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Engine-Codes – Generic – P0279

P0279 Code - Cylinder 7 Injector Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P0279 indicates a problem with the cylinder 7 injector control circuit having low voltage. Common causes include Wiring issues such as a short or open circuit, Faulty injector in cylinder 7, Malfunctioning 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
P0279 indicates Cylinder 7 Injector Control Circuit Low Voltage.
Common causes
Common causes include Wiring issues such as a short or open circuit, Faulty injector in cylinder 7, Malfunctioning 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 13, 2024
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Code P0279 Description

The diagnostic trouble code P0279 indicates a problem with the cylinder 7 injector control circuit having low voltage. In a vehicle's fuel injection system, each cylinder has its own fuel injector responsible for delivering the precise amount of fuel needed for combustion. When the control circuit for the injector in cylinder 7 is experiencing low voltage, it can lead to issues with fuel delivery, affecting the engine's performance and efficiency.

OBDII Code P0279 - Cylinder 7 Injector Control Circuit Low Voltage
P0279 Code - Cylinder 7 Injector Control Circuit Low Voltage

Common Causes of P0279

  1. Wiring issues such as a short or open circuit
  2. Faulty injector in cylinder 7
  3. Malfunctioning fuel injector driver module
  4. Problems with the engine control module (ECM)
  5. Corrosion or poor connections in the injector control circuit

Symptoms of P0279

  1. Check Engine Light illuminated
  2. Rough idling or engine misfires
  3. Reduced fuel efficiency
  4. Engine stalling
  5. Lack of power or acceleration

How to Fix P0279

  1. Begin by diagnosing the specific cause of the low voltage in the cylinder 7 injector control circuit using a diagnostic scanner and multimeter.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or poor connections. Repair or replace as needed.
  3. Test the fuel injector in cylinder 7 to ensure it is functioning properly. Replace if faulty.
  4. Check the fuel injector driver module and ECM for any malfunctions. Replace if necessary.
  5. Clear the trouble code from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0279

The typical repair costs for addressing a cylinder 7 injector control circuit low voltage issue can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates can range from $80 to $150 per hour, with higher rates in metropolitan areas or at dealerships, and lower rates at independent shops. For a more precise estimate, it's recommended to check local rates before proceeding with the repair.

What does this mean?

Tech Notes for P0279

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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Code P0279 Information for Specific Makes

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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