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Home >> Chevrolet >> 2010 >> Camaro LS, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 6.2L - DTC P1380 To DTC P3449) >> DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0641 or P0651 are not set.
  2. Observe the scan tool APP sensor 1 and 2 voltage parameters. The reading should be between 0.46-4.75 V for APP 1 and 0.325-4.75 V for APP 2, and change with accelerator pedal input.
  3. Observe the scan tool APP Sensor 1 and 2 Agree/Disagree parameter while performing the following tests:
    • Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times.
    • Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.

      The APP Sensor 1 and 2 Agree/Disagree parameter should display Agree.

  4. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC or within the conditions that you observed from the Freeze Frame/Failure Records.
  5. Ignition ON, observe the DTC information with a scan tool. Verify that DTC P2120 or P2125 are not the only APP sensor DTCs set.
    • If DTC P2120 or P2125 are the only DTCs set, replace the ECM.
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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