OBD-II code · Powertrain (generic)
P0909 Gate Select Control Error
The TCM detects that the gate select actuator does not reach the commanded position within tolerance. Mechanical bind, weak actuator, or sensor offset.
Is it safe to drive with P0909?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySelector mechanism binding
- PossibleActuator force degraded
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Gate Select Actuator, Gate Select Position Sensor, Tcm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.