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Engine-Codes – Generic – U2108

U2108 Code - Lost Communication With Electronic Brake Control Module

Quick Answer

The U2108 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has lost communication with the electronic brake control module (EBCM). Common causes include Corroded or damaged wiring harnesses, Loose or faulty connectors, Malfunctioning ECM or EBCM. 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 Corroded or damaged wiring harnesses, Loose or faulty connectors, Malfunctioning ECM or EBCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code U2108 Description

The U2108 diagnostic trouble code (DTC) indicates that the vehicle's engine control module (ECM) has lost communication with the electronic brake control module (EBCM). This means that there is a communication failure between the two modules, which can lead to issues with the vehicle's braking system. The EBCM is responsible for controlling the vehicle's anti-lock braking system (ABS) and traction control system, so when communication is lost, it can affect the vehicle's performance and safety.

OBDII Code U2108 - Lost Communication With Electronic Brake Control Module
U2108 Code - Lost Communication With Electronic Brake Control Module

Common Causes of U2108

  1. Corroded or damaged wiring harnesses
  2. Loose or faulty connectors
  3. Malfunctioning ECM or EBCM
  4. Software glitches or outdated firmware
  5. Electrical interference from other components

Symptoms of U2108

  1. ABS warning light illuminated on the dashboard
  2. Traction control system disabled
  3. Loss of ABS functionality
  4. Erratic braking behavior
  5. Reduced stability and control during braking

How to Fix U2108

  1. Perform a visual inspection of the wiring harnesses and connectors for any signs of damage or corrosion. Repair or replace any faulty components.
  2. Check and reset the communication protocols between the ECM and EBCM using a diagnostic scan tool. Update the software if necessary.
  3. Test the ECM and EBCM for proper functionality and communication by performing a system scan and checking for any stored trouble codes.
  4. Clear the U2108 code from the ECM memory and test drive the vehicle to verify that the ABS and traction control systems are operating correctly.
  5. If the issue persists, consult a professional mechanic or dealership for further diagnosis and potential module replacement.

Cost to Fix U2108

The typical repair costs for addressing the U2108 code can vary depending on the specific cause of the communication failure and the labor rates at the auto repair shop. In general, the cost of diagnosing and repairing this issue can range from $200 to $500, including parts and labor. However, the final cost may be higher if components such as control modules need to be replaced. It is advisable to consult with a trusted mechanic or dealership to get an accurate estimate based on the vehicle's make and model. Keep in mind that labor rates can vary between different locations and service providers, so it's essential to inquire about the specific rates in your area.

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Code U2108 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.

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