AutoCodes – GMC – U0254 GMC

U0254 GMC Code - Lost Communication With Remote Start 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 Start Module, Remote Start Module harness is open or shorted, Remote Start 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: U0254 GMC indicates Lost Communication With Remote Start Module.
Common causes: Common causes include Faulty Remote Start Module, Remote Start Module harness is open or shorted, Remote Start 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 508

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 U0254 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 Start Module has not been received.

OBDII Code U0254 GMC - Lost Communication With Remote Start Module - AutoCodes.com — U0254 GMC Code - Lost Communication With Remote Start Module

What does this mean?

What are the Possible Causes of the DTC U0254 GMC?

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

How to Fix the DTC U0254 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 U0254 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 U0254 GMC Code

1. What are the common symptoms of OBDII code U0254 GMC (Lost Communication With Remote Start Module)?

- Common symptoms include the remote start system not functioning, the vehicle not starting remotely, and dashboard warning lights related to the remote start system.

2. What are the possible causes of OBDII code U0254 GMC?

- Possible causes include a malfunctioning remote start module, wiring issues, poor connections, software glitches, or a faulty remote start key fob.

3. How can I diagnose the issue related to OBDII code U0254 GMC?

- Diagnosis typically involves checking the connections and wiring of the remote start module, verifying the functionality of the key fob, and using a diagnostic scanner to communicate with the module.

4. What are some repair tips for addressing OBDII code U0254 GMC?

- Repair tips may include checking and repairing any damaged wiring, ensuring all connections are secure, resetting the remote start system, and reprogramming the key fob if necessary.

5. Can I fix OBDII code U0254 GMC on my own, or do I need to visit a mechanic?

- Depending on your experience and knowledge of automotive electrical systems, you may be able to troubleshoot and repair the issue yourself. However, if you are unsure or the problem persists, it's advisable to seek professional help.

6. Is it safe to continue driving with OBDII code U0254 GMC present?

- While the code itself may not affect the drivability of the vehicle, it's essential to address the communication issue with the remote start module to ensure the system functions correctly in the future.

7. How much does it typically cost to repair OBDII code U0254 GMC?

- The cost of repairs can vary depending on the underlying cause of the issue. It may range from a simple fix like reconnecting a wire to a more complex repair involving module replacement.

8. Can weather conditions affect the remote start module communication and trigger OBDII code U0254 GMC?

- Yes, extreme weather conditions such as heavy rain, snow, or extreme temperatures can sometimes cause electrical connections to malfunction, leading to communication errors with the remote start module.

9. Will disconnecting the vehicle's battery reset OBDII code U0254 GMC?

- Disconnecting the battery may reset the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

10. How can I prevent OBDII code U0254 GMC from occurring in the future?

- To prevent the code from reoccurring, it's essential to perform regular maintenance checks on the remote start system, keep the key fob in good condition, and address any wiring or connection issues promptly.