Electrical fault in the transmission control system.
SYMPTOMS
- Check-engine light
- Gearbox fault message
- Harsh shifts
- Limp mode
LIKELY CAUSES
- Solenoid/mechatronic electrical fault
- Wiring or connector fault
- TCU fault
DIAGNOSIS STEPS
- Read TCU sub-codes with a Porsche-capable tool
- Inspect wiring and connectors
- Check solenoid resistances
RELATED PARTS
- Mechatronic unit
- Solenoid pack