AutoCodes – Saturn – U2106 Saturn

U2106 Saturn 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 Saturn 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 3,962

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

What does this mean?

What are the Possible Causes of the DTC U2106 Saturn?

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 Saturn?

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 Saturn 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 Saturn Code

1. What are common symptoms of the U2106 OBDII code in a Saturn related to Lost Communications With Transmission Control Module?

- Common symptoms include transmission shifting issues, loss of power, and illuminated warning lights on the dashboard.

2. What are the possible causes of the U2106 code in a Saturn?

- The U2106 code can be triggered by issues such as a faulty transmission control module, damaged wiring or connectors, or a software communication error.

3. How can I diagnose the U2106 code in my Saturn?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, inspecting the wiring and connectors, and testing the transmission control module.

4. Is it safe to continue driving with the U2106 code in my Saturn?

- It is not recommended to drive with the U2106 code present, as it can lead to further transmission damage or safety issues. It is best to address the issue promptly.

5. How can I repair the U2106 code in my Saturn?

- Repair options may include repairing or replacing damaged wiring or connectors, reprogramming the transmission control module, or replacing the transmission control module altogether.

6. Can the U2106 code be triggered by other issues besides the transmission control module?

- Yes, other issues such as a faulty powertrain control module, CAN bus communication errors, or a malfunctioning sensor can also trigger the U2106 code.

7. Will resetting the trouble codes make the U2106 code go away permanently?

- Resetting the trouble codes may temporarily clear the U2106 code, but if the underlying issue is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair the U2106 code in a Saturn?

- The cost of repairing the U2106 code can vary depending on the specific issue, but it may range from $200 to $800 or more, including parts and labor.

9. Can I fix the U2106 code in my Saturn myself, or do I need to take it to a professional mechanic?

- While some simple repairs like checking and cleaning connectors can be done by DIY enthusiasts, diagnosing and repairing complex issues related to the U2106 code may require professional expertise.

10. How long does it take to repair the U2106 code in a Saturn?

- The repair time for the U2106 code can vary based on the specific issue and the expertise of the mechanic, but it may take anywhere from a few hours to a full day to complete the repairs.