Gate Select Actuator Circuit Low
What it means
P0912 means the gate-select actuator control circuit reads an abnormally low voltage. On an automated-manual transmission this actuator moves the shift mechanism across the "gates" to line up the right rail before a gear is engaged. The engine still starts, but if the actuator can't be driven properly you may struggle to select some gears or get stuck in one. It's typically a wiring or actuator fault worth diagnosing before it strands you.
Can I keep driving? The engine starts, but on an automated-manual gearbox the gate-select actuator moves between shift rails — if it can't operate you may be unable to select some gears, so get it checked promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Difficulty selecting or engaging certain gears
- Stuck in a gear position
- Rough or failed automatic shifts
Common causes
Most likely first
- Open or short to ground in the gate-select actuator wiring (reads low)Likely
- Loose or corroded connector at the actuatorCommon
- Faulty gate select actuatorCommon
- Low system voltage feeding the actuatorLess often
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the actuator connector and wiring for damage, corrosion, or shorts to ground.
- Confirm system voltage is normal, then measure the actuator's resistance and control voltage against service data.
- Replace the gate select actuator if it fails its electrical checks.
- If wiring and actuator are good, suspect the TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0912?+
Can I just clear P0912?+
Related codes
Often seen with P0912
Read & clear P0912 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.