AutoCodes – Generic – U0112

U0112 Code - Lost Communication With Battery Energy Control Module 'B'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Battery Energy Control Module 'B', Battery Energy Control Module 'B' harness is open or shorted, Battery Energy Control Module 'B' circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0112 indicates Lost Communication With Battery Energy Control Module 'B'.
Common causes: Common causes include Faulty Battery Energy Control Module 'B', Battery Energy Control Module 'B' harness is open or shorted, Battery Energy Control Module 'B' circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 11,314

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0112 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Battery Energy Control Module 'B' has not been received.

OBDII Code U0112 - Lost Communication With Battery Energy Control Module 'B' - AutoCodes.com — U0112 Code - Lost Communication With Battery Energy Control Module 'B'

What does this mean?

What are the Possible Causes of the DTC U0112?

Faulty Battery Energy Control Module 'B'
Battery Energy Control Module 'B' harness is open or shorted
Battery Energy Control Module 'B' circuit poor electrical connection

How to Fix the DTC U0112?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0112 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U0112 code?

Need more information on how to fix the U0112 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0112 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0112 BMW — Lost Communication With Battery Energy Control Module
U0112 Buick — Lost Communication With Battery Energy Control Module
U0112 Cadillac — Lost Communication With Battery Energy Control Module
U0112 Chevrolet — Lost Communication With Battery Energy Control Module
U0112 GMC — Lost Communication With Battery Energy Control Module

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0112 Code

1. What are the common symptoms of OBDII code U0112?

When U0112 is triggered, common symptoms may include loss of communication with the battery energy control module, warning lights on the dashboard, and potential issues with the vehicle's hybrid or electric powertrain system.

2. What can cause the OBDII code U0112 to appear?

The U0112 code is typically caused by a communication failure between the powertrain control module (PCM) and the battery energy control module 'B'. This can be due to wiring issues, damaged connectors, or a faulty control module.

3. How serious is the U0112 code?

The U0112 code should be addressed promptly, as it indicates a communication problem between critical modules in the vehicle. Ignoring this code can lead to performance issues, reduced fuel efficiency, and potential safety concerns.

4. Can I still drive my vehicle with the U0112 code?

It is not recommended to drive the vehicle when the U0112 code is present, as it can affect the proper functioning of the hybrid or electric powertrain system. It's best to have the issue diagnosed and repaired before continuing to drive.

5. How can I diagnose the U0112 code?

Diagnosing the U0112 code typically involves using a professional OBDII scanner to retrieve the trouble codes, checking the wiring and connectors for damage, and testing the battery energy control module 'B' for proper functionality.

6. What are some repair tips for fixing the U0112 code?

Repairing the U0112 code may involve repairing or replacing damaged wiring, connectors, or components related to the battery energy control module 'B'. It's important to follow the manufacturer's diagnostic and repair procedures for an effective fix.

7. Can I reset the U0112 code on my own?

While you can clear the U0112 code with an OBDII scanner, it is recommended to address the underlying issue causing the code to prevent it from reoccurring. Simply clearing the code without fixing the problem may result in further issues.

8. How much does it cost to repair the U0112 code?

The cost of repairing the U0112 code can vary depending on the extent of the issue, the specific repairs needed, and labor costs. It's best to consult with a professional mechanic or dealership for an accurate estimate.

9. Is the U0112 code common in specific vehicle makes and models?

The U0112 code can be found in various hybrid or electric vehicles that use a battery energy control module 'B'. It is not limited to a specific make or model, but it is more common in vehicles with hybrid or electric powertrains.

10. Can a DIY enthusiast fix the U0112 code?

While some DIY enthusiasts may have the skills to diagnose and repair the U0112 code, it is a complex issue related to the vehicle's powertrain system. It is recommended to seek assistance from a professional mechanic or dealership for proper diagnosis and repair.