What does code P284D mean?

Q: What does code P284D mean?

Shift Fork A Unrequested Movement. This code indicates that the transmission control module (TCM) has detected movement of shift fork A that it did not command, meaning the fork has slipped or been moved by something other than the actuator. The TCM monitors fork position sensors and actuator commands, and when the reported fork position changes without a corresponding command, it sets this fault.

DTC codes / P28xx · Transmission / P284D

P284DShift Fork A Unrequested Movement

This code indicates that the transmission control module (TCM) has detected movement of shift fork A that it did not command, meaning the fork has slipped or been moved by something other than the actuator. The TCM monitors fork position sensors and actuator commands, and when the reported fork position changes without a corresponding command, it sets this fault.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.