VOLVO
BECM-U007400 - Control module communication bus "B" Off. General Failure Information. No sub type information
System
Battery Energy Control Module (BECM)
Volvo models this fault code applies to
Applies to the following models:
1 modelV60 (2011–)
Show models by year and engine (2)
What does this fault code mean?
The control module has found an internal fault in itself or in its link to any of the module controllers for cells A to J. The fault may be caused by a damaged battery.
Possible causes
- The high voltage battery is damaged
What you can do
- 1Read and note the fault code, clear it and road test to check whether it returns
- 2Have a workshop with diagnostic equipment check communication with the battery modules
- 3The high voltage system should only be handled by qualified personnel, so have a workshop carry out all work on the battery and other high voltage parts
Symptoms you may notice4
- Red warning symbol and message in the display
- Drive modes PURE, SAVE and AWD disengage automatically or cannot be selected
- The combustion engine runs more often than normal in HYBRID mode
- Charging of the high voltage battery stops or works poorly
What the fault can affect1
- Electric propulsion is not possible
General guidance for car owners. Diagnosis on the car can point to a different cause.