AutoCodes – Generic – U2107

U2107 Code - Lost Communication With Body Control Module

Quick Answer

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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: U2107 indicates Lost Communication With Body Control Module.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module 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 11,697

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 Jun 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2107 Description

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module. A module with a CAN serial data circuits malfunction or which loses power during the current ignition cycle will have a Loss of Communication Diagnostic Trouble Code (DTC) set by other modules that depend on information from that failed module. If any of the CAN circuit are shorted to battery voltage, ground, or between them no communication is possible on the CAN serial data bus, a Diagnostic Trouble Code will set.

OBDII Code U2107 - Lost Communication With Body Control Module - AutoCodes.com — U2107 Code - Lost Communication With Body Control Module

What does this mean?

What are the Possible Causes of the DTC U2107?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection

How to Fix the DTC U2107?

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 U2107 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 U2107 code?

Need more information on how to fix the U2107 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2107 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2107 Buick — Lost Communication With Body Control Module
U2107 Cadillac — Lost Communication With Body Control Module
U2107 Chevrolet — Lost Communication With Body Control Module
U2107 Ford — Collision Mitigation By Braking
U2107 GMC — Lost Communication With Body Control Module
U2107 Lincoln — Collision Mitigation By Braking
U2107 Mercury — Collision Mitigation By Braking
U2107 Saturn — Lost Communication With Body 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 U2107 Code

1. What are common symptoms of OBDII code U2107, Lost Communication With Body Control Module?

- Common symptoms include issues with interior and exterior lighting, power windows, door locks, or other body control functions.

2. What are the possible causes of OBDII code U2107?

- Possible causes include a faulty body control module, damaged wiring or connectors, low battery voltage, or a communication network issue.

3. How can I diagnose the cause of OBDII code U2107 at home?

- You can start by checking the body control module for any visible damage, inspecting the wiring and connectors for signs of wear or corrosion, and testing the battery voltage.

4. Can a DIY enthusiast repair OBDII code U2107?

- Depending on the cause, DIY repairs may be possible, such as replacing damaged wiring or connectors. However, complex issues with the body control module may require professional assistance.

5. Is it safe to continue driving with OBDII code U2107 present?

- It is generally not recommended to continue driving with this code present, as it may affect critical functions controlled by the body control module. Seek diagnosis and repairs promptly.

6. How much does it typically cost to repair OBDII code U2107?

- Repair costs can vary widely depending on the cause of the issue. Simple fixes like replacing wiring may cost less, while replacing the body control module can be more expensive.

7. Can a low battery voltage cause OBDII code U2107 to appear?

- Yes, low battery voltage can disrupt communication with the body control module and trigger the U2107 code. Ensure your vehicle's battery is in good condition.

8. Will resetting the OBDII system clear the U2107 code?

- Resetting the system may temporarily clear the code, but if the underlying issue is not resolved, the code is likely to reappear. It's important to diagnose and fix the root cause.

9. Can extreme temperatures affect the body control module and trigger code U2107?

- Yes, extreme temperatures can affect electronic components, including the body control module. It's important to keep your vehicle in a stable temperature environment.

10. How long does it take to repair OBDII code U2107?

- The repair time can vary based on the cause of the issue and the complexity of the repair. Simple fixes may take a short time, while more involved repairs could take longer.