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Engine-Codes – GMC – P0273 2018 GMC Sierra

P0273 2018 GMC Sierra Code - Cylinder 5 Injector Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P0273 in a 2018 GMC Sierra indicates an issue with the Cylinder 5 Injector Control Circuit experiencing low voltage. Common causes include Faulty wiring or connectors in the injector control circuit, A malfunctioning fuel injector in Cylinder 5, Issues with the PCM or fuel injector driver module. 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
P0273 2018 GMC Sierra indicates Cylinder 5 Injector Control Circuit Low Voltage.
Common causes
Common causes include Faulty wiring or connectors in the injector control circuit, A malfunctioning fuel injector in Cylinder 5, Issues with the PCM or fuel injector driver module.
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 P0273 2018 GMC Sierra Description

The diagnostic trouble code P0273 in a 2018 GMC Sierra indicates an issue with the Cylinder 5 Injector Control Circuit experiencing low voltage. In a fuel-injected engine, each cylinder has its own fuel injector responsible for delivering the precise amount of fuel needed for combustion. The injector control circuit is a crucial component that regulates the fuel flow to the cylinder.

OBDII Code P0273 2018 GMC Sierra - Cylinder 5 Injector Control Circuit Low Voltage
P0273 2018 GMC Sierra Code - Cylinder 5 Injector Control Circuit Low Voltage

Common Causes of P0273 2018 GMC Sierra

  1. Faulty wiring or connectors in the injector control circuit
  2. A malfunctioning fuel injector in Cylinder 5
  3. Issues with the PCM or fuel injector driver module
  4. Corrosion or damage to the electrical connections
  5. Poor quality fuel or clogged fuel filter affecting fuel delivery

Symptoms of P0273 2018 GMC Sierra

  1. Rough idling or engine misfires
  2. Decreased fuel efficiency
  3. Engine hesitation or stalling
  4. Illumination of the Check Engine Light
  5. Reduced engine power

How to Fix P0273 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring and connectors in the injector control circuit to check for any damage or corrosion. Repair or replace any damaged components.
  2. Test the fuel injector in Cylinder 5 to determine if it is functioning correctly. Replace the injector if necessary.
  3. Check the PCM and fuel injector driver module for any faults or malfunctions. Repair or replace these components as needed.
  4. Clear the diagnostic trouble codes from the vehicle's system and perform a test drive to ensure that the issue has been resolved.
  5. If the problem persists, seek the assistance of a professional mechanic to conduct further diagnostics and repairs.

Cost to Fix P0273 2018 GMC Sierra

The typical repair costs for addressing a Cylinder 5 Injector Control Circuit Low Voltage issue in a 2018 GMC Sierra can range from $200 to $600, depending on the specific cause of the problem and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources to ensure an accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

What does this mean?

Tech Notes for P0273 2018 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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