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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 P0658 or P0659 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, verify with a scan tool the high side driver 1 parameter displays ON.
    • If the high side driver 1 parameter displays OFF 

      Continue with Circuit/System Testing below.

    • If the high side driver 1 parameter displays ON 
  2. Engine Running, gear selector lever in Park position. Verify with a scan tool the following test status parameters displays OK:
    • High Side Driver 1 Circuit High Voltage Test Status
    • High Side Driver 1 Circuit Open Test Status
    • High Side Driver 1 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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