Lost Communication With Battery Energy Control Module B
What does U0112 mean?
The U0112 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Battery Energy Control Module B. This is a critical severity code.
Common Symptoms
- Multiple warning lights on dashboard
- Hybrid or electric drive system inoperative
- Battery charging system malfunction
- Reduced engine power warning
- Vehicle may shut down unexpectedly
Probable Causes (Ranked by Likelihood)
- Failed battery energy control module B Very High
- Open circuit in CAN bus wiring to module B High
- Corroded battery module connector pins Moderate
- CAN bus network overload or interference Low
Step-by-Step Diagnostic Procedure
-
Scan all modules for DTCs -- look for related U-codes and battery codes
-
Check power and ground circuits to battery energy control module B
-
Inspect CAN bus wiring between modules A and B for damage
-
Verify CAN bus signal integrity with an oscilloscope at module B connector
Frequently Asked Questions
Can I drive with code U0112?
No. This code indicates a complete loss of communication with the secondary battery energy control module. The hybrid drive system may be inoperative, making the vehicle unsafe to drive.
What is the difference between U0111 and U0112?
U0111 refers to battery energy control module A (primary), while U0112 refers to module B (secondary). Some hybrid vehicles use two modules to manage the high-voltage battery system.
Is U0112 expensive to fix?
Repairs typically cost between $250 and $1500. Wiring and connector repairs are less expensive, but module replacement with reprogramming can be costly.