What it means
Clutch B 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 B must release cleanly when its hydraulic actuator removes the pressure that applies it. The transmission module monitors Clutch B disengagement pressure; this code sets when pressure during release exceeds the calibrated maximum, so the clutch may not separate fully.
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
- Save the freeze-frame and transmission data, then compare commanded and actual Clutch B pressure during disengagement.
- Check transmission fluid level and condition for problems that could interfere with pressure control or release.
- Inspect the transmission connector and accessible wiring for damage, corrosion, or loose connections affecting the Clutch B regulator or solenoid.
- Graph commanded versus actual Clutch B pressure during release with a scan tool and verify that actual disengagement pressure stays too high.
- If the pressure remains high, test the regulator and Clutch B control solenoid for sticking or characteristic drift using the manufacturer's procedure.
Common fixes
- Correct transmission fluid level or condition according to the manufacturer's requirements.
- Repair damaged wiring or poor connections in the Clutch B pressure-control circuit.
- Repair or replace a pressure regulator stuck at high output.
- Replace or calibrate the Clutch B control solenoid if testing confirms characteristic drift.
Can I keep driving?
Avoid heavy acceleration and repeated gear changes because Clutch B may not separate cleanly, causing harsh shifts and additional clutch wear. If shifting becomes unpredictable or limp mode engages, stop safely and arrange service.
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.