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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0976 or P0977 >> Circuit/System Verification

Circuit/System Verification

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  1. Operate the vehicle in 3rd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
  2. Place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds. Verify with a scan tool the following test status parameters displays OK:
    • Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
    • Shift Solenoid Valve 2 Control Circuit Open Test Status
    • Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
    • If any test status parameter displays Fault or Malfunction 

      Refer to Circuit/System Testing below.

    • If all test status parameters display OK 
  3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections .
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