AutoCodes – Chevrolet – U0249 Chevrolet

U0249 Chevrolet Code - Lost Communication With Rear Entertainment Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Entertainment Control Module, Rear Entertainment Control Module harness is open or shorted, Rear Entertainment 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: U0249 Chevrolet indicates Lost Communication With Rear Entertainment Control Module.
Common causes: Common causes include Faulty Rear Entertainment Control Module, Rear Entertainment Control Module harness is open or shorted, Rear Entertainment 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 963

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 Apr 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0249 Chevrolet Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) 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, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Rear Entertainment Control Module has not been received.

OBDII Code U0249 Chevrolet - Lost Communication With Rear Entertainment Control Module - AutoCodes.com — U0249 Chevrolet Code - Lost Communication With Rear Entertainment Control Module

What does this mean?

What are the Possible Causes of the DTC U0249 Chevrolet?

Faulty Rear Entertainment Control Module
Rear Entertainment Control Module harness is open or shorted
Rear Entertainment Control Module circuit poor electrical connection

How to Fix the DTC U0249 Chevrolet?

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 U0249 Chevrolet 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 U0249 Chevrolet Code

1. What are the common symptoms of OBDII code U0249 in a Chevrolet related to the Rear Entertainment Control Module?

Common symptoms include the rear entertainment system not functioning, no audio or video output, and issues with the rear seat entertainment controls.

2. What are the possible causes of the OBDII code U0249 in a Chevrolet indicating a lost communication with the Rear Entertainment Control Module?

Possible causes include a faulty rear entertainment control module, damaged wiring or connectors, or issues with the vehicle's network communication system.

3. How can I diagnose the U0249 code in my Chevrolet related to the Rear Entertainment Control Module?

Diagnosis involves checking the wiring and connectors associated with the rear entertainment control module, testing the module itself, and using a diagnostic scanner to communicate with the module.

4. Is it safe to continue driving my Chevrolet with the U0249 code indicating lost communication with the Rear Entertainment Control Module?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to restore functionality to the rear entertainment system.

5. Can I repair the U0249 code related to the Rear Entertainment Control Module in my Chevrolet myself?

Depending on your technical skills and access to tools, you may be able to repair this issue yourself by replacing the rear entertainment control module, repairing wiring or connectors, or resetting the module using a diagnostic scanner.

6. Are there any common mistakes to avoid when dealing with the U0249 code in a Chevrolet with a Rear Entertainment Control Module issue?

Avoid overlooking basic troubleshooting steps like checking fuses and connections, as these simple fixes can sometimes resolve the problem without requiring major repairs.

7. How much does it typically cost to repair the U0249 code in a Chevrolet due to a lost communication with the Rear Entertainment Control Module?

Repair costs can vary depending on the underlying issue, but expect to pay for diagnostic time, replacement parts, and labor, which can range from a few hundred to a few thousand dollars.

8. Can the U0249 code in a Chevrolet be intermittent, causing the Rear Entertainment Control Module to function sporadically?

Yes, intermittent issues with the rear entertainment control module can cause the U0249 code to come and go, making it important to diagnose the problem thoroughly to pinpoint the root cause.

9. Will resetting the OBDII code U0249 related to the Rear Entertainment Control Module in my Chevrolet make the problem go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue with the rear entertainment control module is not addressed, the code is likely to reappear.

10. Is it necessary to visit a dealership or a specialist to repair the U0249 code in my Chevrolet linked to the Rear Entertainment Control Module, or can a general mechanic handle it?

While a dealership or specialist may have specific expertise, a qualified general mechanic should be able to diagnose and repair the U0249 code related to the Rear Entertainment Control Module in your Chevrolet.