What does fault code TCM-0412 mean?

Diagnostic fault code details for TCM-0412 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0412 - Shift fork 3. Plausible position

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 found that the position of shift fork 3 is unreasonable. Shift fork 3 is one of four forks that engage the gears, and each fork has its own position sensor that reports its position to the control module. The fault may lie in the sensor, the voltage supply or the control module.

Possible causes

Damaged position sensor
The sensor has an incorrect position
Incorrect voltage supply to the sensor
Damaged transmission control module (TCM)

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, since a fault in the gearbox often sets several codes
2If you have diagnostic equipment, compare the position value for shift fork 3 with the others in live data and see whether anything stands out clearly
3If readings are within limits, the fault has probably been sporadic; clear the code and road test to see whether it returns
4If a value is outside or at the limit, a workshop should replace the mechatronic unit; a fault inside the control module needs a new, programmed module

Symptoms you may notice5

Check engine light comes on or behaves abnormally
Text window with yellow warning symbol and message
Gears shift hard or jerky, sometimes or all the time
Gear changes take too long to complete, sometimes or all the time
Gears shift too early, too late or too often, sometimes or all the time

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