Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Perform the Line Pressure Check . Verify the transmission line pressures are within the specified ranges.
- If not within the specified ranges, refer to Fluid Pressure High or Low .
- Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test . Test all solenoids on the Q8 control solenoid valve assembly. A pressure change should occur for each solenoid.
- If the Q8 control solenoid valve assembly does not pass the performance test, replace the Q8 control solenoid valve assembly.
- Listed in the chart below are conditions for each component that could set DTC P0751 or P0752. Carefully inspect each component for that condition. Repair or replace as necessary.
| DTC | Component | Condition |
|---|---|---|
| P0751 P0752 |
Lower Control Valve Body | Clutch select valve 2 stuck - debris, sediment, binding or scored bore |
| P0751 | Upper Control Valve Body | Bore Plug - Clutch Select Valve 2, Leaking, undersized bore plug, or damaged |
| P0751 | Upper Control Valve Body |
|
| P0751 P0752 |
Q8 Control Solenoid Valve Assembly | Shift Solenoid (SS) 1:
|