P284D

Shift Fork A Unrequested Movement

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Incorrect gear shifting
Switching delays
Switching to emergency mode of the gearbox
Unusual noises from the transmission
Check Engine Light Illuminates

Causes

Worn or damaged shift fork
Problems with the hydraulic system (leaks, low fluid levels)
Shift solenoids malfunction
Problems with position sensors
Errors in TCM software

How to Fix

Check the level and condition of the transmission fluid
Diagnose the operation of switching solenoids
Check position sensors and their wiring
Scan TCM for errors and update software if necessary
If necessary, replace the shift fork or other mechanical components

Related codes

P284C P284E P2850