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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 P0667, P0668, or P0669 >> Circuit/System Verification

Circuit/System Verification

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  1. Engine idling at normal operating temperature, verify the scan tool TCM Temperature parameter is between -247 and +247°C (-412 and +477°F).
    • If not within the specified range, replace the Q8 control solenoid valve assembly.
  2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the TCM Temperature parameter and the Transmission Fluid Temperature parameter with a scan tool. The TCM Temperature parameter should increase by more than 2°C (3.5°F). Also, the TCM Temperature parameter and the Transmission Fluid Temperature parameter should be within 10°C (18°F) of each other.
    • If the TCM Temperature parameter does not increase by more than 2°C (3.5°F) or the TCM Temperature parameter value is not within 10°C (18°F) of the Transmission Fluid Temperature parameter, then replace the Q8 control solenoid valve assembly.
  3. 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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