AutoCodes – GMC – P0271 GMC

P0271 GMC Code - Cylinder 4 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 4, Faulty Fuel Injector 4, Plugged Fuel Injector 4. 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: P0271 GMC indicates Cylinder 4 Injector Control Circuit High Voltage.
Common causes: Common causes include Dirty Fuel Injector 4, Faulty Fuel Injector 4, Plugged Fuel Injector 4.
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 400

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 P0271 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 P0271 GMC - Cylinder 4 Injector Control Circuit High Voltage - AutoCodes.com — P0271 GMC Code - Cylinder 4 Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0271 GMC?

Dirty Fuel Injector 4
Faulty Fuel Injector 4
Plugged Fuel Injector 4
Fuel Injector #4 harness is open or shorted
Fuel Injector #4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0271 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 P0271 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 P0271 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P0271 2014 GMC Sierra — Cylinder 4 Injector Control Circuit High Voltage
P0271 2015 GMC Sierra — Cylinder 4 Injector Control Circuit High Voltage
P0271 2016 GMC Sierra — Cylinder 4 Injector Control Circuit High Voltage
P0271 2017 GMC Sierra — Cylinder 4 Injector Control Circuit High Voltage
P0271 2018 GMC Sierra — Cylinder 4 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 P0271 GMC Code

1. What are common symptoms of OBDII code P0271 GMC (Cylinder 4 Injector Control Circuit High Voltage)?

The common symptoms of code P0271 GMC include rough idling, engine misfires, decreased fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P0271 GMC?

The potential causes of code P0271 GMC include a faulty fuel injector in cylinder 4, wiring issues in the injector circuit, a poor electrical connection, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the issue related to OBDII code P0271 GMC?

To diagnose code P0271 GMC, you can perform a visual inspection of the injector and its wiring, check for continuity in the injector circuit, use a multimeter to test voltage at the injector, and conduct a thorough scan with an OBDII scanner.

4. Is it safe to drive with OBDII code P0271 GMC active?

It is not recommended to drive with an active P0271 GMC code, as it can lead to further damage to the engine and catalytic converter. It is best to address the issue promptly to avoid potential safety hazards.

5. How can I repair OBDII code P0271 GMC (Cylinder 4 Injector Control Circuit High Voltage)?

The repair process for code P0271 GMC typically involves replacing the faulty fuel injector in cylinder 4, repairing or replacing damaged wiring in the injector circuit, ensuring proper electrical connections, and resetting the ECM.

6. Can a DIY enthusiast fix OBDII code P0271 GMC at home?

While some DIY enthusiasts may have the skills to address code P0271 GMC, it is recommended to consult a professional mechanic for proper diagnosis and repair, especially when dealing with intricate electrical components.

7. Will resetting the OBDII code P0271 GMC resolve the issue?

Simply resetting the code may temporarily clear the Check Engine Light, but it will not fix the underlying problem causing code P0271 GMC. It is crucial to diagnose and repair the root cause of the issue.

8. How much does it cost to repair OBDII code P0271 GMC?

The cost of repairing code P0271 GMC can vary depending on the specific issue, parts needed, labor rates, and whether you choose a dealership or an independent mechanic. It is advisable to obtain multiple quotes for an accurate estimate.

9. Can a bad spark plug cause OBDII code P0271 GMC to trigger?

While a bad spark plug can lead to engine misfires and performance issues, it is not a direct cause of OBDII code P0271 GMC. The code is specifically related to the control circuit of the fuel injector in cylinder 4.

10. How long does it take to repair OBDII code P0271 GMC?

The repair time for code P0271 GMC can vary based on the extent of the issue, availability of parts, and the expertise of the mechanic. In general, it may take a few hours to a full day to diagnose and repair the problem.