VOLVO
CEM-B10D911 - Front Position Light. 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?
On cars with xenon dipped beams, the CEM powers both front position lights through a common output. The code is stored when the signal from the output is too low. One cause can be the supply cable being short-circuited to ground. The side marker or position lights then do not work, and a yellow warning symbol with a message may appear.
Possible causes
- The supply cable for the position lights is short-circuited to ground
What you can do
- 1Check that the relevant fuses are intact. Their locations are in the owner's manual or on the fuse box cover
- 2Check that the lamps are secure and that the connectors in the lamp housings are clean and dry
- 3Look for chafing on the supply cable, especially where it may rest against the body
- 4Use a multimeter to check that the supply cable to the position lights has no contact with ground (the body)
- 5If you have a diagnostic tool: activate the position lights and check that both lamps light
- 6If the fault returns, have a workshop with diagnostic equipment check the control module output and the wiring
Symptoms you may notice3
- Side marker lights or position lights do not work
- Yellow warning symbol and text message in the display
- The bulb failure warning in the instruments comes on or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.