AutoCodes – GMC – U0250 GMC

U0250 GMC Code - Lost Communication With Impact Classification System 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 Impact Classification System Module, Impact Classification System Module harness is open or shorted, Impact Classification System 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: U0250 GMC indicates Lost Communication With Impact Classification System Module.
Common causes: Common causes include Faulty Impact Classification System Module, Impact Classification System Module harness is open or shorted, Impact Classification System 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 562

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 U0250 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 Impact Classification System Module has not been received.

OBDII Code U0250 GMC - Lost Communication With Impact Classification System Module - AutoCodes.com — U0250 GMC Code - Lost Communication With Impact Classification System Module

What does this mean?

What are the Possible Causes of the DTC U0250 GMC?

Faulty Impact Classification System Module
Impact Classification System Module harness is open or shorted
Impact Classification System Module circuit poor electrical connection

How to Fix the DTC U0250 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 U0250 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 U0250 GMC Code

1. What are the common symptoms of OBDII code U0250 GMC?

The common symptoms of code U0250 GMC, Lost Communication With Impact Classification System Module, include the airbag warning light staying on, loss of communication with the impact classification system, and potential issues with the vehicle's restraint system.

2. What can cause the OBDII code U0250 GMC to appear?

The code U0250 GMC is usually triggered by a communication failure between the vehicle's onboard diagnostic system and the impact classification system module, which can be caused by damaged wiring, a faulty module, or a blown fuse.

3. How can I diagnose the OBDII code U0250 GMC?

Diagnosing code U0250 GMC involves using a diagnostic scanner to retrieve the fault codes, checking the wiring and connectors for damage, testing the impact classification system module, and verifying the status of relevant fuses.

4. What are some possible repair tips for resolving the U0250 GMC code?

Repair tips for resolving code U0250 GMC may include repairing or replacing damaged wiring and connectors, replacing the impact classification system module if necessary, and ensuring all relevant fuses are in good condition.

5. Is it safe to drive with the OBDII code U0250 GMC illuminated?

It is not recommended to drive with the U0250 GMC code illuminated, as it indicates a potential issue with the vehicle's restraint system, which could affect the proper deployment of airbags in the event of an accident.

6. Can I reset the OBDII code U0250 GMC without fixing the underlying issue?

While you can clear the U0250 GMC code using a diagnostic scanner, it is important to address the underlying issue causing the communication failure to prevent the code from reappearing and ensure the proper functioning of the vehicle's safety systems.

7. How much does it typically cost to repair the U0250 GMC code?

The cost of repairing the U0250 GMC code can vary depending on the exact cause of the communication failure, the extent of the damage, and the labor rates of the repair shop. It is recommended to get a diagnostic and repair estimate from a qualified technician.

8. Can a DIY enthusiast fix the U0250 GMC code at home?

While some DIY enthusiasts may be able to diagnose and repair the U0250 GMC code at home, it is recommended to have the issue addressed by a professional technician with experience in diagnosing and repairing communication failures in vehicles.

9. How long does it take to repair the U0250 GMC code?

The time it takes to repair the U0250 GMC code can vary depending on the complexity of the issue, the availability of parts, and the technician's experience. In some cases, the repair can be completed within a few hours, while more complex issues may take longer.

10. Can the U0250 GMC code be a recurring problem?

The U0250 GMC code can be a recurring problem if the underlying issue causing the communication failure is not properly addressed. It is crucial to diagnose the root cause of the problem and ensure it is fixed correctly to prevent the code from reappearing in the future.