VOLVO
CEM-B10A609 - Quiescent Current At Low Battery Voltage. 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?
Information about the vehicle's power supply is stored in the central electronic module (CEM) and in the battery monitoring sensor (BMS). The fault shows that the standby current is higher than normal when the battery voltage is low, and it is checked once an hour. The code alone does not indicate a fault in the CEM.
Possible causes
- One control module does not enter sleep mode
- One control module has an internal short circuit
- Leakage current in wiring or connectors somewhere in the car
What you can do
- 1Fully charge the battery and check that it holds its voltage
- 2Clear the code and check whether it returns after the car has been left locked overnight
- 3Check that the battery terminal clamps are tight and clean
- 4Remove extra equipment fitted afterwards and see whether the fault clears
- 5If the fault returns, have a workshop measure the standby current and find which control module or circuit draws too much
Symptoms you may notice4
- The battery loses charge while the car is parked
- The engine does not start or does not turn over
- The central locking does not work
- Text message about a low battery in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.