Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.

Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
Observe the scan tool data parameter Line PC Sol. CKT Status, the parameter should display OK.
- If the parameter displays Open, Short to Volts, Short to GND or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
- If no concerns are found during the inspection, replace the control solenoid (w/body and TCM) valve assembly.