P0304 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0304 2018 Chevrolet Silverado?
- 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 2018 Chevrolet Silverado?
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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?
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Frequently Asked Questions about P0304 2018 Chevrolet Silverado Code
1. What does the OBDII code P0304 mean on a 2018 Chevrolet Silverado?
P0304 indicates a misfire has been detected in cylinder 4 of the engine.
2. What are the symptoms of a P0304 code in a 2018 Chevrolet Silverado?
Common symptoms include rough idling, reduced engine performance, hesitation during acceleration, poor fuel economy, and the check engine light turning on.
3. What causes a P0304 code in a 2018 Chevrolet Silverado?
Possible causes include a faulty spark plug, ignition coil, fuel injector, low compression in cylinder 4, vacuum leaks, or an issue with the engine control module (ECM).
4. Can I drive my 2018 Chevrolet Silverado with a P0304 code?
Driving with a P0304 code is not recommended, as it can cause further engine damage or damage to the catalytic converter if the misfire is severe.
5. How do I diagnose a P0304 code on a 2018 Chevrolet Silverado?
Start by inspecting the spark plug, ignition coil, and wiring for cylinder 4. Perform a compression test, check for vacuum leaks, and test the fuel injector for proper operation.
6. How do I fix the P0304 code on a 2018 Chevrolet Silverado?
Common fixes include replacing the cylinder 4 spark plug or ignition coil, cleaning or replacing the fuel injector, repairing vacuum leaks, or addressing low cylinder compression issues.
7. How much does it cost to repair the P0304 code on a 2018 Chevrolet Silverado?
Repair costs vary depending on the issue. Replacing a spark plug or ignition coil could cost $100–$300, while more extensive repairs like fixing low compression may cost significantly more.
8. Can bad fuel cause a P0304 code in a 2018 Chevrolet Silverado?
Yes, contaminated or low-quality fuel can cause misfires, including in cylinder 4, leading to a P0304 code.
9. Will a dirty air filter trigger a P0304 code on a 2018 Chevrolet Silverado?
A dirty air filter is unlikely to directly cause a P0304 code but can contribute to poor engine performance, which might lead to misfires over time.
10. How do I reset the P0304 code on my 2018 Chevrolet Silverado after repairs?
You can reset the code by using an OBDII scanner to clear the check engine light or by disconnecting the battery for 10–15 minutes. Ensure the issue is fixed before resetting the code.
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