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Engine-Codes – GMC – P0302 2014 GMC Sierra

P0302 2014 GMC Sierra Code - Cylinder 2 Misfire Detected

Quick Answer

The diagnostic trouble code P0302 for a 2014 GMC Sierra indicates that a misfire has been detected in cylinder 2 of the engine. Common causes include Faulty spark plugs, Failing ignition coils, Clogged or malfunctioning fuel injectors. 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
P0302 2014 GMC Sierra indicates Cylinder 2 Misfire Detected.
Common causes
Common causes include Faulty spark plugs, Failing ignition coils, Clogged or malfunctioning fuel injectors.
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 07, 2024
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Code P0302 2014 GMC Sierra Description

The diagnostic trouble code P0302 for a 2014 GMC Sierra indicates that a misfire has been detected in cylinder 2 of the engine. A misfire occurs when the air-fuel mixture in the combustion chamber fails to ignite at the proper time, resulting in a lack of power, rough idling, and potentially increased emissions. In this case, cylinder 2 is specifically experiencing this issue, which can lead to a variety of performance problems for the vehicle.

OBDII Code P0302 2014 GMC Sierra - Cylinder 2 Misfire Detected
P0302 2014 GMC Sierra Code - Cylinder 2 Misfire Detected

Common Causes of P0302 2014 GMC Sierra

  1. Faulty spark plugs
  2. Failing ignition coils
  3. Clogged or malfunctioning fuel injectors
  4. Vacuum leaks in the intake system
  5. Low compression in cylinder 2

Symptoms of P0302 2014 GMC Sierra

  1. Loss of power
  2. Rough idling or vibrations
  3. Engine misfires or hesitation during acceleration
  4. Decreased fuel efficiency
  5. Check Engine Light illuminated

How to Fix P0302 2014 GMC Sierra

  1. Begin by diagnosing the root cause of the misfire, such as checking the spark plugs, ignition coils, and fuel injectors for proper function.
  2. Replace any faulty components such as spark plugs, ignition coils, or fuel injectors in cylinder 2.
  3. Inspect the intake system for any vacuum leaks and repair as necessary.
  4. Perform a compression test on cylinder 2 to check for any internal engine issues that may be causing the misfire.
  5. Clear the diagnostic trouble code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0302 2014 GMC Sierra

The cost of repairing a cylinder 2 misfire in a 2014 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. Generally, the cost of replacing spark plugs, ignition coils, or fuel injectors can range from $100 to $500 per component, not including labor costs. The total repair cost could range from $200 to $1000 or more, depending on the extent of the repairs needed. It is recommended to consult with a trusted mechanic or dealership to get an accurate estimate based on the specific diagnosis and repair plan for your vehicle.

What does this mean?

Tech Notes for P0302 2014 GMC Sierra

The P0302 code means that cylinder 2 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 2. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

There is a Factory Service Bulletins for All 2000-2020 Chevrolet Models:
2000-2020 Chevrolet Factory Service Bulletin OBDII Code P0302
This Factory Service Bulletin explains how this condition may be caused by significant carbon build-up on the intake and/or exhaust valves due to fuel contamination or incomplete burning of the fuel.

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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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