What does fault code TCM-0438 mean?

Diagnostic fault code details for TCM-0438 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0438 - Shift fork. Shift fork 1 requested but movment on shift fork 2

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?

The transmission control module (TCM) has requested a movement of shift fork 1, but shift fork 2 moves instead. The cause lies in one of the solenoids that controls whether the odd or the even gears are used, and the fault means the mechatronic unit must be replaced.

Possible causes

Damaged solenoid for selecting odd gears
Damaged solenoid for selecting even gears

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
2The fault means the mechatronic unit must be replaced, and a workshop should do this
3If the control module is also replaced, it must be programmed by a workshop, because a replacement control module arrives without software
4Then read out the fault codes again to see whether the fault code remains

Symptoms you may notice5

Check engine light comes on or behaves abnormally
Text window with yellow warning symbol and message
No automatic gear changes
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.