- Faulty variable forced solenoid valve
- Variable forced solenoid valve harness or connectors
- Variable forced solenoid valve circuit is open or shorted
- Low transmission fluid level
- Dirty transmission fluid

The gear required by the Engine Control Module (ECM) does not match the actual gear when driving

- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock

The Variable Forced Solenoid regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).