P0304 Chevrolet 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 Chevrolet 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.
Code P0304 Chevrolet Description
What are the Possible Causes of the DTC P0304 Chevrolet?
- 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 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.
Code Tech Notes
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 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 P0304 Chevrolet code?
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Need Help with the Code?
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Information for Specific Chevrolet Models
- P0304 2014 Chevrolet Silverado — Cylinder 4 Misfire Detected
- P0304 2015 Chevrolet Silverado — Cylinder 4 Misfire Detected
- P0304 2016 Chevrolet Silverado — Cylinder 4 Misfire Detected
- P0304 2017 Chevrolet Silverado — Cylinder 4 Misfire Detected
- P0304 2018 Chevrolet Silverado — Cylinder 4 Misfire Detected
Frequently Asked Questions about P0304 Chevrolet Code
1. What are the common symptoms of OBDII code P0304 (Cylinder 4 Misfire Detected) in a Chevrolet?
- Common symptoms of P0304 include rough idling, loss of power, engine vibration, and potential stalling.
2. What are some possible causes of a Cylinder 4 misfire in a Chevrolet triggering code P0304?
- Causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.
3. How can I diagnose the specific cause of a Cylinder 4 misfire in my Chevrolet triggering code P0304?
- Diagnose by checking spark plugs, ignition coils, fuel injectors, compression levels, vacuum leaks, and the engine control module for potential issues.
4. Can a dirty or clogged fuel injector cause a Cylinder 4 misfire in a Chevrolet resulting in code P0304?
- Yes, a dirty or clogged fuel injector can disrupt the air-fuel mixture in Cylinder 4, leading to a misfire and triggering code P0304.
5. Is it safe to drive my Chevrolet with OBDII code P0304 (Cylinder 4 Misfire Detected) present?
- It is not recommended to drive your Chevrolet with a misfire as it can cause further damage to the engine and affect overall performance.
6. Can a bad spark plug be the sole reason for OBDII code P0304 (Cylinder 4 Misfire Detected) in a Chevrolet?
- Yes, a bad spark plug in Cylinder 4 can cause a misfire and trigger code P0304, but it is essential to check other components as well.
7. How crucial is it to address OBDII code P0304 (Cylinder 4 Misfire Detected) promptly in a Chevrolet?
- It is important to address code P0304 promptly to prevent potential damage to the catalytic converter, engine components, and ensure optimal vehicle performance.
8. Are there any DIY repair tips for fixing OBDII code P0304 (Cylinder 4 Misfire Detected) in a Chevrolet?
- DIY repair tips may include checking and replacing spark plugs, ignition coils, and performing a compression test to identify and resolve the misfire issue.
9. Can a misfiring Cylinder 4 leading to code P0304 in a Chevrolet be related to a malfunctioning engine control module (ECM)?
- Yes, a malfunctioning ECM can potentially cause a misfire in Cylinder 4, triggering code P0304, so it's essential to diagnose the ECM along with other components.
10. How can I reset the OBDII code P0304 (Cylinder 4 Misfire Detected) after repairing the issue in my Chevrolet?
- You can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the stored fault code.
Discuss the causes and fixes for P0304 Chevrolet OBDII Code
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my 2014 silverado 5.3 keeps showing codes for water in fuel and # 4 misfire ,truck vibrates and engine light blinks,this hapened about 15 months ago had dealer replace fuel injector ,been putting techron fuel conditioner in light goes off for couple of days then comes back on and blinking intermitently,where does this water come from?will have to take back to dealer and will post what the diagnosis is when fixed.
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Interesting problem, if there was water in the fuel tank, the engine wont run at all. Please let us what they found.
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DROPPED OFF AT DEALER THIS MORNING ,THEY WILL DIAGNOSE TOMORROW SAID THEY HAVE BEEN REPLACING THROTTLE BODYS ON SOME OF THESE ,BUT NEED TO RUN TESTS FIRST, I WILL LET YOU KNOW WHAT THEY FIND ,# 4 MISFIRE CODE HAS BEEN COMING UP WITH LIGHT BLINKING WHEN GOING UP A GRADE OR HILL AND CAN FEEL ENGINE SHAKE.
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Chevrolet Dealer says they have to tear inside engine seems to be an internal problem on the right bank,wont know until friday hopefully what the process will be ,will keep posted.
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Wow. Major problem then. Hopefully you get your truck back like new soon.
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