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P0303 2015 Chevrolet Silverado Code - Cylinder 3 Misfire Detected

Quick Answer

The P0303 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates that a misfire has been detected in cylinder 3 of the engine. Common causes include Faulty spark plug in cylinder 3, Failing ignition coil for cylinder 3, Clogged fuel injector for cylinder 3. 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
P0303 2015 Chevrolet Silverado indicates Cylinder 3 Misfire Detected.
Common causes
Common causes include Faulty spark plug in cylinder 3, Failing ignition coil for cylinder 3, Clogged fuel injector for cylinder 3.
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 P0303 2015 Chevrolet Silverado Description

The P0303 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates that a misfire has been detected in cylinder 3 of the engine. This means that the engine control module (ECM) has detected a lack of combustion in cylinder 3 during a specific engine cycle. Misfires can lead to a rough idle, decreased fuel efficiency, and potential damage to the catalytic converter over time. In the case of cylinder 3, the specific cylinder affected, the misfire could be caused by a variety of issues, including ignition problems, fuel delivery issues, or mechanical problems within the cylinder itself.

OBDII Code P0303 2015 Chevrolet Silverado - Cylinder 3 Misfire Detected
P0303 2015 Chevrolet Silverado Code - Cylinder 3 Misfire Detected

Common Causes of P0303 2015 Chevrolet Silverado

  1. Faulty spark plug in cylinder 3
  2. Failing ignition coil for cylinder 3
  3. Clogged fuel injector for cylinder 3
  4. Low compression in cylinder 3
  5. Vacuum leak affecting cylinder 3

Symptoms of P0303 2015 Chevrolet Silverado

  1. Rough idle or engine shaking
  2. Loss of power or acceleration
  3. Engine misfiring or hesitation
  4. Illuminated check engine light
  5. Increased fuel consumption

How to Fix P0303 2015 Chevrolet Silverado

  1. Perform a visual inspection of spark plugs, ignition coils, and wiring for cylinder 3. Replace any damaged components.
  2. Check fuel injector for cylinder 3 for proper operation and cleanliness. Clean or replace as needed.
  3. Perform a compression test on cylinder 3 to check for low compression. Repair any issues found.
  4. Verify that there are no vacuum leaks affecting cylinder 3 by conducting a smoke test or using a vacuum gauge.
  5. Clear the DTC with a scan tool after completing repairs and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0303 2015 Chevrolet Silverado

The cost estimate for resolving a P0303 code on a 2015 Chevrolet Silverado can vary depending on the specific cause of the misfire. Parts such as spark plugs, ignition coils, and fuel injectors can range from $50 to $200 each, with labor costs typically ranging from $100 to $300 for diagnosis and repair. Overall, the total repair cost for a cylinder 3 misfire could range from $150 to $800, including parts and labor. It's recommended to consult with a certified mechanic to get an accurate estimate based on the specific diagnosis and repair needed for your vehicle.

What does this mean?

Tech Notes for P0303 2015 Chevrolet Silverado

The P0303 code means that cylinder 3 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 3. 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 P0303

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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