AutoCodes – GMC – C0274 2015 GMC Sierra

C0274 2015 GMC Sierra 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 2015 GMC Sierra 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 200

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 Jul 05, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0274 2015 GMC Sierra 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 2015 GMC Sierra - Isolation Valve High Temperature - AutoCodes.com — C0274 2015 GMC Sierra Code - Isolation Valve High Temperature

What does this mean?

What are the Possible Causes of the DTC C0274 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra code?

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Need Help with the Code?

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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 C0274 2015 GMC Sierra Code

1. What does the OBDII code C0274 mean on a 2015 GMC Sierra?

C0274 indicates an issue with the isolation valve circuit, specifically detecting a high temperature condition in the valve, which is part of the ABS (Anti-lock Brake System).

2. What are the common symptoms of code C0274 in a 2015 GMC Sierra?

Symptoms may include the ABS warning light on the dashboard, a possible reduction in braking performance, and the ABS system being disabled.

3. What causes the C0274 code to appear on a 2015 GMC Sierra?

Common causes include a malfunctioning isolation valve, damaged wiring or connectors in the ABS circuit, overheating of the valve, or a faulty ABS module.

4. Can code C0274 cause safety issues while driving?

Yes, since it affects the ABS system, it can lead to reduced braking performance during emergency stops or on slippery surfaces, increasing the risk of an accident.

5. How is the C0274 code diagnosed on a 2015 GMC Sierra?

A technician will use a scan tool to confirm the code, inspect the ABS wiring and connectors for damage, and test the isolation valve and ABS module for proper functionality.

6. Can I still drive my 2015 GMC Sierra with the C0274 code active?

While the vehicle may still be drivable, it is not recommended as the ABS system may be disabled, reducing braking safety in certain conditions.

7. How do you fix the C0274 code on a 2015 GMC Sierra?

Repairs may involve replacing the isolation valve, repairing damaged wiring or connectors, or replacing the ABS module if it is found to be faulty.

8. How much does it cost to repair the C0274 code on a GMC Sierra?

Repair costs can vary depending on the exact issue, but replacing an isolation valve might cost between $200 and $500, while ABS module replacement could exceed $1,000 including labor.

9. Can a C0274 code be caused by low brake fluid?

No, this specific code is related to the isolation valve and its temperature, not the brake fluid level. However, low brake fluid can trigger other ABS-related codes.

10. Will clearing the C0274 code solve the problem on my 2015 GMC Sierra?

Clearing the code without addressing the underlying issue will not fix the problem, and the code will likely return. Proper diagnosis and repair are necessary.