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Engine-Codes – Chevrolet – P0274 2018 Chevrolet Silverado

P0274 2018 Chevrolet Silverado Code - Cylinder 5 Injector Control Circuit High Voltage

Quick Answer

The P0274 code for a 2018 Chevrolet Silverado indicates a problem with the Cylinder 5 Injector Control Circuit having high voltage. Common causes include Faulty fuel injector for cylinder 5, Wiring or connector issues in the injector control circuit, Engine control module (ECM) malfunction. 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 2018 Chevrolet Silverado indicates Cylinder 5 Injector Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector for cylinder 5, Wiring or connector issues in the injector control circuit, Engine control module (ECM) malfunction.
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 Aug 19, 2024
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Code P0274 2018 Chevrolet Silverado Description

The P0274 code for a 2018 Chevrolet Silverado indicates a problem with the Cylinder 5 Injector Control Circuit having high voltage. This means that the fuel injector for cylinder 5 is receiving a higher voltage signal than what is expected. This issue can disrupt the proper fuel delivery to the engine, leading to poor performance, decreased fuel efficiency, and potential damage to the engine over time. The fuel injector control circuit is responsible for regulating the amount of fuel that is injected into the combustion chamber, and a high voltage condition can lead to an excessively rich fuel mixture, causing rough idling, misfires, and potential engine damage.

OBDII Code P0274 2018 Chevrolet Silverado - Cylinder 5 Injector Control Circuit High Voltage
P0274 2018 Chevrolet Silverado Code - Cylinder 5 Injector Control Circuit High Voltage

Common Causes of P0274 2018 Chevrolet Silverado

  1. Faulty fuel injector for cylinder 5
  2. Wiring or connector issues in the injector control circuit
  3. Engine control module (ECM) malfunction
  4. Fuel pump relay malfunction
  5. Issues with the fuel pressure regulator

Symptoms of P0274 2018 Chevrolet Silverado

  1. Rough idling or engine misfires
  2. Decreased fuel efficiency
  3. Engine hesitation or stalling
  4. Check Engine Light illuminated
  5. Engine performance issues such as lack of power or acceleration

How to Fix P0274 2018 Chevrolet Silverado

  1. Diagnose the specific cause of the high voltage condition in the Cylinder 5 Injector Control Circuit using a diagnostic scanner.
  2. Check the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the fuel injector for cylinder 5 to ensure it is functioning correctly. Replace if necessary.
  4. Inspect the ECM for any faults or reprogram if needed.
  5. Clear the trouble codes, reset the ECM, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0274 2018 Chevrolet Silverado

The cost of repairing a P0274 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. On average, the cost of parts for a fuel injector replacement can range from $150 to $300, while labor costs can range from $80 to $150 per hour. Additional costs may include diagnostic fees and any other necessary repairs. Overall, the total repair cost for this issue can range from $200 to $600 or more, depending on the extent of the problem and the labor rates in your area. It is recommended to consult with a certified mechanic or repair shop for a more accurate cost estimate.

What does this mean?

Tech Notes for P0274 2018 Chevrolet Silverado

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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