AutoCodes – Buick – U0249 Buick

U0249 Buick 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 Buick 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 489

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

What does this mean?

What are the Possible Causes of the DTC U0249 Buick?

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 Buick?

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 Buick 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 Buick Code

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

- Common symptoms include the rear entertainment system inoperative, screen display issues, and loss of control over rear entertainment functions.

2. What can cause the OBDII code U0249 "Lost Communication With Rear Entertainment Control Module" in a Buick?

- Possible causes include a faulty rear entertainment control module, damaged wiring or connectors, software issues, or a communication network problem.

3. How can I diagnose the issue causing the U0249 OBDII code in my Buick's rear entertainment system?

- Diagnosis involves checking the rear entertainment control module for power and ground, inspecting wiring for damage, and using a scan tool to check for communication errors.

4. Are there any simple checks I can perform before taking my Buick in for U0249 code repairs?

- You can start by checking the fuses related to the rear entertainment system, ensuring all connections are secure, and clearing the code to see if it returns.

5. Can a DIY enthusiast repair the U0249 code related to the Rear Entertainment Control Module in a Buick?

- While some basic checks and repairs like fuse replacement or connector cleaning can be done DIY, diagnosing and fixing complex issues may require professional expertise.

6. Is it safe to continue driving my Buick with the U0249 code indicating a problem with the Rear Entertainment Control Module?

- It is generally safe to drive, but the rear entertainment system may not function properly. If other issues are present, it's best to address them promptly.

7. How much does it typically cost to repair the U0249 code in a Buick's rear entertainment system?

- The cost can vary depending on the exact cause of the issue. Simple fixes like fuse replacement may be inexpensive, while module replacement or wiring repairs can be more costly.

8. Can resetting the system or disconnecting the battery resolve the U0249 code in a Buick?

- In some cases, resetting the system or disconnecting the battery may temporarily clear the code, but if the underlying issue persists, the code is likely to return.

9. Will the U0249 code in a Buick's OBDII system affect the vehicle's overall performance?

- The code is related to the rear entertainment system and should not impact the vehicle's drivability. However, addressing the issue promptly is recommended.

10. How long does it typically take to repair the U0249 code related to the Rear Entertainment Control Module in a Buick?

- The repair time can vary based on the cause of the issue. Simple fixes may take a short time, while more complex problems could require several hours or more for diagnosis and repair.