VOLVO
CEM-B111515 - High mounted stop lamp control. General Electrical Failures. Circuit short to battery or open
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 high mounted brake light is fed directly from an output on the CEM. The code is stored when the supply cable has a break or is shorted to supply voltage. The brake light then does not work at that height.
Possible causes
- A break or short to supply voltage in the cable
What you can do
- 1Check that the brake lights work by having someone watch them while you press the brake. Brake lights matter for road safety, so fix the fault promptly
- 2Check that the relevant fuses are intact. Their locations are in the owner's manual or on the fuse box cover
- 3Use a multimeter to check whether the supply cable has voltage when the brake is not pressed
- 4Use a multimeter to check that the cable is not broken, for example by checking continuity between two contact points
- 5If the fault returns, have a workshop with diagnostic equipment check the wiring and the control module output
Symptoms you may notice1
- Tail light or brake light does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.