AutoCodes – Chevrolet – C0274 Chevrolet

C0274 Chevrolet Code - Isolation Valve High Temperature

Quick Answer

The solenoid valves are integral parts of the brake pressure modulator. Common causes include Faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV), Brake Pressure Modulator Valve harness is open or shorted, Brake Pressure Modulator Valve 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: C0274 Chevrolet indicates Isolation Valve High Temperature.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV), Brake Pressure Modulator Valve harness is open or shorted, Brake Pressure Modulator Valve 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 6,128

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 05, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0274 Chevrolet Description

The solenoid valves are integral parts of the brake pressure modulator. The brake pressure modulator contains an isolation solenoid valve and a dump solenoid valve for each wheel. A traction/stability control supply solenoid valve and an isolation solenoid valve for each brake circuit. The solenoid valves are not engaged during normal system operation. When the ABS, the traction control, or the stability control operation is required the Electronic Brake Control Module (EBCM) turns the required solenoid ON. The Diagnostic Trouble Code (DTC) will be set due to the extended operation of the ABS, the traction control, or the stability control.

OBDII Code C0274 Chevrolet - Isolation Valve High Temperature - AutoCodes.com — C0274 Chevrolet Code - Isolation Valve High Temperature

What does this mean?

What are the Possible Causes of the DTC C0274 Chevrolet?

Faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV)
Brake Pressure Modulator Valve harness is open or shorted
Brake Pressure Modulator Valve circuit poor electrical connection

How to Fix the DTC C0274 Chevrolet?

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 does this mean?

Code Tech Notes

If the C0274 code is combined with other codes, fix other codes first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0274 Chevrolet 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.

Need more information about the C0274 Chevrolet code?

Need more information on how to fix the C0274 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0274 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

C0274 2014 Chevrolet Silverado — Isolation Valve High Temperature
C0274 2015 Chevrolet Silverado — Isolation Valve High Temperature
C0274 2016 Chevrolet Silverado — Isolation Valve High Temperature
C0274 2017 Chevrolet Silverado — Isolation Valve High Temperature
C0274 2018 Chevrolet Silverado — Isolation Valve High Temperature

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 C0274 Chevrolet Code

1. What does the OBDII code C0274 mean on a Chevrolet?

C0274 indicates an issue with the isolation valve in the vehicleâ€™s brake system, specifically that it is detecting abnormally high temperatures.

2. What are the symptoms of the C0274 code on a Chevrolet?

Common symptoms include the ABS warning light illuminating, reduced braking performance, or the ABS system not functioning properly.

3. What causes the C0274 code to appear on a Chevrolet?

This code is typically caused by a malfunctioning isolation valve, an electrical fault in the valve circuit, overheating due to excessive brake use, or a failing ABS module.

4. Can I drive my Chevrolet with the C0274 code?

While the vehicle may still be drivable, the ABS system may not function correctly, which could compromise braking safety in certain conditions. Itâ€™s best to address the issue promptly.

5. How is the C0274 code diagnosed on a Chevrolet?

A mechanic will use a scan tool to confirm the code, check the isolation valve and its wiring for faults, and inspect the ABS module for functionality.

6. What repairs are needed to fix the C0274 code on a Chevrolet?

Repairs may include replacing the faulty isolation valve, repairing damaged wiring, or reprogramming or replacing the ABS module if necessary.

7. How much does it cost to fix the C0274 code on a Chevrolet?

Repair costs can vary but typically range from $150 to $800 depending on whether the issue is with the valve, wiring, or ABS module.

8. What preventive measures can help avoid the C0274 code?

Regular brake system maintenance, avoiding excessive brake usage, and ensuring proper fluid levels can help prevent issues with the isolation valve.

9. Can a faulty ABS fuse cause the C0274 code on a Chevrolet?

While unlikely, a blown ABS fuse could cause related electrical issues that might trigger this code. A thorough inspection is necessary to rule this out.

10. Does clearing the C0274 code solve the problem?

Clearing the code will reset the warning light temporarily, but the underlying issue must be repaired to prevent the code from returning and ensure safe operation.