AutoCodes – GMC – U2124 GMC

U2124 GMC Code - Lost Communication With Audio Amplifier

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Audio Amplifier, Audio Amplifier harness is open or shorted, Audio Amplifier 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: U2124 GMC indicates Lost Communication With Audio Amplifier.
Common causes: Common causes include Faulty Audio Amplifier, Audio Amplifier harness is open or shorted, Audio Amplifier 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 521

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 U2124 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 U2124 GMC - Lost Communication With Audio Amplifier - AutoCodes.com — U2124 GMC Code - Lost Communication With Audio Amplifier

What does this mean?

What are the Possible Causes of the DTC U2124 GMC?

Faulty Audio Amplifier
Audio Amplifier harness is open or shorted
Audio Amplifier circuit poor electrical connection

How to Fix the DTC U2124 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 U2124 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 U2124 GMC Code

1. What are common symptoms of OBDII code U2124 in a GMC related to lost communication with the audio amplifier?

Symptoms may include no sound from the audio system, malfunctioning controls on the audio unit, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U2124 in a GMC indicating lost communication with the audio amplifier?

Potential causes include a faulty audio amplifier, damaged wiring or connectors, a blown fuse, or issues with the vehicle's communication network.

3. How can I diagnose OBDII code U2124 in my GMC if I suspect a problem with the audio amplifier communication?

You can start by checking the audio amplifier fuse, inspecting the wiring and connectors for damage, and using a diagnostic tool to scan for specific communication errors.

4. Is it safe to continue driving my GMC with OBDII code U2124 related to the audio amplifier communication issue?

It is generally safe to drive the vehicle with this code, but it is recommended to have the issue diagnosed and repaired as soon as possible to ensure proper functioning of the audio system.

5. Can I repair OBDII code U2124 in my GMC related to lost communication with the audio amplifier myself?

If you have experience with automotive electrical systems, you may be able to troubleshoot and repair the issue yourself by checking for wiring faults, loose connections, or a faulty audio amplifier.

6. Will resetting the OBDII code U2124 in my GMC fix the communication problem with the audio amplifier?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the lost communication with the audio amplifier. Proper diagnosis and repair are necessary.

7. How much does it typically cost to repair OBDII code U2124 in a GMC due to communication problems with the audio amplifier?

Repair costs can vary depending on the specific cause of the issue. It may range from a simple fuse replacement to a more complex repair involving the audio amplifier or wiring repairs.

8. Are there any preventive maintenance tips to avoid encountering OBDII code U2124 in a GMC related to the audio system?

Regularly checking the audio system for proper operation, ensuring all connections are secure, and addressing any electrical issues promptly can help prevent communication problems with the audio amplifier.

9. Can extreme weather conditions or water damage cause OBDII code U2124 in a GMC related to communication issues with the audio amplifier?

Yes, exposure to extreme weather conditions or water damage can potentially lead to electrical issues, including communication problems with the audio amplifier, triggering OBDII code U2124.

10. How long does it typically take to diagnose and repair OBDII code U2124 in a GMC indicating lost communication with the audio amplifier?

The diagnosis and repair time can vary depending on the specific cause of the issue. It may range from a quick inspection and fuse replacement to a more extensive troubleshooting process that could take a few hours to complete.