U0112
Lost Communication with Battery Energy Control Module \"B\"
The Battery Energy Control Module "B" has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. The second battery-energy controller is silent, limiting high-voltage system availability. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
The Battery Energy Control Module "B" has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. The second battery-energy controller is silent, limiting high-voltage system availability. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Common causes
- high
BEM-B unpowered
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-3300
- medium
CAN wiring to BEM-B broken
A plausible cause — test and verify before replacing parts.
Typical part cost: $220-3300
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
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Frequently asked questions
What does U0112 mean?
U0112 means "Lost Communication with Battery Energy Control Module \"B\"". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U0112?
bem-b unpowered; can wiring to bem-b broken; gateway module routing can messages incorrectly — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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