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
.
- 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 P1751. Carefully inspect each component for that condition. Repair or replace as necessary.
| DTC | Component | Condition |
|---|---|---|
| P1751 | Lower control valve body (307) | Clutch select valve 2 spring broken, debris, or damage |
| P1751 | Control Valve Body Spacer (w/gasket) Plate Assembly (305) | Orifice # 23 blocked, obstructed, or irregular shaped |
| P1751 | Control Valve Body Spacer (w/gasket) Plate Assembly (305) | Checkball # 4 ball seat blocked, obstructed, or irregular shaped (burr or flashing on hole/s) |
| P1751 | Control Valve Upper Body Assembly (304) | Checkball # 4 damaged or irregular shaped |
| P1751 | Q8 Control Solenoid Valve Assembly (314) | Control signal fluid supply leak - valve body filter plate assembly cracked or damaged gasket seal |