AutoCodes – GMC – U2108 GMC

U2108 GMC 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 GMC 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 1,006

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

What does this mean?

What are the Possible Causes of the DTC U2108 GMC?

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 GMC?

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 GMC 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.

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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 GMC Code

1. What are common symptoms of OBDII code U2108 in a GMC vehicle?

- Common symptoms include the ABS light illuminating on the dashboard, loss of communication with the electronic brake control module, and possible traction control issues.

2. What can cause the OBDII code U2108 in a GMC, indicating lost communication with the electronic brake control module?

- The code can be triggered by a faulty electronic brake control module, damaged wiring or connectors, a blown fuse, or a problem with the vehicle's computer system.

3. How can I diagnose the cause of OBDII code U2108 in my GMC vehicle?

- Diagnosis typically involves checking the wiring and connectors leading to the electronic brake control module, inspecting the module itself, and using a scan tool to communicate with the affected systems.

4. Can a DIY enthusiast repair OBDII code U2108 in a GMC, or is professional assistance necessary?

- While some repairs, such as checking and cleaning connectors, can be done by DIY enthusiasts, diagnosing and repairing more complex issues with the electronic brake control module may require professional assistance.

5. What are some repair tips for resolving OBDII code U2108 in a GMC?

- Start by checking and cleaning the connectors and wiring related to the electronic brake control module. Ensure all fuses are in good condition. If the issue persists, seek professional help for further diagnosis and repair.

6. Is it safe to continue driving a GMC vehicle with OBDII code U2108 present?

- It is not recommended to drive the vehicle with this code present, as it may affect the operation of crucial safety systems like ABS and traction control. Addressing the issue promptly is important for road safety.

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

- The cost of repair can vary depending on the underlying cause. Simple fixes like cleaning connectors may be inexpensive, while replacing the electronic brake control module can be more costly. It's best to obtain quotes from professional mechanics.

8. Can a dead battery cause OBDII code U2108 to appear in a GMC?

- A dead or low battery voltage can sometimes lead to communication issues between modules in the vehicle, including the electronic brake control module. Ensuring the battery is fully charged and in good condition is a good first step in troubleshooting.

9. How long does it typically take to diagnose and repair OBDII code U2108 in a GMC?

- The time required for diagnosis and repair can vary based on the complexity of the issue. Simple fixes may take a couple of hours, while more involved repairs could take longer. It's best to consult with a mechanic for a more accurate estimate.

10. Are there any recalls or service bulletins related to OBDII code U2108 in GMC vehicles?

- It's recommended to check with a GMC dealership or online resources for any recalls or service bulletins related to OBDII code U2108 in specific models. Manufacturers may provide assistance for known issues.