VOLVO
CEM-B132311 - Horn Switch. General Electrical Failures. Circuit short to ground
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
The CEM controls the horn, and the fault is stored when the horn switch is active for too long. The cause is that the switch has stuck in the active position.
Possible causes
- The horn switch has stuck in the active position
What you can do
- 1Check that the horn button returns when released and does not stick
- 2Press the horn and release it, check that it works as it should, then clear the fault code and road test
- 3If you have a diagnostic tool, check in live data that the horn switch reads off when it is not pressed
- 4Check that the connectors to the horn button are secure and free from moisture and corrosion
- 5If the fault returns, have a workshop with diagnostic equipment check the CEM and the horn wiring
Symptoms you may notice1
- The horn does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.