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U2107 Buick Code - Lost Communication With Body Control Module

Quick Answer

The U2107 Buick code indicates that there is a communication problem between the Engine Control Module (ECM) and the Body Control Module (BCM) in the vehicle. Common causes include Faulty wiring or connectors, Malfunctioning BCM, Issues with the ECM. 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 Buick indicates Lost Communication With Body Control Module.
Common causes
Common causes include Faulty wiring or connectors, Malfunctioning BCM, Issues with the ECM.
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 14, 2024
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Code U2107 Buick Description

The U2107 Buick code indicates that there is a communication problem between the Engine Control Module (ECM) and the Body Control Module (BCM) in the vehicle. The BCM is responsible for controlling various body functions such as interior lighting, power windows, door locks, and other convenience features. When communication is lost between the ECM and BCM, it can lead to issues with the proper functioning of these systems.

OBDII Code U2107 Buick - Lost Communication With Body Control Module
U2107 Buick Code - Lost Communication With Body Control Module

Common Causes of U2107 Buick

  1. Faulty wiring or connectors
  2. Malfunctioning BCM
  3. Issues with the ECM
  4. Corrosion in the electrical connections
  5. Software glitches in the control modules

Symptoms of U2107 Buick

  1. Interior lights not working properly
  2. Power windows or door locks malfunctioning
  3. No-start condition
  4. Warning lights illuminated on the dashboard
  5. Inconsistent behavior of body control functions

How to Fix U2107 Buick

  1. Perform a thorough inspection of the wiring and connectors between the ECM and BCM.
  2. Check for any signs of corrosion or damage in the electrical connections.
  3. Test the BCM and ECM for proper functionality and communication.
  4. Clear the diagnostic trouble codes and retest the vehicle to ensure the issue has been resolved.
  5. If necessary, replace the faulty BCM or ECM and reprogram them to communicate correctly.

Cost to Fix U2107 Buick

The typical repair costs for addressing the U2107 Buick code can vary depending on the specific cause of the communication error. In general, the cost of parts such as a new BCM or ECM can range from $200 to $600, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue may fall between $300 and $900. It's important to note that these are rough estimates, and actual costs may vary based on the location, vehicle make and model, and labor rates at the auto repair shop. It's recommended to obtain a detailed quote from a trusted mechanic to get a more accurate cost estimate for the repair.

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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 U2107 Buick Code

1. What does the OBDII code U2107 mean for a Buick?

The U2107 code indicates a loss of communication with the Body Control Module (BCM), meaning the BCM is not sending or receiving data properly on the vehicle's communication network.

2. What are the common symptoms of the U2107 code in a Buick?

Symptoms may include dashboard warning lights, issues with power windows or locks, failure of interior lights, or intermittent functionality of electronic systems.

3. What causes the U2107 code to appear?

Common causes include a faulty Body Control Module, damaged wiring or connectors, network communication issues, or a low vehicle battery.

4. Can a weak battery cause the U2107 code in a Buick?

Yes, a weak or failing battery can disrupt the communication network and trigger the U2107 code.

5. How do you diagnose the U2107 code on a Buick?

Diagnosis involves scanning for additional codes, inspecting BCM wiring and connectors, testing the battery and charging system, and checking for proper network communication.

6. Can you drive a Buick with the U2107 code?

Driving may be possible, but the vehicle's electronic systems could malfunction, potentially leading to safety concerns. It’s best to address the issue promptly.

7. How do you fix the U2107 code on a Buick?

Repairs may include replacing or reprogramming the BCM, repairing damaged wiring, cleaning or reconnecting corroded connectors, or replacing a faulty battery.

8. Does the U2107 code require BCM replacement?

Not always. The issue could be related to wiring, connectors, or other components. Proper diagnosis is crucial before replacing the BCM.

9. How much does it cost to fix the U2107 code on a Buick?

Costs vary depending on the cause. BCM replacement and programming can range from $300 to $1,000, while addressing wiring issues may be less expensive.

10. Can updating the BCM software resolve the U2107 code?

In some cases, a software update or reprogramming can resolve the code if the issue is related to outdated or corrupted software.

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