P284DShift Fork A Unrequested Movement
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P284D means fork A has crept away from the position of the gear it is supposed to hold, without any shift being commanded. Several makers use it. Audi bulletin 2078846 covers 2025 A5 and Q5 models with the DL382 and DL552 dual-clutch boxes: the cluster reports a drive system fault with limited performance, and if guided fault finding finds no cause, the gear position distance sensors G487 to G490 are calibrated ten times in a row; a later revision adds a combined software update. Mercedes-Benz names P284D00 for its 8G-DCT, and Ford's 2024 summary links it to rod drift of shift rod 1 in the TR9070. GM's Corvette software runs it as a Type A drift check on rod 1, after which a synchronizer recovery routine starts on the odd shaft.
- What you may notice
- Message about a drive system fault with limited performance
- First or seventh gear cannot be selected (Audi report)
- Gear may jump out under load
- Likely causes
- LikelyGear position sensors poorly calibrated (Audi DL382/DL552)
- PossibleTransmission software needing an update
- PossibleLeaking fork A actuator or weak detent letting the rod creep
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.