAN errors are present.

The ECM detects that the engine speed and torque modification messages from the TCM are either corrupted or intermittently missing for greater than 4 s.

  1. DTC P2544 is a Type B DTC.
  2. The TCM commands maximum line pressure during shifts, which results in harsh shifts.
  3. The TCM freezes adaptive functions.

DTC P2544 is a Type B DTC.

DTC Type Reference

  1. DTC P2544 is an informational DTC. Diagnose all other engine control DTCs prior to DTC P2544. Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/camaro/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. If there are no other engine controls DTCs, diagnosis is accomplished by looking for an intermittent CAN circuit fault. Refer to «Scan Tool Does Not Communicate with High Speed GMLAN Device»(/chevrolet/camaro/v-2009-2013/remont/communication-devices/#data-communications-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Engine Controls Schematics
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Engine Control Module Description
• Throttle Actuator Control (TAC) System Description
• Special Tools
• DTC P0121-P0123 or P0221-P0223
• Throttle Body Assembly Replacement
• Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (LLT)
• Clutch Pedal Position Sensor Replacement
• Engine Oil Pressure Sensor and/or Switch Replacement (LCS)
• Instrument Cluster Gauges Inoperative
• Battery Inspection/Test
• Power Distribution Schematics
• Electrical Center Identification Views
• Relay Replacement (Attached to Wire Harness)
• Diagnostic Trouble Code (DTC) List - Vehicle
• DTC P0231, P0232, or P023F
• Symptoms - Antilock Brake System
• Fuel Injector Solenoid Coil Test
• Road Test Warning
• Exhaust Leakage
• Altitude Versus Barometric Pressure
• Symptoms - Engine Exhaust
• Fuel System Cleaning
• Symptoms - Engine Mechanical
• Scan Tool Does Not Communicate with High Speed GMLAN Device
• Circuit/System Testing

More articles — Engine Performance