AutoCodes – Cadillac – U2106 Cadillac

U2106 Cadillac 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 Cadillac 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 1,551

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

What does this mean?

What are the Possible Causes of the DTC U2106 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code U2106 Cadillac (Lost Communications With Transmission Control Module)?

- Common symptoms include the check engine light coming on, transmission shifting problems, and possible loss of communication with the transmission module.

2. What are some possible causes of OBDII code U2106 Cadillac?

- Possible causes include a faulty transmission control module, damaged wiring or connectors, low battery voltage, or a software issue.

3. How can I diagnose OBDII code U2106 Cadillac?

- Diagnosing this code typically involves using a scan tool to retrieve the fault codes, checking the transmission control module for communication issues, and inspecting the wiring and connectors for any damage.

4. Can I still drive my Cadillac with OBDII code U2106 present?

- It is not recommended to drive your Cadillac with this code present, as it can lead to transmission issues and potential safety hazards. It's best to have the issue diagnosed and repaired promptly.

5. How can I repair OBDII code U2106 Cadillac?

- Repair options may include replacing the transmission control module, repairing or replacing damaged wiring or connectors, ensuring proper battery voltage, and performing any necessary software updates.

6. Is it possible to reset OBDII code U2106 Cadillac without repairs?

- While clearing the fault code may temporarily turn off the check engine light, the underlying issue causing the code will likely persist. It's important to address the root cause of the problem to prevent further issues.

7. Can a DIYer fix OBDII code U2106 Cadillac?

- Depending on your experience and access to tools, a DIYer may be able to diagnose and repair this code. However, due to the complexity of transmission control systems, it is recommended to seek professional help for accurate diagnosis and repair.

8. How much does it cost to repair OBDII code U2106 Cadillac?

- Repair costs can vary depending on the specific cause of the issue, parts needed, labor rates, and location. It is advisable to get a diagnostic from a trusted mechanic to determine the exact cost of repairs.

9. Will OBDII code U2106 Cadillac affect the performance of my vehicle?

- Yes, this code can affect the performance of your Cadillac, especially in terms of transmission operation. Addressing the issue promptly can help prevent further damage and ensure optimal vehicle performance.

10. How common is OBDII code U2106 Cadillac in vehicles?

- OBDII code U2106 Cadillac (Lost Communications With Transmission Control Module) is a relatively common issue in vehicles equipped with OBDII systems, particularly in Cadillac models with transmission control module communication problems.