Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If DTC P0218 is set, diagnose that DTC first.

Perform the Transmission Fluid Level and Condition Check to verify correct fluid level and condition.
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).
- If greater than the specified value, refer to Symptoms - Engine Cooling .
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.
If all items test normal, replace the Q8 control solenoid valve assembly.
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.