VOLVO
ICM-6C78 - Traffic message channel module (TMC) not approved. Faulty signal
System
Infotainment Control Module (ICM)
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?
ICM checks the traffic message channel module (TMC) against the register of approved units in the CEM. If TMC is missing from the register, the module is blocked and traffic information stops being shown or updated. The code is set on detection, usually after a replacement where the software was not downloaded.
Possible causes
- A traffic message channel module the CEM register does not approve
- Software not downloaded when the traffic message channel module was replaced
- The software download failed or was incomplete
What you can do
- 1Clear the code and test-drive the car to see whether it returns
- 2If the TMC module was recently replaced, check that software was downloaded. The download is done by a workshop
- 3Check that the connectors to the TMC module are fully seated and not corroded
- 4If the fault remains after the software download, the module may need replacing. A workshop should do this
Symptoms you may notice1
- Traffic information is not shown or not updated
General guidance for car owners. Diagnosis on the car can point to a different cause.