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P0302 2018 Chevrolet Silverado Code - Cylinder 2 Misfire Detected

Quick Answer

The diagnostic trouble code P0302 for a 2018 Chevrolet Silverado indicates that the engine's computer has detected a misfire in cylinder 2. Common causes include Faulty spark plug in cylinder 2, Failing ignition coil in cylinder 2, Clogged fuel injector for cylinder 2. 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 2018 Chevrolet Silverado indicates Cylinder 2 Misfire Detected.
Common causes
Common causes include Faulty spark plug in cylinder 2, Failing ignition coil in cylinder 2, Clogged fuel injector for cylinder 2.
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 06, 2024
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Code P0302 2018 Chevrolet Silverado Description

The diagnostic trouble code P0302 for a 2018 Chevrolet Silverado indicates that the engine's computer has detected a misfire in cylinder 2. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite properly, resulting in a lack of power, rough idling, and potentially damaging vibrations. In this case, cylinder 2 is specifically affected, which means that the misfire is isolated to that particular cylinder. This issue can lead to decreased engine performance, reduced fuel efficiency, and increased emissions.

OBDII Code P0302 2018 Chevrolet Silverado - Cylinder 2 Misfire Detected
P0302 2018 Chevrolet Silverado Code - Cylinder 2 Misfire Detected

Common Causes of P0302 2018 Chevrolet Silverado

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

Symptoms of P0302 2018 Chevrolet Silverado

  1. Rough idling or shaking engine
  2. Loss of power or acceleration
  3. Check engine light illuminated
  4. Engine stalling or hesitation
  5. Increased fuel consumption

How to Fix P0302 2018 Chevrolet Silverado

  1. Start by performing a visual inspection of the ignition system components for cylinder 2, including the spark plug, ignition coil, and wires. Replace any faulty parts as needed.
  2. Check the fuel injector for cylinder 2 to ensure it is clean and functioning correctly. Clean or replace the injector if necessary.
  3. Conduct a compression test on cylinder 2 to determine if there are any issues with the engine's internal components. Repair or replace any parts contributing to low compression.
  4. Use a diagnostic tool to check for any ECM codes related to cylinder 2 misfire and address any underlying electronic issues.
  5. After making the necessary repairs, clear the diagnostic trouble codes from the engine control module and test drive the vehicle to ensure the misfire has been resolved.

Cost to Fix P0302 2018 Chevrolet Silverado

The typical repair costs for resolving a cylinder 2 misfire in a 2018 Chevrolet Silverado can range from $100 to $500, depending on the specific cause of the issue and the parts required for the repair. This estimate includes the cost of diagnostic testing, replacement parts, and labor. Keep in mind that prices may vary based on location, the severity of the problem, and the repair shop's rates. It's advisable to consult with a trusted mechanic or dealership to obtain a more accurate estimate for your specific situation.

What does this mean?

Tech Notes for P0302 2018 Chevrolet Silverado

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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