AutoCodes – GMC – P0304 2017 GMC Sierra

P0304 2017 GMC Sierra Code - Cylinder 4 Misfire Detected

Quick Answer

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #4. 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: P0304 2017 GMC Sierra indicates Cylinder 4 Misfire Detected.
Common causes: Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #4.
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 396

How popular is this code, among other codes? Low

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 Aug 09, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0304 2017 GMC Sierra 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 P0304 2017 GMC Sierra - Cylinder 4 Misfire Detected - AutoCodes.com — P0304 2017 GMC Sierra Code - Cylinder 4 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2017 GMC Sierra?

Faulty Spark Plug #4
Clogged or faulty Fuel Injector #4
Faulty Ignition Coil #4
Fuel Injector #4 harness is open or shorted
Fuel Injector #4 circuit poor electrical connection
Ignition Coil #4 harness is open or shorted
Ignition Coil #4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0304 2017 GMC Sierra?

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 P0304 code means that cylinder 4 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 4. 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 P0304
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 P0304 2017 GMC Sierra 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.

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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.

Frequently Asked Questions about P0304 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P0304 (Cylinder 4 Misfire Detected) in a 2017 GMC Sierra?

- Common symptoms include rough idling, engine vibration, loss of power, and potential increase in fuel consumption.

2. What are the possible causes of a cylinder 4 misfire in a 2017 GMC Sierra triggering code P0304?

- Potential causes include faulty spark plugs or ignition coils, clogged fuel injectors, vacuum leaks, low compression, or issues with the fuel system.

3. How can I diagnose the source of the misfire related to code P0304 in cylinder 4 of my 2017 GMC Sierra?

- Diagnose by checking the spark plugs, ignition coils, fuel injectors, compression levels, and vacuum lines for any signs of wear, damage, or malfunction.

4. Is it safe to continue driving my 2017 GMC Sierra with OBDII code P0304 related to a cylinder 4 misfire?

- It is not recommended to drive the vehicle with a misfire as it can lead to more severe damage to the engine and other components.

5. Can a dirty air filter cause a cylinder 4 misfire in a 2017 GMC Sierra triggering code P0304?

- While a dirty air filter can affect engine performance, it is not a common direct cause of a cylinder misfire. Focus on ignition and fuel system components first.

6. Will resetting the OBDII code P0304 related to a cylinder 4 misfire in my 2017 GMC Sierra fix the issue?

- Resetting the code temporarily clears the Check Engine light but does not fix the underlying problem causing the misfire. Proper diagnosis and repair are needed.

7. How much does it typically cost to repair a cylinder 4 misfire triggering OBDII code P0304 in a 2017 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the misfire, but it may involve replacing spark plugs, ignition coils, fuel injectors, or addressing other issues.

8. Can bad gasoline quality cause a cylinder 4 misfire leading to OBDII code P0304 in a 2017 GMC Sierra?

- Poor-quality gasoline can potentially contribute to misfires, but it is more likely that the issue lies with the ignition or fuel delivery components.

9. Is it necessary to take my 2017 GMC Sierra to a mechanic for repairs when OBDII code P0304 appears for cylinder 4 misfire?

- While some DIY enthusiasts may attempt basic checks and repairs, it is often recommended to consult a mechanic for proper diagnosis and repair of the misfire issue.

10. How often should I perform maintenance checks to prevent cylinder misfires like the one causing OBDII code P0304 in my 2017 GMC Sierra?

- Regular maintenance checks, including inspecting spark plugs, ignition components, and the fuel system, can help prevent cylinder misfires. It's recommended to follow the manufacturer's maintenance schedule.