VOLVO
CEM-B112F01 - Emergency brake lamp. General Failure Information. General electrical failure
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 straight from an output. The code is stored when the supply cable has a break or is shorted to ground. The brake lights then do not light when the pedal is pressed, and a message may appear in the text window.
Possible causes
- The supply cable is short-circuited to ground
- 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
- 3Look for chafing and pinch damage on the supply cable to the emergency brake light
- 4Use a multimeter to check that the supply cable has no contact with ground (the body) and is not broken
- 5If the fault returns, have a workshop with diagnostic equipment check the wiring and the control module output
Symptoms you may notice2
- Brake lights do not light when the brake pedal is pressed
- A message appears in the text window
General guidance for car owners. Diagnosis on the car can point to a different cause.