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Engine-Codes – GMC – P0280 2015 GMC Sierra

P0280 2015 GMC Sierra Code - Cylinder 7 Injector Control Circuit High Voltage

Quick Answer

The P0280 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Cylinder 7 Injector Control Circuit High Voltage. Common causes include Faulty fuel injector in cylinder 7, Short or open circuit in the injector control wiring, Malfunctioning PCM. 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
P0280 2015 GMC Sierra indicates Cylinder 7 Injector Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector in cylinder 7, Short or open circuit in the injector control wiring, Malfunctioning PCM.
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 P0280 2015 GMC Sierra Description

The P0280 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Cylinder 7 Injector Control Circuit High Voltage. This means that the powertrain control module (PCM) has detected that the voltage in the control circuit for the fuel injector in cylinder 7 is higher than normal. The fuel injector control circuit is responsible for delivering the precise amount of fuel to the corresponding cylinder for combustion. When the voltage in this circuit is too high, it can lead to improper fuel delivery, affecting the engine's performance and efficiency.

OBDII Code P0280 2015 GMC Sierra - Cylinder 7 Injector Control Circuit High Voltage
P0280 2015 GMC Sierra Code - Cylinder 7 Injector Control Circuit High Voltage

Common Causes of P0280 2015 GMC Sierra

  1. Faulty fuel injector in cylinder 7
  2. Short or open circuit in the injector control wiring
  3. Malfunctioning PCM
  4. Issue with the fuel injector driver within the PCM
  5. Corrosion or damage to the injector control circuit

Symptoms of P0280 2015 GMC Sierra

  1. Rough idling or engine misfires
  2. Decreased fuel efficiency
  3. Engine hesitation or stalling
  4. Check engine light illuminated
  5. Increased emissions

How to Fix P0280 2015 GMC Sierra

  1. Begin by performing a thorough inspection of the injector control circuit, including the wiring and connectors, to check for any visible damage or corrosion.
  2. Test the fuel injector in cylinder 7 to determine if it is functioning properly. If necessary, replace the faulty injector.
  3. Use a multimeter to check the voltage in the injector control circuit and diagnose any abnormalities.
  4. Inspect the PCM and fuel injector driver for any signs of malfunction. Replace or repair as needed.
  5. Clear the DTC from the PCM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0280 2015 GMC Sierra

The typical repair costs for addressing a Cylinder 7 Injector Control Circuit High Voltage issue can vary depending on the specific cause of the problem. In general, the cost of replacing a fuel injector can range from $150 to $300 per injector, not including labor. Additional costs may include diagnostic fees, wiring repairs, or PCM replacement, which can increase the total repair bill. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates can vary based on location and shop type. It is advisable to consult with a trusted mechanic or dealership for a more accurate cost estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P0280 2015 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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