What does fault code TRM-U300913 mean?

Diagnostic fault code details for TRM-U300913 (Volvo S60 (2011–), Volvo S80 (2007–), Volvo V40 (2013–)). Repair service at OBD Tuning.

VOLVO

TRM-U300913 - Control Module Ground "B". General Electrical Failures. Circuit open

System

Trailer Module (TRM)

Volvo models this fault code applies to

Applies to the following models:

9 models

S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)

Show models by year and engine (9)

What does this fault code mean?

The tow hitch control module (TRM) has registered an open circuit on ground connection B. 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

1Look for visible damage to the wiring to ground connection B
2Check the connector for damage and looseness
3Replace the wire if it is broken or damaged
4If the fault remains after these checks, 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.