What Does U0112 Mean?
The control module has lost communication with Battery Energy Control Module B on the vehicle network. In vehicles with dual battery management systems, this affects monitoring and control of the secondary battery system.
Safety Warning
Secondary battery management may fail, affecting vehicle operation. Hybrid/electric vehicles may not operate properly or could experience unexpected shutdowns.
Common Causes
35%
Faulty wiring or connectors between control modules
25%
Battery Energy Control Module B internal failure
20%
CAN network short to ground or voltage
15%
Insufficient power supply or ground fault
5%
Module programming or software corruption
Diagnostic Steps
1
Step 1: Verify system voltage at Battery Energy Control Module B connector (should be 12V or greater)
2
Step 2: Inspect all connectors and wiring to Module B for physical damage, water intrusion, or corrosion
3
Step 3: Attempt to communicate directly with Battery Energy Control Module B using advanced scan tool functions
4
Step 4: Test CAN High and CAN Low circuits for proper voltage levels and resistance values
5
Step 5: Check for software updates or reflash requirements; swap module if hardware failure is confirmed
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The control module has lost communication with Battery Energy Control Module B on the vehicle network. In vehicles with dual battery management systems, this affects monitoring and control of the secondary battery system.
The most common cause of U0112 (Lost Communication With Battery Energy Control Module "B") is: Faulty wiring or connectors between control modules
Typical repair costs for U0112 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Secondary battery management may fail, affecting vehicle operation. Hybrid/electric vehicles may not operate properly or could experience unexpected shutdowns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0112 to identify the root cause.
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Quick Info
Category
Network
System
Hybrid/Electric Battery Management
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
