AutoCodes – GMC – U2125 GMC

U2125 GMC Code - Lost Communication With Telematic Unit

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Telematic Unit, Telematic Unit harness is open or shorted, Telematic Unit 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: U2125 GMC indicates Lost Communication With Telematic Unit.
Common causes: Common causes include Faulty Telematic Unit, Telematic Unit harness is open or shorted, Telematic Unit 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 782

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 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2125 GMC Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2125 GMC - Lost Communication With Telematic Unit - AutoCodes.com — U2125 GMC Code - Lost Communication With Telematic Unit

What does this mean?

What are the Possible Causes of the DTC U2125 GMC?

Faulty Telematic Unit
Telematic Unit harness is open or shorted
Telematic Unit circuit poor electrical connection

How to Fix the DTC U2125 GMC?

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 U2125 GMC 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 U2125 GMC Code

1. What are the common symptoms of OBDII code U2125 GMC (Lost Communication With Telematic Unit)?

- Common symptoms include a malfunction indicator light (MIL) illuminated on the dashboard, loss of communication with the telematic unit, and potential issues with vehicle data transfer.

2. What are some possible causes of OBDII code U2125 GMC?

- The code U2125 GMC may be triggered by a faulty telematic unit, damaged wiring or connectors related to the telematic system, a software glitch, or a communication network issue.

3. How can I diagnose OBDII code U2125 GMC?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the trouble code, checking for any related codes, inspecting the telematic unit and its connections, and performing a thorough inspection of the wiring harness.

4. What are the repair options for OBDII code U2125 GMC?

- Repair options for code U2125 GMC may include repairing or replacing the faulty telematic unit, repairing damaged wiring or connectors, updating software if necessary, and ensuring proper communication network functionality.

5. Can I drive my vehicle with OBDII code U2125 GMC?

- It is generally not recommended to drive a vehicle with an unresolved U2125 GMC code, as it may lead to further issues with data transfer and potentially affect vehicle performance or safety systems.

6. How much does it typically cost to repair OBDII code U2125 GMC?

- The cost of repairing OBDII code U2125 GMC can vary depending on the specific cause of the issue, the extent of repairs needed, and labor rates in your area. It's advisable to consult a professional mechanic for an accurate estimate.

7. Is it possible to reset OBDII code U2125 GMC without fixing the underlying issue?

- While clearing the trouble code may temporarily turn off the MIL, it is crucial to address the root cause of the communication loss with the telematic unit to prevent the code from reoccurring and ensure proper vehicle operation.

8. Can a DIY enthusiast repair OBDII code U2125 GMC at home?

- Depending on the underlying cause, some DIY enthusiasts with the necessary tools and skills may be able to address OBDII code U2125 GMC at home. However, complex issues or those involving specialized equipment may require professional assistance.

9. Will disconnecting the battery reset OBDII code U2125 GMC?

- Disconnecting the battery may reset the trouble code temporarily, but it is not a guaranteed solution. It's crucial to diagnose the root cause of the communication loss with the telematic unit to prevent the code from reappearing.

10. How can I prevent OBDII code U2125 GMC from occurring in the future?

- Regular maintenance, including checking the telematic unit and related wiring for damage, ensuring proper connections, and promptly addressing any communication issues, can help prevent OBDII code U2125 GMC from occurring in the future.