What does fault code TCM-0433 mean?

Diagnostic fault code details for TCM-0433 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0433 - Shift fork 4. Shift fork movement but not requested

System

Transmission Control Module (TCM)

Volvo models this fault code applies to

Applies to the following models:

4 models

C30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)

Show models by year and engine (10)

What does this fault code mean?

Shift fork 4 has moved away from the N position without the transmission control module (TCM) having requested any movement. The cause is either the hydraulic system or the position sensor, and both can be in the mechatronic unit.

Possible causes

Fault in the hydraulic system
Damaged position sensor

What you can do

1Read out the fault codes from the transmission control module and deal first with any codes that may share the same cause
2If you have diagnostic equipment, check in live data whether the position value for shift fork 4 changes when the selector is in N
3Both fault sources can be in the mechatronic unit, so a workshop should replace it, road test the car and then read out whether the fault code remains

Symptoms you may notice5

Check engine light comes on or behaves abnormally
Message with yellow warning symbol in the display
No forward or reverse movement with a gear selected
Shifts occur too early, too late or too often, sometimes or all the time
Gear changes take too long to complete, sometimes or all the time

General guidance for car owners. Diagnosis on the car can point to a different cause.