AutoCodes – GMC – U0248 GMC

U0248 GMC Code - Lost Communication With Remote Accessory 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 Remote Accessory Module, Remote Accessory Module harness is open or shorted, Remote Accessory 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: U0248 GMC indicates Lost Communication With Remote Accessory Module.
Common causes: Common causes include Faulty Remote Accessory Module, Remote Accessory Module harness is open or shorted, Remote Accessory 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 754

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 U0248 GMC 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 Remote Accessory Module has not been received.

OBDII Code U0248 GMC - Lost Communication With Remote Accessory Module - AutoCodes.com — U0248 GMC Code - Lost Communication With Remote Accessory Module

What does this mean?

What are the Possible Causes of the DTC U0248 GMC?

Faulty Remote Accessory Module
Remote Accessory Module harness is open or shorted
Remote Accessory Module circuit poor electrical connection

How to Fix the DTC U0248 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 U0248 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 U0248 GMC Code

1. What are common symptoms of OBDII code U0248 GMC (Lost Communication With Remote Accessory Module)?

- Common symptoms include issues with remote start functionality, keyless entry problems, and malfunctioning accessories controlled by the remote module.

2. What are possible causes of the U0248 GMC trouble code?

- The code U0248 typically indicates a communication problem between the vehicle's onboard diagnostic system and the remote accessory module. Causes may include a faulty module, wiring issues, or a poor connection.

3. How can I diagnose the U0248 code related to lost communication with the remote accessory module?

- Diagnosing the U0248 code involves checking the wiring and connections to the remote accessory module, testing the module itself for malfunctions, and using a scan tool to communicate with the vehicle's computer system.

4. Can a DIY enthusiast repair the U0248 GMC trouble code?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the U0248 code 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 the U0248 trouble code present?

- It is generally safe to drive the vehicle with the U0248 code, but it is important to address the underlying communication issue with the remote accessory module to ensure proper functionality of related systems.

6. How much does it typically cost to repair the U0248 GMC trouble code?

- The cost of repairing the U0248 code can vary depending on the underlying cause. Costs may include diagnostic fees, parts replacement, and labor charges, which can range from a hundred to several hundred dollars.

7. Can a dead battery cause the U0248 code to appear?

- A dead or weak battery can sometimes lead to communication errors between modules in the vehicle, potentially triggering the U0248 code. It is advisable to check the battery's condition as part of the diagnostic process.

8. Will resetting the trouble codes make the U0248 code disappear permanently?

- Resetting the trouble codes may temporarily clear the U0248 code, but if the underlying issue with the communication between the vehicle's system and the remote accessory module persists, the code is likely to reappear.

9. Are there any common recalls or technical service bulletins related to the U0248 code in GMC vehicles?

- It is recommended to check with authorized GMC dealerships or online resources for any recalls or technical service bulletins related to the U0248 code in specific GMC models to see if there are known issues or remedies.

10. How can I prevent the U0248 trouble code from occurring in the future?

- To prevent the U0248 code from occurring, it is essential to perform regular vehicle maintenance, check the condition of wiring and connections, and address any communication issues promptly to ensure proper functioning of the remote accessory module.