Circuit/System Testing

Engine idling at the normal operating temperature.
WARNING: Refer to Parking Brake and Drive Wheels Warning .

NOTE: You must perform Circuit/System Verification first.
Verify the transmission line pressures are within the specified range. Refer to Line Pressure Check and Solenoid Valve Pressure (Gen 2) .
- If the pressures are not within range
  Refer to Fluid Pressure High or Low .
- If the pressures are within range
Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
Verify the pressure changes for all solenoids when performing the solenoid test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
- If the pressure does not change
  Replace the Q8 Control Solenoid Valve Assembly.
- If the pressure changes
Verify the mechanical conditions listed below do not exist. Repair or replace as necessary.

P0751 - Control Valve Body

Clutch select valve bore plug undersized. Plug should be a valve fit in the bore.
Check ball #1 missing, damaged/malformed.
Seat for check ball #1 damaged or leaking.

P0751 or P0752 - Control Valve Body

Clutch select valve stuck from debris, sediment, binding or a scored bore.
Low and reverse and 4-5-6 clutch regulator valve stuck or sticking from debris, sediment, binding or a scored bore.

P0751 or P0752 - Channel Plate and Spacer Plate

Oil channels or orifices blocked by debris.

P0751 or P0752 - Q8 Control Solenoid Valve Assembly

Not pressurizing due to shift solenoid valve 1 being stuck OFF or leaking.
Pressure not exhausting due to shift solenoid valve 1 being stuck ON.
Control signal fluid supply leak due to valve body filter plate assembly cracked, blocked or damaged gasket seal.

P0752 Output Carrier Assembly

Output carrier pinion pins too high or too low.