Circuit/System Verification
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Perform the Transmission Fluid Level and Condition Check .
- Perform the Line Pressure Check .
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
- If the shift solenoid 2 is found to be leaking or stuck OFF, replace the Q8 control solenoid valve assembly.
- If the Q8 control solenoid valve assembly tests normal, inspect the valve body and hydraulic circuits for a leak or a stuck valve.
- Listed in the chart below are conditions for each component that could set DTC P0756. Carefully inspect each component for that condition. Repair or replace as necessary.
| DTC | Component | Condition |
|---|---|---|
| P0756 | Control Valve Body Upper Assembly (343) | Shift Solenoid Valve Mode B (332) stuck - debris, sediment, binding or scored bore |
| P0756 | Control Valve Channel Plate (304) | Control Valve Channel Plate damaged or contaminated with large debris |
| P0756 | Control Solenoid Valve Assembly (307) | Shift Solenoid (SS) 2:
|
| P0756 | Control Solenoid Valve Assembly (307) | Pressure Switch 1:
|
| P0756 | Hybrid direct, 2-3-4 clutch | slipping or damaged |
| P0756 | Hybrid low, 1-2 clutch | slipping or damaged |