Circuit/System Testing

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.

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	Check Ball #2 missing, damaged, or leaking Check Ball #2 Seat damaged or leaking
P0751 P0752	Q8 Control Solenoid Valve Assembly	Shift Solenoid (SS) 1: O-ring seals leaking Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal