P0912: Gate Select Actuator Circuit Low OBD-II Trouble Code

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.

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What Transmission Do I Have?

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

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

Causes

  • 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

Related Codes

N/A

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?