VOLVO
CEM-B10B509 - Daytime Running Light Right. General Failure Information. Component Failures
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 central electronic module (CEM) monitors how much current the daytime running lights draw. The fault shows that the current in the right daytime running light circuit is lower than expected, which is read as a fault in the lamp itself.
Possible causes
- The right-hand daytime running light is damaged
What you can do
- 1Read off and note the code, clear it and check whether it returns when the daytime running lights are on
- 2Check whether the right daytime running light comes on, and compare it with the left one
- 3Replace the bulb in the right daytime running light if it is broken
- 4Check that the fuse for the daytime running lights is intact and that the lamp connector is fully engaged and not corroded
- 5If the fault remains, have a workshop check the right daytime running light and its wiring
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.