VOLVO
CEM-U001800 - Medium Speed CAN Communication Bus (-) shorted to Bus (+). General Failure Information. No sub type information
System
Sentral elektronikk (CEM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerV40 (2013–), V40 Cross Country (2013–)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
The fault code means that the two wires in the medium-speed CAN bus are short-circuited to each other. The control modules in the car then cannot send their messages as normal, and communication on the network breaks down or is seriously disturbed. Functions linked to the bus, such as instruments, central locking and climate control, may stop working.
Mulige årsaker
- Chafed or pinched wiring lets the two MS-CAN wires touch each other
Hva du kan gjøre
- 1Read and clear the fault codes in all control modules, road test the car and note whether the code comes back
- 2Switch the ignition off and inspect the MS-CAN wiring for chafing and pinch damage, especially where the wires lie close together
- 3With the battery negative lead disconnected, use a multimeter to check the two wires for contact with each other. Twist the harness during the test
- 4If the code returns, have a workshop with diagnostic equipment check the bus. Replace the CEM only if testing shows it is faulty
Symptomer du kan merke4
- Instrument or button lighting does not work
- Gauges in the instrument panel do not work properly
- Central locking cannot lock or unlock the car
- Temperature control and air conditioning do not work
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