VOLVO
TRM-C042 - Control Module. System Internal Failures
System
Trailer Module (TRM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsC30 (2007–2013), C70 (2006–2013)
Show models by year and engine (2)
What does this fault code mean?
The tow hitch control module (TRM) has registered that internal components in the module are not working. The fault lies in the module itself, and the trailer lighting may stop working.
Possible causes
- Damaged tow hitch control module (TRM)
What you can do
- 1Disconnect the battery negative terminal for a while, reconnect it, and then read the fault code
- 2If 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.