AutoCodes – GMC – C0274 GMC

C0274 GMC 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 GMC 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 1,961

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 GMC 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 GMC - Isolation Valve High Temperature - AutoCodes.com — C0274 GMC Code - Isolation Valve High Temperature

What does this mean?

What are the Possible Causes of the DTC C0274 GMC?

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 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 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 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.

Need more information about the C0274 GMC code?

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Need Help with the Code?

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

Information for Specific GMC Models

C0274 2014 GMC Sierra — Isolation Valve High Temperature
C0274 2015 GMC Sierra — Isolation Valve High Temperature
C0274 2016 GMC Sierra — Isolation Valve High Temperature
C0274 2017 GMC Sierra — Isolation Valve High Temperature
C0274 2018 GMC Sierra — 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 GMC Code

1. What are the common symptoms of OBDII code C0274 GMC (Isolation Valve High Temperature)?

The common symptoms of this code may include the illumination of the check engine light, reduced engine performance, and potential issues with the brake system.

2. What are the possible causes of OBDII code C0274 GMC?

Possible causes of this code include a faulty isolation valve, wiring issues, a malfunctioning brake pressure modulator valve, or a problem with the ABS control module.

3. How serious is OBDII code C0274 GMC?

While this code may not cause immediate safety concerns, it is still important to address it promptly to prevent potential brake system malfunctions and ensure safe driving conditions.

4. How can I diagnose OBDII code C0274 GMC?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault code, conducting a visual inspection of the brake system components, and testing the isolation valve and related wiring for any issues.

5. Can I continue driving with OBDII code C0274 GMC active?

It is not recommended to continue driving with this code active, as it can lead to brake system malfunctions and compromise the vehicle's overall safety.

6. What are some repair tips for fixing OBDII code C0274 GMC?

Repair tips may include checking and repairing any damaged wiring, replacing the isolation valve if necessary, ensuring proper connections, and clearing the fault code to see if it reoccurs.

7. How much does it typically cost to repair OBDII code C0274 GMC?

The cost of repairing this code can vary depending on the specific cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to consult a mechanic for an accurate estimate.

8. Can OBDII code C0274 GMC be triggered by a loose gas cap?

No, OBDII code C0274 GMC specifically relates to the isolation valve high temperature issue within the brake system and is not related to a loose gas cap.

9. Is OBDII code C0274 GMC a common problem in GMC vehicles?

While this code may not be as common as some other OBDII codes, it can still occur in GMC vehicles equipped with ABS systems and should be addressed promptly to avoid potential safety risks.

10. Will OBDII code C0274 GMC cause my vehicle to fail an emissions test?

OBDII code C0274 GMC is not directly related to emissions, so it should not cause your vehicle to fail an emissions test. However, it is still important to address the issue to ensure the overall functionality and safety of your vehicle.