VOLVO
BECM-C105800 - Hybrid/EV Battery Voltage System Isolation Fault Level 3. 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 BECM checks the insulation of the high voltage system continuously and has found an insulation fault at level 3. The fault may be in the manual service disconnect, in the high voltage cables, or in one of the connected high voltage modules, such as the charger or the DC/DC converter.
Possible causes
- The manual service disconnect (MSD) or its base is damaged
- The high voltage cable is damaged
- The Inverter System Controller (ISC) is damaged
- The Air Conditioning Compressor Module (ACCM) is damaged
- The on-board charger (OBC) or the DC/DC converter (DCDC) is damaged
- 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 check visible damage to the high voltage cable sheathing, such as chafing or heat marks
- 3Has the car recently been to a workshop or had work done on the high voltage parts?
- 4Have a workshop check the service disconnect, the high voltage cables and the insulation
- 5The 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 notice5
- Red warning symbol and message in the display
- Charging of the high voltage battery stops or works poorly, especially while driving
- Drive modes PURE, SAVE and AWD disengage automatically or cannot be selected
- The combustion engine runs more often than normal in HYBRID mode
- Low voltage in the battery or a dead battery
What the fault can affect3
- Electric propulsion is not possible
- The high voltage battery cannot be charged
- An extended insulation test is performed at the next start
General guidance for car owners. Diagnosis on the car can point to a different cause.