AutoCodes – Generic – U0250

U0250 Code - Lost Communication With Impact Classification System Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. 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 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 3,062

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 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U0250 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Impact Classification System Module has not been received.

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

What does this mean?

What are the Possible Causes of the DTC U0250?

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?

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 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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Information for Specific Makes

U0250 Buick — Lost Communication With Impact Classification System Module
U0250 Cadillac — Lost Communication With Impact Classification System Module
U0250 Chevrolet — Lost Communication With Impact Classification System Module
U0250 GMC — Lost Communication With Impact Classification System Module

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.