AutoCodes – GMC – P0274 GMC

P0274 GMC Code - Cylinder 5 Injector Control Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. Common causes include Dirty Fuel Injector 5, Faulty Fuel Injector 5, Plugged Fuel Injector 5. 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: P0274 GMC indicates Cylinder 5 Injector Control Circuit High Voltage.
Common causes: Common causes include Dirty Fuel Injector 5, Faulty Fuel Injector 5, Plugged Fuel Injector 5.
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 462

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0274 GMC Description

The Engine Control Module (ECM) supplies voltage to each Fuel Injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector control circuit is shorted to voltage for greater than 2 s.

OBDII Code P0274 GMC - Cylinder 5 Injector Control Circuit High Voltage - AutoCodes.com — P0274 GMC Code - Cylinder 5 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0274 GMC?

Dirty Fuel Injector 5
Faulty Fuel Injector 5
Plugged Fuel Injector 5
Fuel injector 5 harness is open or shorted
Fuel injector 5 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0274 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

A clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0274 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 P0274 GMC code?

Need more information on how to fix the P0274 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0274 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0274 2014 GMC Sierra — Cylinder 5 Injector Control Circuit High Voltage
P0274 2015 GMC Sierra — Cylinder 5 Injector Control Circuit High Voltage
P0274 2016 GMC Sierra — Cylinder 5 Injector Control Circuit High Voltage
P0274 2017 GMC Sierra — Cylinder 5 Injector Control Circuit High Voltage
P0274 2018 GMC Sierra — Cylinder 5 Injector Control Circuit High Voltage

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 P0274 GMC Code

1. What does the OBDII code P0274 mean on a GMC vehicle?

P0274 indicates that the Engine Control Module (ECM) has detected a high voltage issue in the fuel injector control circuit for cylinder 5.

2. What are the common symptoms of P0274 in a GMC?

Symptoms may include engine misfires, rough idling, reduced performance, increased fuel consumption, and the check engine light being illuminated.

3. What causes the P0274 code to appear on a GMC?

Common causes include a faulty cylinder 5 fuel injector, damaged or corroded wiring, a defective ECM, or a poor electrical connection in the injector circuit.

4. Can I drive my GMC with a P0274 code?

Driving with a P0274 code is not recommended, as it can lead to poor engine performance and potential long-term engine damage.

5. How do I diagnose a P0274 code on a GMC?

Diagnosis involves checking the wiring and connectors for damage, testing the cylinder 5 fuel injector, and using a multimeter to measure voltage in the injector circuit.

6. How do I fix the P0274 code on my GMC?

Possible fixes include repairing or replacing damaged wiring, replacing the cylinder 5 fuel injector, cleaning corroded connectors, or reprogramming/replacing the ECM if necessary.

7. How much does it cost to fix a P0274 code on a GMC?

Repair costs vary but typically range from $150 to $500 depending on whether the issue is wiring-related or requires a new fuel injector.

8. Can a faulty ECM trigger the P0274 code on a GMC?

Yes, a malfunctioning ECM can cause high voltage issues in the injector control circuit, leading to the P0274 code.

9. What tools are needed to troubleshoot a P0274 code on a GMC?

You may need an OBDII scanner, a multimeter, and basic hand tools to inspect wiring and test the injector circuit.

10. Is a P0274 code specific to GMC vehicles?

No, P0274 is a generic OBDII code that can appear on any vehicle, but the troubleshooting and repair process may vary depending on the make and model.