AutoCodes – Chevrolet – P0302 Chevrolet

P0302 Chevrolet Code - Cylinder 2 Misfire Detected

Quick Answer

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #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 Chevrolet indicates Cylinder 2 Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #2, Clogged or faulty Fuel Injector #2, Faulty Ignition Coil #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.

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Code Popularity 85,996

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 21, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0302 Chevrolet Description

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. The Engine Control Module (ECM) can detect these variations by closely monitoring the crankshaft position sensor signal. The signals of the camshaft position sensors are used to determine which cylinder is misfiring. If the ECM detects a misfire rate sufficient to cause emission levels to exceed mandated standards, the Diagnostic Trouble Code (DTC) will be set. Under certain driving conditions, a misfire rate can be high enough to cause the catalytic converter to overheat, damaging the converter. The Malfunction Indicator Lamp (MIL) flashes when the converter is overheating, damaging conditions are present, and the DTC is set. The DTC will be set when the ECM detects a crankshaft rotation speed variation indicating a single-cylinder misfire rate sufficient to cause emissions levels to exceed mandated standards.

OBDII Code P0302 Chevrolet - Cylinder 2 Misfire Detected - AutoCodes.com — P0302 Chevrolet Code - Cylinder 2 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 Chevrolet?

Faulty Spark Plug #2
Clogged or faulty Fuel Injector #2
Faulty Ignition Coil #2
Fuel Injector #2 harness is open or shorted
Fuel Injector #2 circuit poor electrical connection
Ignition Coil #2 harness is open or shorted
Ignition Coil #2 circuit poor electrical connection
Insufficient cylinder 2 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0302 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0302 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0302 Chevrolet code?

Need more information on how to fix the P0302 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0302 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P0302 2014 Chevrolet Silverado — Cylinder 2 Misfire Detected
P0302 2015 Chevrolet Silverado — Cylinder 2 Misfire Detected
P0302 2016 Chevrolet Silverado — Cylinder 2 Misfire Detected
P0302 2017 Chevrolet Silverado — Cylinder 2 Misfire Detected
P0302 2018 Chevrolet Silverado — Cylinder 2 Misfire Detected

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.

Frequently Asked Questions about P0302 Chevrolet Code

1. What are the common symptoms of OBDII code P0302 (Cylinder 2 Misfire Detected) in a Chevrolet?

- Common symptoms include rough idling, loss of power, engine vibrations, and potential engine stalling.

2. What are the possible causes of a cylinder 2 misfire in a Chevrolet triggering code P0302?

- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine's computer system.

3. How can I diagnose the cause of a cylinder 2 misfire in my Chevrolet triggering code P0302?

- Diagnostic steps may include checking spark plugs, ignition coils, fuel injectors, compression levels, vacuum leaks, and using a scan tool to monitor live engine data.

4. Can a dirty or clogged fuel injector cause a cylinder 2 misfire triggering code P0302 in a Chevrolet?

- Yes, a dirty or clogged fuel injector can disrupt the proper fuel delivery to the cylinder, leading to a misfire and triggering the P0302 code.

5. Is it safe to continue driving my Chevrolet with OBDII code P0302 (Cylinder 2 Misfire Detected)?

- It is not recommended to drive your vehicle with a misfire issue as it can cause damage to the catalytic converter and other engine components over time.

6. How can I repair a cylinder 2 misfire in my Chevrolet to resolve OBDII code P0302?

- Repair steps may involve replacing spark plugs, ignition coils, fuel injectors, performing a compression test, fixing vacuum leaks, or addressing issues with the engine's computer system.

7. Will resetting the OBDII code P0302 in my Chevrolet make the issue go away?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing the cylinder 2 misfire.

8. Can extreme weather conditions contribute to triggering OBDII code P0302 in a Chevrolet?

- Yes, extreme cold or hot weather can impact engine performance and potentially lead to misfires, including the cylinder 2 misfire detected by code P0302.

9. How often should I perform maintenance to prevent OBDII code P0302 (Cylinder 2 Misfire Detected) in my Chevrolet?

- Regular maintenance, including spark plug replacements, checking ignition components, and monitoring fuel system health, can help prevent misfire issues and code P0302 from occurring.

10. Will using poor-quality fuel impact the likelihood of OBDII code P0302 (Cylinder 2 Misfire Detected) in a Chevrolet?

- Poor-quality fuel with contaminants or improper octane levels can affect combustion and potentially lead to misfires, including the cylinder 2 misfire triggering code P0302.