OBD-II code · Powertrain (generic)
P0921 Gear Shift Forward Actuator Circuit Range/Performance
The gear shift forward actuator circuit reports a range/performance fault. Forward gear engagement is impaired.
Is it safe to drive with P0921?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyActuator fault
- PossibleWiring fault
- Less likelySensor element aged beyond calibration window
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
- Gear Shift Forward Actuator, Wiring Harness, Tcm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.