U0119critical severityNetwork
Lost Communication with Battery Energy Control Module B
on 2010 Toyota Highlander 3.3L V6 Hybrid · AWD
What this code means
Cannot communicate with the secondary battery energy module in multi-battery hybrid systems.
Symptoms
- Hybrid system warning
- Reduced battery capacity
- Limited EV operation
- Battery imbalance warnings
Common causes
- Battery module B failure
- CAN bus wiring
- 12V supply issue
- Module connector fault
Diagnostic steps
- Check module B fuse
- Test 12V power and ground
- Check CAN wiring
- Scan battery management system
- Check module B connector
Repair notes
High-voltage system. Professional service required.
Other Network codes on this 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
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus