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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 P0741 or P0742 >> Circuit/System Verification

Circuit/System Verification

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    NOTE:

    If other DTCs are set, diagnose those DTCs first.

  1. Engine idling in Park position, with parking brake applied and drive wheels chocked.
  2. Verify transmission fluid level and condition. Refer to Transmission Fluid Level and Condition Check .
  3. Ingnition ON, clear the TCM DTCs.
  4. Perform the Road Test . Verify the transmission operation performs as indicated in the road test instructions and DTCs P0741 or P0742 did not set.
    • If DTCs P0741 or P0742 are set 

      Refer to Circuit/System Testing below.

    • If DTCs P0741 or P0742 did not set 
  5. 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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