AutoCodes – Buick – U2106 Buick

U2106 Buick Code - Lost Communications With Transmission 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 Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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: U2106 Buick indicates Lost Communications With Transmission Control Module.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module harness is open or shorted, Transmission 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 614

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 U2106 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 U2106 Buick - Lost Communications With Transmission Control Module - AutoCodes.com — U2106 Buick Code - Lost Communications With Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U2106 Buick?

Faulty Transmission Control Module (TCM)
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U2106 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 U2106 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 U2106 Buick Code

1. What does the OBDII code U2106 Buick mean?

- The code U2106 indicates a communication problem between the vehicle's control module and the transmission control module.

2. What are the common symptoms of U2106 Buick code?

- Common symptoms include transmission shifting issues, transmission warning lights on the dashboard, and possibly the vehicle going into limp mode.

3. What are some possible causes of the U2106 Buick trouble code?

- Possible causes include faulty wiring or connections, a malfunctioning transmission control module, a defective engine control module, or software issues.

4. How can I diagnose the U2106 Buick code?

- Diagnosing this code typically requires a professional scan tool to communicate with the vehicle's control modules and identify the source of the communication problem.

5. Can I still drive my vehicle with the U2106 code present?

- It is not recommended to drive the vehicle with the U2106 code present, as it can lead to further transmission issues and potential safety hazards.

6. How can I repair the U2106 Buick trouble code?

- Repairing the U2106 code involves addressing the underlying communication problem, which may include checking and repairing wiring, connectors, and modules involved in the communication network.

7. Is it possible to reset the U2106 code without fixing the issue?

- While clearing the code may temporarily turn off the warning light, the underlying problem causing the U2106 code will persist and likely trigger the code again.

8. Can a DIY enthusiast fix the U2106 Buick code?

- Fixing the U2106 code may require advanced diagnostic tools and expertise, so it is recommended to consult a professional mechanic for accurate diagnosis and repair.

9. Are there any preventive maintenance tips to avoid the U2106 code?

- Regularly checking and maintaining the vehicle's electrical system, including wiring and connectors, can help prevent communication issues that trigger the U2106 code.

10. Is the U2106 Buick code a common issue in certain Buick models?

- The U2106 code can occur in various Buick models, especially in vehicles equipped with complex electronic control systems.