AutoCodes – Chevrolet – U2106 Chevrolet

U2106 Chevrolet 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 Chevrolet 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 11,074

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2106 Chevrolet 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 Chevrolet - Lost Communications With Transmission Control Module - AutoCodes.com — U2106 Chevrolet Code - Lost Communications With Transmission Control Module

What does this mean?

What are the Possible Causes of the DTC U2106 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What are the common symptoms of OBDII code U2106 in a Chevrolet related to lost communications with the Transmission Control Module?

- Common symptoms include issues with shifting gears, poor performance, and warning lights on the dashboard.

2. What are some possible causes of the U2106 code in a Chevrolet indicating a communication problem with the Transmission Control Module?

- Causes can include faulty wiring or connectors, a malfunctioning Transmission Control Module, or a communication network issue.

3. How can I diagnose the U2106 code in a Chevrolet myself?

- You can start by checking the wiring and connectors for any visible damage, ensuring proper connections, and using a diagnostic tool to scan for specific communication errors.

4. Can a U2106 code be cleared and reset without fixing the underlying issue?

- While you can clear the code temporarily, it is essential to address the root cause to prevent the issue from recurring.

5. Is it safe to drive my Chevrolet with the U2106 code triggered?

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

6. What are some repair tips for fixing the U2106 code in a Chevrolet?

- Repair tips may include inspecting and repairing damaged wiring, checking and resetting connectors, or replacing the Transmission Control Module if necessary.

7. Can a DIY enthusiast fix the U2106 code issue in a Chevrolet, or is professional help required?

- Depending on your knowledge and experience with automotive repairs, you may be able to address simpler causes of the U2106 code. However, complex issues may require professional assistance.

8. How much does it typically cost to repair the U2106 code in a Chevrolet at a dealership or auto repair shop?

- Repair costs can vary based on the specific cause of the code, but expect to pay for diagnostic time, parts replacement, and labor fees, which can range from a few hundred to over a thousand dollars.

9. Are there any recalls or service bulletins related to the U2106 code in Chevrolet vehicles?

- It's recommended to check with Chevrolet dealerships or online resources for any relevant recalls or service bulletins that may address the U2106 code issue.

10. How can I prevent the U2106 code from appearing in my Chevrolet in the future?

- Regular vehicle maintenance, checking for loose connections, and promptly addressing any warning signs can help prevent the U2106 code from reoccurring.