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P0306 2018 Chevrolet Silverado Code - Cylinder 6 Misfire Detected

Quick Answer

The diagnostic trouble code (DTC) P0306 for a 2018 Chevrolet Silverado indicates that a misfire has been detected in cylinder 6 of the engine. Common causes include Worn or fouled spark plugs, Faulty ignition coil in cylinder 6, Clogged or malfunctioning fuel injector. 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
P0306 2018 Chevrolet Silverado indicates Cylinder 6 Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil in cylinder 6, Clogged or malfunctioning fuel injector.
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 11, 2024
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Code P0306 2018 Chevrolet Silverado Description

The diagnostic trouble code (DTC) P0306 for a 2018 Chevrolet Silverado indicates that a misfire has been detected in cylinder 6 of the engine. A misfire occurs when the fuel-air mixture in the combustion chamber fails to ignite at the proper time, resulting in a loss of power, rough idle, and potential damage to the engine components. In this case, cylinder 6 is specifically experiencing this issue, which can lead to a variety of performance problems if left unaddressed.

OBDII Code P0306 2018 Chevrolet Silverado - Cylinder 6 Misfire Detected
P0306 2018 Chevrolet Silverado Code - Cylinder 6 Misfire Detected

Common Causes of P0306 2018 Chevrolet Silverado

  1. Worn or fouled spark plugs.
  2. Faulty ignition coil in cylinder 6.
  3. Clogged or malfunctioning fuel injector.
  4. Vacuum leaks in the intake manifold.
  5. Low compression in cylinder 6.

Symptoms of P0306 2018 Chevrolet Silverado

  1. Rough idle or vibrations felt while the vehicle is stationary.
  2. Loss of power or acceleration during driving.
  3. Engine misfires or hesitation when accelerating.
  4. Increased fuel consumption.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P0306 2018 Chevrolet Silverado

  1. Begin by diagnosing the specific cause of the misfire using a scan tool to identify the cylinder 6 misfire code.
  2. Inspect and replace the spark plugs and ignition coils in cylinder 6 if they are worn or faulty.
  3. Clean or replace the fuel injector for cylinder 6 to ensure proper fuel delivery.
  4. Check for vacuum leaks in the intake manifold and repair as needed.
  5. Perform a compression test on cylinder 6 to verify proper compression levels and address any issues found.

Cost to Fix P0306 2018 Chevrolet Silverado

The cost estimate for repairing a cylinder 6 misfire in a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. On average, the parts required for this repair, such as spark plugs, ignition coils, and fuel injectors, can range from $100 to $300. Labor costs typically range from $150 to $300, with total repair costs falling between $250 and $600. It's important to note that diagnosis time and labor rates can vary based on location and the repair shop chosen, so it's advisable to obtain quotes from multiple sources for a more accurate estimate.

What does this mean?

Tech Notes for P0306 2018 Chevrolet Silverado

The P0306 code means that cylinder 6 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 6. 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 P0306

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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