VOLVO
TRM-U001088 - Medium Speed CAN Communication Bus. Bus Signal / Message Failures. Bus off
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 switched itself off the MS-CAN, known as bus-off, after communication on the bus was disturbed. The cause may be a short circuit or break in the CAN wires, an internal fault in another control module on the same part of the network, or a fault in the tow hitch control module itself.
Possible causes
- Short circuit between the CAN wires
- Open circuit in one of the CAN wires
- Internal fault in another control module on the same part of the CAN network
- Damaged tow hitch control module (TRM)
What you can do
- 1Read the fault codes in the other control modules and deal with them first
- 2Check the connectors and wiring in the MS-CAN network for looseness, corrosion and damage
- 3Have a workshop measure the resistance of the MS-CAN network and find where the disturbance comes from
- 4Clear the code only once the fault has been fixed, and check that it does not return
Symptoms you may notice1
- Trailer lighting does not work
What the fault can affect3
- The control module shuts itself off from the bus (bus-off)
- The control module stays inactive until its power is cut
- The control module tries to communicate again when the power is switched back on
General guidance for car owners. Diagnosis on the car can point to a different cause.