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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0634 >> Circuit/System Verification

Circuit/System Verification

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    NOTE:

    If DTC P0218 is set, diagnose that DTC first.

  1. Perform the Transmission Fluid Level and Condition Check  to verify correct fluid level and condition.
  2. Operate the vehicle to normal engine temperature is reached. Verify with a scan tool the engine coolant temperature (ECT) sensor parameter is less than 125°C (257°F).
  3. Operate the vehicle till normal engine temperature is reached. Verify with a scan tool, the TCM temperature parameter is less than 142°C (287°F).
    • If greater than the specified value, inspect the transmission fluid lines for being misrouted, kinked, or damage.
  4. If all items test normal, replace the Q8 control solenoid valve assembly.
  5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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