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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 P06AC, P06AD, or P06AE >> Circuit/System Verification

Circuit/System Verification

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, clear the DTCs with a scan tool.
  2. Operate the vehicle at 64 km/h (40 mph) for 10 minutes. Monitor the TCM Power-Up Temperature parameter and the TCM Temperature parameter with a scan tool. The TCM Power-Up Temperature parameter and the TCM Temperature parameter should be within 10°C (18°F) of each other.
    • If the TCM Power-Up Temperature parameter is not within the specified value of the TCM Temperature parameter 

      Then replace the Q8 control solenoid valve assembly.

    • If the TCM Power-Up Temperature is within the specified value 
  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. Refer to Testing for Intermittent Conditions and Poor Connections .
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