AutoCodes – Generic – U2108

U2108 Code - Lost Communication With Electronic Brake 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 Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake 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: U2108 indicates Lost Communication With Electronic Brake Control Module.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake 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 8,883

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 U2108 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 U2108 - Lost Communication With Electronic Brake Control Module - AutoCodes.com — U2108 Code - Lost Communication With Electronic Brake Control Module

What does this mean?

What are the Possible Causes of the DTC U2108?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection

How to Fix the DTC U2108?

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 U2108 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 U2108 code?

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Need Help with the Code?

Get the U2108 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2108 Buick — Lost Communication With Electronic Brake Control Module
U2108 Cadillac — Lost Communication With Electronic Brake Control Module
U2108 Chevrolet — Lost Communication With Electronic Brake Control Module
U2108 Ford — Lost Communication With Adaptive Cruise Control Module
U2108 GMC — Lost Communication With Electronic Brake Control Module
U2108 Lincoln — Lost Communication With Adaptive Cruise Control Module
U2108 Mercury — Lost Communication With Adaptive Cruise 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 U2108 Code

1. What are the common symptoms of OBDII code U2108 (Lost Communication With Electronic Brake Control Module)?

- Common symptoms include the ABS warning light illuminated on the dashboard, loss of ABS functionality, and potential issues with the stability control system.

2. What are some possible causes of OBDII code U2108?

- Possible causes include faulty wiring or connectors between the electronic brake control module and the vehicle's main computer, a malfunctioning electronic brake control module, or a communication network issue.

3. How can I diagnose OBDII code U2108?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the trouble codes, checking the wiring and connectors for any visible damage, and testing the electronic brake control module for proper functionality.

4. Can OBDII code U2108 be fixed without professional help?

- While some simple issues like loose connectors or damaged wiring can be fixed by DIY enthusiasts, diagnosing and repairing more complex problems with the electronic brake control module may require professional help.

5. What are some repair tips for fixing OBDII code U2108?

- Repair tips may include checking and repairing any damaged wiring or connectors, ensuring proper grounding for the electronic brake control module, and performing a software update if recommended by the manufacturer.

6. Is it safe to drive with OBDII code U2108 present?

- It is not recommended to drive with this code present, as it may affect the proper functioning of the ABS system and compromise vehicle safety. It's advisable to address the issue promptly.

7. How much does it typically cost to repair OBDII code U2108?

- Repair costs can vary depending on the root cause of the issue and whether professional labor is required. Costs may range from a simple connector repair to a more complex electronic brake control module replacement.

8. Can a low battery cause OBDII code U2108 to appear?

- A low battery voltage can sometimes disrupt the communication network between modules in the vehicle, potentially triggering code U2108. It's advisable to ensure the battery is in good condition during diagnosis.

9. Will resetting the OBDII code U2108 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the communication problem persists, the code is likely to reappear. It's important to diagnose and address the root cause.

10. Is OBDII code U2108 a common issue in specific vehicle makes and models?

- This code can occur in various vehicle makes and models that use electronic brake control modules and communication networks. However, the prevalence may vary depending on the vehicle's age and design.