VOLVO
CEM-U210929 - Back-up battery. General Signal Failures. Signal signal invalid
System
Sentral elektronikk (CEM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerV40 (2013–), V40 Cross Country (2013–)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
On the V40, the central electronic module (CEM) monitors the voltage from the back-up battery, a secondary battery. The fault is stored at ignition position II when the CEM receives a signal about the back-up battery that is not valid. The automatic engine start and stop function is then switched off.
Mulige årsaker
- Open circuit between the back-up battery and the engine compartment fuse box
- Damaged fuse for the back-up battery
- One of the two engine-bay fuses is damaged
Hva du kan gjøre
- 1Check the fuses in the engine compartment, especially the two that serve the back-up battery, and replace a blown fuse with a new one of the same rating
- 2Check that the connectors at the back-up battery and in the fuse box are tight and free from oxidation
- 3Use a multimeter to check that the cable from the back-up battery to the fuse box has no break
- 4If you have a diagnostic tool, follow the back-up battery voltage in live data and check that it sits close to the car's other battery voltage
- 5If the fault returns although the fuses and connectors are sound, have a workshop check the supply to the back-up battery
Symptomer du kan merke2
- The automatic engine start and stop function does not work while driving
- The automatic engine start and stop function does not work at idle
Hva feilen kan påvirke1
- The automatic engine start and stop function is switched off
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