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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 256 (Automatic Transmission - 2ML70 - DTC P0969 To DTC P279D) >> DTC P0969, P0970 or P0971 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

Perform the following procedure to place the control solenoid (w/body and TCM) valve assembly under the optimal conditions to test solenoid electrical DTCs.

  1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature, then operate the vehicle in 4th gear for 5 seconds.
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