VOLVO
DIM-U025200 - Lost Communication With Trailer Module (TRM). General Failure Information. No sub type information
System
Driver Information Module (DIM)
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 instrument cluster (DIM) gets no reply from the trailer module (TRM), which among other things controls the trailer functions. The communication is broken, so the instrument cluster may show a text message about the trailer functions.
Possible causes
- Break in the communication wire
- The communication wire is shorted to earth
- The communication wire is shorted to supply voltage
- Poor contact, oxidation or breaks in the connections
What you can do
- 1Check that the fuses for the tow bar and the instrument cluster are intact. Their location is in the owner's manual
- 2Check that the trailer socket on the tow bar is not dirty, damp or corroded, and that the plug is fully seated in it
- 3Read and note the fault code with a diagnostic tool, clear it and road test the car with and without a trailer attached
- 4If the tow bar has recently been fitted or replaced, check that all connectors are properly reconnected
- 5If the fault remains, have a workshop with diagnostic equipment investigate the tow bar module and the communication
Symptoms you may notice1
- A text message and a warning symbol appear in the instrument cluster
General guidance for car owners. Diagnosis on the car can point to a different cause.