VOLVO
TRM-E010 - Power supply. Voltage difference too great
System
Trailer Module (TRM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
The tow hitch control module (TRM) has a battery voltage that differs sharply from the voltage reported by the central electronic module (CEM). The code is only worth acting on if it has been active for a long time and the car has functions that are not working. Otherwise it can be cleared.
Possible causes
- Power supply to the tow hitch control module is short-circuited to ground
- Contact resistance or corrosion in the connections
- Faulty alternator
- Faulty battery
What you can do
- 1If the code has been active only briefly and no functions are failing, clear it without further action
- 2Check that the relevant fuses are intact and that the battery terminals are tight
- 3Check that the battery is charging while driving, and that the car's charging system works properly
- 4Check the connectors and wiring to the tow hitch control module for contact resistance and corrosion
Symptoms you may notice1
- Trailer lighting does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.