VOLVO
CEM-B10B415 - Daytime Running Light Left. 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 CEM feeds the daytime running lights and watches the voltage on their wires. The fault shows that the supply to the left daytime running light is too high, or that the circuit is open. The fault is checked when the daytime running lights are not active.
Possible causes
- Short to battery on the voltage supply to the left daytime running light
- Break in the voltage supply to the left daytime running light
What you can do
- 1Clear the code and check whether it returns when the ignition is switched on
- 2Check that the fuse for the daytime running lights is intact
- 3Check that the connector to the left daytime running light is fully engaged and not corroded
- 4Use a multimeter (ignition off, connector unplugged) to check that the wire to the left daytime running light is not at battery voltage and has no break
- 5If the fault remains, have a workshop check the wiring to the left daytime running light
Symptoms you may notice3
- Yellow warning symbol and text message in the display
- The front fog lights or daytime running lights do not work
- 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.