OBD-II code · Powertrain (generic, extended)
P284D Shift Fork A Unrequested Movement
Shift fork A moves without an actuator command. Hydraulic leakage at the actuator or detent spring failure.
Is it safe to drive with P284D?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyInternal leak in fork actuator
- PossibleDetent spring or ball failed
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
- 4–12 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Fork A, Shift Fork Actuator A, Detent Spring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.