AutoCodes – Buick – U2107 Buick

U2107 Buick 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 Buick 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 671

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

What does this mean?

What are the Possible Causes of the DTC U2107 Buick?

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 Buick?

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 Buick 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 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. Itâ€™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.