Set when the control module of an automated manual gearbox drives the shift actuator towards a gear, but the measured shift position does not reach the target within the allowed time and tolerance. Sensor and actuator circuits can be electrically intact; the fault concerns the closed loop as a whole. Usual reasons are a stiff or jammed shift rail or synchroniser, a weak actuator, low hydraulic pressure on hydraulic units, or a sensor offset. No manufacturer documents this code publicly. A Hyundai/Kia patent detects jammed shift actuators from motor current, and an Isuzu patent controls the shift motor by stroke ranges using a shift stroke sensor. CARB requires functional checks on such outputs. P0909 is the same error in the select direction, P0920 to P0927 the actuator circuits. Gears may not engage.
Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
Symptoms
- Transmission warning light on
- Gear does not engage or engages only after a delay
- Gearbox remains in neutral or locks in one gear
Most likely causes
- Stiff or jammed shift rail, shift fork or synchroniser
- Worn shift motor or leaking shift cylinder that no longer delivers full force
- Low pressure in the hydraulic supply on hydraulically actuated units
- Shift positions not relearned after actuator or module replacement
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 P0919 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 9: Transmission
- 19: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0919?
Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
What causes code P0919?
The most common causes are: stiff or jammed shift rail, shift fork or synchroniser; worn shift motor or leaking shift cylinder that no longer delivers full force; low pressure in the hydraulic supply on hydraulically actuated units.
Related codes
- P0909Gate Select Control Error
- P0914Gear Shift Position Circuit A
- P0915Gear Shift Position Circuit A Range/Performance
- P0920Gear Shift Forward Actuator Circuit/Open
- P0924Gear Shift Reverse Actuator Circuit/Open
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.