U0111critical severityNetwork
Lost Communication with Battery Energy Control Module A
on 2020 BMW i3 Range Extender · RWD
What this code means
Cannot communicate with the hybrid/EV high-voltage battery management system.
Symptoms
- Hybrid battery warning
- Check hybrid system light
- Reduced EV range
- Vehicle may not start
- Battery temperature warning
Common causes
- Battery management module failure
- CAN bus wiring
- 12V supply loss to module
- High-voltage safety disconnect
- Module connector issue
Diagnostic steps
- Check battery management module 12V fuse
- Test 12V power and ground
- Verify HV safety interlock
- Check CAN wiring to module
- Scan for battery system codes
Repair notes
High-voltage system. Qualified technician required. Check 12V auxiliary supply first.
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Other Network codes on this vehicle
CC-ID-181
System Check Failed
CC-ID-207
Central Electronics Failure, Stop Vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High