What it means
Clutch A disengagement pressure exceeds the calibrated maximum. The clutch may not separate cleanly.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Clutch A must release to separate engine torque from the transmission during a shift, and the control module monitors hydraulic pressure during disengagement. This code sets when clutch A disengagement pressure exceeds its calibrated maximum, which may prevent the clutch from separating cleanly.
Common causes
Most likely first.
- Pressure regulator stuck at high output
- Control solenoid characteristic drift
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Record freeze-frame data and compare commanded and measured clutch A pressure during disengagement to verify the excessive reading occurs as the clutch releases.
- Note whether the transmission drags, shifts harshly, or struggles to change gear when clutch A should disengage.
- Inspect clutch A solenoid wiring and connectors for corrosion, loose pins, or damage that could interfere with pressure control.
- Check transmission fluid level and condition according to the manufacturer's procedure and look for other hydraulic control codes.
- Test the pressure regulator and clutch A control solenoid during disengagement against the manufacturer's specification.
Common fixes
- Correct fluid level or condition if it does not meet the manufacturer's requirements.
- Repair corroded connectors or damaged wiring serving the clutch A control solenoid.
- Repair or replace the pressure regulator if it maintains excessive output during disengagement.
- Replace or recalibrate the clutch A control solenoid if testing confirms drift.
Can I keep driving?
Keep driving to a minimum because excess pressure while clutch A should release can cause dragging, harsh shifts, and additional clutch wear. Stop if the vehicle struggles to disengage or select gears, and arrange recovery if control is unreliable.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.