The transmission control system is performing outside its expected range. Read the TCU sub-code with a Porsche-capable tool.
SYMPTOMS
- Check-engine light
- Gearbox fault message
- Harsh or erratic shifts
- Possible limp mode
LIKELY CAUSES
- Mechatronic/solenoid fault
- Degraded transmission fluid
- Sensor fault
- Wiring fault
DIAGNOSIS STEPS
- Read TCU-specific sub-codes with a Porsche-capable scanner
- Check fluid level/condition and service history
- Inspect wiring and connectors
RELATED PARTS
- Mechatronic unit
- PDK fluid