Set when the control module of an automated manual gearbox commands the select actuator to a new gate, but the measured select position does not reach the target within the allowed time and tolerance. Sensor and actuator circuits may be electrically fine; the fault lies in the closed loop as a whole. Typical reasons are a jammed or stiff select shaft or shift head, a worn or weak select motor, or a sensor offset. No manufacturer documents this code publicly. An Aisin AI patent describes select control with target and actual gates, and a Hyundai/Kia patent detects jammed or stuck shift actuators from motor current. CARB requires functional checks on such outputs. P0910 to P0913 are the actuator circuit faults, P0919 the same error in the shift direction. The gearbox may refuse gears or stay in neutral.
Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
Symptoms
- Check engine or transmission warning light on
- Certain gears cannot be engaged or gearbox stays in neutral
- Clicking or whirring from the actuator without a gear change
Most likely causes
- Stiff or jammed select shaft, shift head or internal selector mechanism
- Worn select motor (brushes, gears) with too little force
- Select sensor offset or gate positions not relearned
- Weak battery or voltage drop on the actuator supply
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P0909 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 9: Transmission
- 09: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0909?
If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.
What causes code P0909?
The most common causes are: stiff or jammed select shaft, shift head or internal selector mechanism; worn select motor (brushes, gears) with too little force; select sensor offset or gate positions not relearned.
Related codes
- P0905Gate Select Position Circuit A Range/Performance
- P0910Gate Select Actuator Circuit/Open
- P0911Gate Select Actuator Circuit Range/Performance
- P0919Gear Shift Position Control Error
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.