VOLVO
CEM-B112F13 - Emergency brake lamp. General Electrical Failures. Circuit open
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
1 modelS80 (2007–)
Show models by year and engine (1)
What does this fault code mean?
The CEM powers the emergency brake light directly from an output. The code is stored when the supply cable has a break, and a message then appears in the text window.
Possible causes
- Break in the supply 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 that the supply cable is not broken, for example by checking continuity between two contact points
- 4Look for chafing and pinch damage on the cable to the emergency brake light
- 5If the fault returns, have a workshop with diagnostic equipment check the wiring and the control module output
Symptoms you may notice1
- A message appears in the text window
What the fault can affect2
- After 100 driving cycles with the fault, the function switches off permanently
- Clearing the fault codes resets the output
General guidance for car owners. Diagnosis on the car can point to a different cause.