VOLVO
TRM-U300813 - Control Module Ground "A". General Electrical Failures. Circuit open
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 registered an open circuit on ground connection A, meaning a break. The fault lies in the wiring or the connector, and the trailer lighting may stop working.
Possible causes
- Break in the wiring
- Damaged connector
What you can do
- 1Check the connector at the tow hitch control module for damage and corrosion
- 2Look for damage to the wire between ground connection A and the module
- 3If a wire is broken or damaged, replace it
- 4If no fault is found in the wiring, have a workshop replace the tow hitch control module
Symptoms you may notice1
- Trailer lighting does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.