A transmission pressure control solenoid is stuck or underperforming.
SYMPTOMS
- Check-engine light
- Harsh or soft shifts
- Slipping
LIKELY CAUSES
- Stuck/failed pressure solenoid
- Degraded fluid
- Mechatronic fault
- Wiring fault
DIAGNOSIS STEPS
- Read TCU sub-codes
- Check fluid condition
- Test solenoid operation
RELATED PARTS
- Mechatronic unit
- Solenoid pack