VOLVO
BECM-P0B3700 - High Voltage Manual Service Disconnect MSD Open. 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?
Both high voltage circuits have their own safety circuit, known as an interlock. It also keeps an eye on the high voltage battery voltage. The code is set when the manual service disconnect (MSD) is open, which may be due to a loose, missing or damaged unit.
Possible causes
- The manual service disconnect (MSD) sits loose or is unplugged
- The manual service disconnect (MSD) is damaged
- The base for the manual service disconnect (MSD) 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 check visible damage to the high voltage cable sheathing, such as chafing or pinch marks
- 3Have a workshop check that the manual service disconnect is fully in place and undamaged
- 4The 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
- Charging of the high voltage battery stops or works poorly
- Drive modes PURE, SAVE and AWD disengage automatically or cannot be selected
- The combustion engine runs more often than normal in HYBRID mode
What the fault can affect2
- The high voltage battery cannot be charged
- Electric propulsion is not possible
General guidance for car owners. Diagnosis on the car can point to a different cause.