AutoCodes – Generic – U2124

U2124 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 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 1,355

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

What does this mean?

What are the Possible Causes of the DTC U2124?

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

How to Fix the DTC U2124?

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 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.

Need more information about the U2124 code?

Need more information on how to fix the U2124 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2124 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2124 Buick — Lost Communication With Audio Amplifier
U2124 Cadillac — Lost Communication With Audio Amplifier
U2124 Chevrolet — Lost Communication With Audio Amplifier
U2124 GMC — Lost Communication With Audio Amplifier

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 Code

1. What are common symptoms of OBDII code U2124 (Lost Communication With Audio Amplifier)?

- Common symptoms include loss of audio from the vehicle's speakers, malfunctioning radio or sound system, and error messages on the audio display.

2. What are possible causes of code U2124?

- The code U2124 can be triggered by a faulty audio amplifier, damaged wiring or connectors between the audio system and the amplifier, or a communication error within the vehicle's network.

3. How can I diagnose the cause of OBDII code U2124?

- Diagnosing code U2124 typically involves checking the wiring and connectors between the audio amplifier and the audio system, testing the audio amplifier for proper functionality, and using a diagnostic scanner to identify communication issues within the vehicle network.

4. Can a DIY enthusiast repair OBDII code U2124 at home?

- While some basic troubleshooting steps can be performed at home, repairing code U2124 often requires specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Is it safe to continue driving with OBDII code U2124 present?

- It is generally safe to drive with code U2124, as it primarily affects the vehicle's audio system. However, it is important to address the issue promptly to ensure proper functionality of the audio system and to prevent potential communication errors in the vehicle network.

6. How much does it typically cost to repair OBDII code U2124?

- The cost of repairing code U2124 can vary depending on the underlying cause. Simple fixes like repairing wiring or connectors may be relatively inexpensive, while replacing a faulty audio amplifier can be more costly. It is recommended to obtain a quote from a trusted mechanic.

7. Can a dead battery cause OBDII code U2124 to appear?

- Yes, a dead or disconnected battery can sometimes cause communication errors in the vehicle network, leading to code U2124. Ensuring the battery is properly charged and connected is a good first step in troubleshooting this code.

8. Are there any common recalls related to OBDII code U2124?

- Recalls related to code U2124 are not common, as this issue is often specific to the vehicle's audio system and wiring. It is advised to check with the vehicle manufacturer or a dealership for any relevant recalls.

9. Will resetting the OBDII code U2124 clear the issue permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of code U2124 to prevent ongoing problems.

10. How long does it typically take to repair OBDII code U2124?

- The repair time for code U2124 can vary depending on the specific cause and complexity of the issue. Simple fixes may be completed in a few hours, while more involved repairs could take longer. It is advisable to consult with a mechanic for a more accurate estimate of repair time.