A transmission gate select actuator assembly contains several sensors and an electric motor. The ECU reads data coming from the sensors, then activates the electric motor to engage a gear based upon the position of the shift lever. If there is an unusually low voltage signal on the gate select actuator circuit, a P0912 DTC will be saved.
How Serious is the Code?
If the ECU cannot use the gate select actuator to engage the gear you have selected, you will experience a number of drivability problems including erratic shifting and clutch slipping.
Symptoms of a P0912 include:
- Harsh shifts
- Delayed shifts
- Erratic shift patterns
- Transmission seems to get stuck in gear
- Failed gear engagement
- Clutch slipping
- The engine seems to misfire
- Defective shifter
- Defective clutch position sensor
- Defective clutch actuator
- Control linkages out of adjustment
- Damaged wiring and/or connectors
- Defective clutch or transmission
How to Diagnose the Code?
Due to the complexity of most semi automatic transmissions, diagnosing a P0912 OBDII trouble code will require the manufacturer’s troubleshooting process. But for the most part, it involves a series of electrical and mechanical tests.
What Repairs Will Fix P0912?
- Replace shifter mechanism
- Replace clutch position sensor
- Replace clutch actuator
- Replace clutch
- Repair or replace damaged wiring or connectors
- Adjust or repair control linkages
- Repair or replace transmission