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P0307 2015 GMC Sierra Code - Cylinder 7 Misfire Detected

Quick Answer

The P0307 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that a misfire has been detected in cylinder 7 of the engine. Common causes include Faulty spark plug in cylinder 7, Failing ignition coil in cylinder 7, Clogged fuel injector for cylinder 7. 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
P0307 2015 GMC Sierra indicates Cylinder 7 Misfire Detected.
Common causes
Common causes include Faulty spark plug in cylinder 7, Failing ignition coil in cylinder 7, Clogged fuel injector for cylinder 7.
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 09, 2024
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Code P0307 2015 GMC Sierra Description

The P0307 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that a misfire has been detected in cylinder 7 of the engine. A misfire occurs when the combustion process in the cylinder does not happen correctly, leading to a lack of power, rough idle, and potentially engine damage if left unresolved. In this case, cylinder 7 is specifically identified as the source of the misfire, which can help pinpoint the issue for more accurate diagnosis and repair.

OBDII Code P0307 2015 GMC Sierra - Cylinder 7 Misfire Detected
P0307 2015 GMC Sierra Code - Cylinder 7 Misfire Detected

Common Causes of P0307 2015 GMC Sierra

  1. Faulty spark plug in cylinder 7.
  2. Failing ignition coil in cylinder 7.
  3. Clogged fuel injector for cylinder 7.
  4. Vacuum leak affecting cylinder 7.
  5. Low compression in cylinder 7 due to worn piston rings or valves.

Symptoms of P0307 2015 GMC Sierra

  1. Rough idle or shaking sensation while the engine is running.
  2. Decreased acceleration and power output.
  3. Check engine light illuminated on the dashboard.
  4. Increased fuel consumption.
  5. Engine may emit unusual noises or vibrations when misfiring.

How to Fix P0307 2015 GMC Sierra

  1. Begin by diagnosing the specific cause of the misfire in cylinder 7 using a scan tool to check for related DTCs and performing a cylinder balance test.
  2. Inspect the spark plug in cylinder 7 for signs of wear or fouling and replace if necessary.
  3. Test the ignition coil in cylinder 7 for proper function and replace if defective.
  4. Clean or replace the fuel injector for cylinder 7 to ensure proper fuel delivery.
  5. Check for vacuum leaks in the intake manifold or vacuum lines connected to cylinder 7 and repair as needed.

Cost to Fix P0307 2015 GMC Sierra

The cost of repairing a misfire in cylinder 7 of a 2015 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Generally, the cost of parts such as spark plugs, ignition coils, or fuel injectors can range from $50 to $200 per component. Labor rates at auto repair shops typically fall between $80 and $150 per hour, with the overall repair cost likely totaling between $150 and $500. Keep in mind that additional diagnostic time or parts may be necessary, so it's recommended to consult with a professional mechanic for a more accurate estimate.

What does this mean?

Tech Notes for P0307 2015 GMC Sierra

The P0307 code means that cylinder 7 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 7. 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 P0307

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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