VOLVO
TCM-0490 - Temperature sensor control module. Faulty signal
System
Transmission Control Module (TCM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (10)
- Volvo C30 (2007–2013)2008Engine D4204T only · Transmission MPS6 only
- Volvo C30 (2007–2013)2009–2010Engine B4204S3, D4204T only · Transmission MPS6 only
- Volvo C30 (2007–2013)2011–2013Engine B4204S3 only · Transmission MPS6 only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MPS6 only
- Volvo S40 (2004–2013)2008Engine D4204T only · Transmission MPS6 only
- Volvo S40 (2004–2013)2009–2010Engine B4204S3, D4204T only · Transmission MPS6 only
- Volvo S40 (2004–2013)2011–2012Engine B4204S3 only · Transmission MPS6 only
- Volvo V50 (2004–2013)2008Engine D4204T only · Transmission MPS6 only
- Volvo V50 (2004–2013)2009–2010Engine B4204S3, D4204T only · Transmission MPS6 only
- Volvo V50 (2004–2013)2011–2012Engine B4204S3 only · Transmission MPS6 only
What does this fault code mean?
The temperature sensor in the transmission control module (TCM) gives a signal that changes too quickly. The sensor is built into the processor and reads its internal temperature, and the control module reacts when the temperature rises or falls too quickly.
Possible causes
- The sensor is damaged
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
- 2With diagnostic equipment, read the oil temperature from both sensors in live data with the transmission at room temperature
- 3After a short road test with some gear changes, read the oil temperature again; both sensors should have risen by about the same amount
- 4If the readings are not reasonable, the fault is permanent. If they are reasonable and agree, it was probably present earlier 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.