The torque-converter/clutch lock-up is not engaging as commanded. On PDK this maps to clutch engagement control.
SYMPTOMS
- Check-engine light
- Slipping
- Poor shift quality
LIKELY CAUSES
- Solenoid/mechatronic fault
- Degraded fluid
- Clutch wear
- Wiring fault
DIAGNOSIS STEPS
- Read TCU sub-codes
- Check fluid condition
- Inspect solenoid and clutch data
RELATED PARTS
- Mechatronic unit
- Clutch
- PDK fluid