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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 6.2L - DTC P1255 To DTC P2635 >> DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool APP sensor 1 voltage parameter. The reading should be between 0.35-4.75 volts, and change with accelerator pedal input.
  2. Ignition ON, observe the scan tool APP sensor 2 voltage parameter. The reading should be between 0.32-4.75 volts, and change with accelerator pedal input.
  3. Ignition ON, observe the scan tool APP sensor 1 and 2 parameter. The scan tool should indicate 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.
    • If DTC P2120 or P2125 are the only DTCs set, replace the control module.
    • If DTC P0641 or P0651 are set, refer to DTC P0641 or P0651 .
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