Powertrain, generic (extended)

P284D Shift Fork A Unrequested Movement

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Gear position sensors poorly calibrated (Audi DL382/DL552)
Transmission software needing an update
Leaking fork A actuator or weak detent letting the rod creep

Symptoms

  • Message about a drive system fault with limited performance
  • First or seventh gear cannot be selected (Audi report)
  • Gear may jump out under load

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,500
Time0–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift fork ashift fork actuator adetent spring

Related codes

P284EP284FP2850P286AP2832

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, fordservicecontent.com.