VOLVO
TCM-0A01 - Communication control module. Signal missing
System
Transmission Control Module (TCM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (6)
- Volvo C30 (2007–2013)2007–2013Transmission AW55-50/51SN only
- Volvo C70 (2006–2013)2006–2013Transmission AW55-50/51SN only
- Volvo S40 (2004–2013)2004, 2011–2012Transmission AW55-50/51SN only
- Volvo S40 (2004–2013)2005–2010Transmission AW50/51 AWD, AW55-50/51SN only
- Volvo V50 (2004–2013)2004, 2011–2012Transmission AW55-50/51SN only
- Volvo V50 (2004–2013)2005–2010Transmission AW50/51 AWD, AW55-50/51SN only
What does this fault code mean?
The transmission control module is missing a vehicle speed signal from the brake control module (BCM) on the CAN network. The transmission uses this signal to check its speed and RPM sensors. The fault comes from a problem in the brake control module or from the CAN network.
Possible causes
- Fault in the brake control module (BCM)
- Fault on the CAN
What you can do
- 1Start by reading the fault codes in the CEM and the brake control module and fix them. Do not clear TCM-0A01 until their fault codes are fixed
- 2Have a workshop carry out the fault tracing on the CAN network and the brake control module with diagnostic equipment
- 3Once the other fault codes are gone, drive the car and see whether TCM-0A01 comes back
- 4The brake system is safety-critical. If you suspect a fault, have a workshop check it
Symptoms you may notice1
- General warning lamp lit.
General guidance for car owners. Diagnosis on the car can point to a different cause.