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Engine-Codes – GMC – P0303 2016 GMC Sierra

P0303 2016 GMC Sierra Code - Cylinder 3 Misfire Detected

Quick Answer

The P0303 code for a 2016 GMC Sierra indicates that there is a misfire detected in cylinder 3 of the engine. Common causes include Worn or fouled spark plugs, Faulty ignition coil in cylinder 3, Clogged or malfunctioning fuel injector in 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 2016 GMC Sierra indicates Cylinder 3 Misfire Detected.
Common causes
Common causes include Worn or fouled spark plugs, Faulty ignition coil in cylinder 3, Clogged or malfunctioning fuel injector in 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 2016 GMC Sierra Description

The P0303 code for a 2016 GMC Sierra indicates that there is a misfire detected in cylinder 3 of the engine. This means that the fuel-air mixture in the combustion chamber of cylinder 3 is not igniting properly, causing a disruption in the smooth operation of the engine. A misfire can lead to a decrease in engine performance, reduced fuel efficiency, rough idling, and potentially even engine damage if left unresolved.

OBDII Code P0303 2016 GMC Sierra - Cylinder 3 Misfire Detected
P0303 2016 GMC Sierra Code - Cylinder 3 Misfire Detected

Common Causes of P0303 2016 GMC Sierra

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

Symptoms of P0303 2016 GMC Sierra

  1. Check engine light illumination
  2. Rough idling or vibrations when the engine is running
  3. Decreased fuel efficiency
  4. Loss of power or hesitation during acceleration
  5. Engine misfires or stalling

How to Fix P0303 2016 GMC Sierra

  1. Start by diagnosing the specific cause of the misfire in cylinder 3, such as checking the spark plugs, ignition coil, fuel injector, and compression levels.
  2. Replace any faulty components identified during the diagnostic process, such as installing new spark plugs or ignition coil in cylinder 3.
  3. Clean or replace clogged fuel injectors in cylinder 3 if necessary.
  4. Address any vacuum leaks in the intake system that may be affecting cylinder 3.
  5. Perform a compression test on cylinder 3 to ensure proper engine operation and address any issues found.

Cost to Fix P0303 2016 GMC Sierra

The cost of repairing a cylinder misfire in a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacement spark plugs can cost between $10-30 each, while an ignition coil may range from $50-200. Fuel injector cleaning or replacement can range from $50-300 per injector. Additionally, the cost of labor for diagnosis and repair can range from $200-500. Overall, you may expect to pay anywhere from $300 to $1000 to resolve a cylinder misfire in your vehicle. It is advisable to consult with a local auto repair shop for a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0303 2016 GMC Sierra

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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