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Engine-Codes – GMC – P0271 2016 GMC Sierra

P0271 2016 GMC Sierra Code - Cylinder 4 Injector Control Circuit High Voltage

Quick Answer

The diagnostic trouble code P0271 for a 2016 GMC Sierra indicates an issue with the Cylinder 4 Injector Control Circuit High Voltage. Common causes include Faulty fuel injector in cylinder 4, Short or open circuit in the wiring harness connected to the fuel injector, Malfunctioning Engine Control Module (ECM). 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 2016 GMC Sierra indicates Cylinder 4 Injector Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector in cylinder 4, Short or open circuit in the wiring harness connected to the fuel injector, Malfunctioning Engine Control Module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0271 2016 GMC Sierra Description

The diagnostic trouble code P0271 for a 2016 GMC Sierra indicates an issue with the Cylinder 4 Injector Control Circuit High Voltage. This means that the Engine Control Module (ECM) has detected a higher than normal voltage in the control circuit for the fuel injector in cylinder 4. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber for efficient combustion. When the voltage in the control circuit is too high, it can lead to improper fuel delivery, which can affect the engine's performance.

OBDII Code P0271 2016 GMC Sierra - Cylinder 4 Injector Control Circuit High Voltage
P0271 2016 GMC Sierra Code - Cylinder 4 Injector Control Circuit High Voltage

Common Causes of P0271 2016 GMC Sierra

  1. Faulty fuel injector in cylinder 4
  2. Short or open circuit in the wiring harness connected to the fuel injector
  3. Malfunctioning Engine Control Module (ECM)
  4. Issues with the fuel injector driver within the ECM
  5. Corrosion or damage to the electrical connections related to the fuel injector

Symptoms of P0271 2016 GMC Sierra

  1. Engine misfires
  2. Rough idling or vibrations
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Check Engine Light illuminated

How to Fix P0271 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness and electrical connections associated with the fuel injector in cylinder 4.
  2. Test the fuel injector in cylinder 4 to determine if it is functioning properly or needs replacement.
  3. Check the ECM for any faults or errors related to the injector control circuit high voltage.
  4. If necessary, replace the faulty fuel injector, repair any damaged wiring or connections, and reprogram the ECM to ensure proper operation.
  5. Clear the diagnostic trouble codes, reset the ECM, and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0271 2016 GMC Sierra

The typical repair costs for addressing the Cylinder 4 Injector Control Circuit High Voltage issue can vary depending on the specific cause of the problem and the labor rates at the auto repair shop. In general, replacing a fuel injector can cost between $150 to $300 per injector, while diagnosing and repairing wiring or ECM issues can add to the total cost. Overall, the total repair cost for this issue could range from $300 to $800 or more, including parts and labor. It's recommended to consult with a qualified mechanic or repair shop to get an accurate estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P0271 2016 GMC Sierra

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

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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.

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