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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 514 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify DTC P0641 or P0651 is not set.
    • If none of the DTCs are set 
  3. Verify the scan tool APP Sensor 1 voltage parameter is between 0.45-4.74 V and changes with accelerator pedal input.
    • If not between 0.45-4.74 V or does not change 

      Refer to Circuit/System Testing

    • If between 0.45-4.74 V and changes 
  4. Verify the scan tool APP Sensor 2 voltage parameter is between 0.33-2.5 V and changes with accelerator pedal input.
    • If not between 0.33-2.5 V V or does not change 

      Refer to Circuit/System Testing

    • If between 0.33-2.5 V and changes 
  5. Verify the scan tool APP Sensor 1 and 2 Agree/Disagree parameter displays Agree while performing the tests listed below:
    • 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.
    • If Disagree 

      Refer to Circuit/System Testing

    • If Agree 
  6. Verify that DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 is not set.
    • If any of the DTCs are set 

      Refer to Circuit/System Testing

    • If none of the DTCs set 
  7. 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.
  8. Ignition ON.
  9. Verify DTC P2120 or P2125 are not the only APP sensor DTCs set.
    • If any of the DTCs are set 
    • Replace the engine control module.
    • If none of the DTCs set 
  10. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  11. Verify a DTC does not set.
    • If no DTCs set 
  12. All OK
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