VOLVO
TRM-8D05 - Stop lamps. Faulty signal
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 repeatedly found that the right-hand stop light signal and the braking message on the CAN network do not line up in time. The fault lies first and foremost in the wire to the right-hand rear light, where an open circuit is suspected.
Possible causes
- The right-hand stop light signal and the braking message on the CAN network do not line up in time
What you can do
- 1If the fault code TRM-E001 is also stored, troubleshoot it first
- 2Remove any trailer connector from the socket before troubleshooting
- 3Use a multimeter to check that the wire between the tow hitch control module and the car's right-hand rear light has no open circuit
- 4Check the connectors at the right-hand rear light for looseness, corrosion and damage
Symptoms you may notice3
- The trailer's stop lamps do not work correctly
- Information lamp lit
- Message in the text display
General guidance for car owners. Diagnosis on the car can point to a different cause.