What does fault code TCM-0492 mean?

Diagnostic fault code details for TCM-0492 (Volvo C30 (2007–2013), Volvo C30 (2007–2013), Volvo C30 (2007–2013)). Repair service at OBD Tuning.

VOLVO

TCM-0492 - Oil temperature sensor. Signal outside its permitted range

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 oil temperature sensor in the transmission gives a signal outside a predefined value. The transmission has temperature sensors that give the control module information about the temperature of the oil and of the electrical components.

Possible causes

The sensor is damaged

What you can do

1Read out the fault codes from the transmission control module, such as another temperature fault code, and deal with those first
2With diagnostic equipment, compare the oil temperature from the sensors in live data with the room temperature while the transmission is cold
3After a short road test with some gear changes, read the oil temperature again; the temperature should have risen by about the same amount
4If the readings are not reasonable, the fault is permanent. If they are reasonable and match, it was probably present before but is not active now
5If the fault is inside the control module or its components, the mechatronic unit must be replaced, which a workshop should do

Symptoms you may notice1

No noticeable symptoms for the driver

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