VOLVO
TRM-U201449 - Control Module Hardware. System Internal Failures. Internal electronic failure
System
Trailer Module (TRM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The tow hitch control module (TRM) has detected an electrical fault in its internal hardware. In older software versions this code may be set in place of TRM-B10D668, which concerns a cable fault to the trailer. The trailer lighting may then stop working.
Possible causes
- Incorrect software in the tow hitch control module (TRM)
- Damaged tow hitch control module (TRM)
What you can do
- 1Test the trailer lights with a working trailer
- 2Check whether the code is still present after the test
- 3Have a workshop download the latest software to the tow hitch control module
- 4If the fault remains, the tow hitch control module needs replacing, which a workshop should carry out
Symptoms you may notice1
- Trailer lighting does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.