VOLVO
TCM-04A2 - Communication between control units. Invalid data recieved from engine control module (ECM)
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 transmission control module (TCM) has received poor-quality signals from the engine control module (ECM) over the CAN bus. The two control modules exchange many signals to protect the car's parts and keep driving safe and comfortable, and this code points to a fault in the engine control module.
Possible causes
- Fault in the engine control module (ECM)
What you can do
- 1First read out the fault codes in the engine control module and in the central electronic module (CEM) and remedy them
- 2Do not clear this fault code until the codes in the engine control module and the CEM have been remedied and cleared
- 3If no codes are stored but the fault remains after clearing, have a workshop trace the CAN network
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.