U0111
Lost Communication with Battery Energy Control Module A
2012-2017 Buick Regal 2.4L I4 Hybrid
Critical SeverityNetworkGeneric (SAE)
Description
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.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0111 on Other Vehicles
Common Questions
What does code U0111 mean on a 2012-2017 Buick Regal?
U0111 stands for "Lost Communication with Battery Energy Control Module A". Cannot communicate with the hybrid/EV high-voltage battery management system.
What are the symptoms of U0111 on a Buick Regal?
Common symptoms of U0111 include: Hybrid battery warning, Check hybrid system light, Reduced EV range, Vehicle may not start, Battery temperature warning.
What causes U0111 on a 2012-2017 Buick Regal?
Common causes of U0111 include: Battery management module failure, CAN bus wiring, 12V supply loss to module, High-voltage safety disconnect, Module connector issue.