AutoCodes – Chevrolet – P0307 2018 Chevrolet Silverado

P0307 2018 Chevrolet Silverado Code - Cylinder 7 Misfire Detected

Quick Answer

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7. 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: P0307 2018 Chevrolet Silverado indicates Cylinder 7 Misfire Detected.
Common causes: Common causes include Faulty spark plug 7, Clogged or faulty fuel injector 7, Faulty ignition coil 7.
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 1,488

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 09, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0307 2018 Chevrolet Silverado 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 P0307 2018 Chevrolet Silverado - Cylinder 7 Misfire Detected - AutoCodes.com — P0307 2018 Chevrolet Silverado Code - Cylinder 7 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0307 2018 Chevrolet Silverado?

Faulty spark plug 7
Clogged or faulty fuel injector 7
Faulty ignition coil 7
Fuel injector 7 harness is open or shorted
Fuel injector 7 circuit poor electrical connection
Ignition coil 7 harness is open or shorted
Ignition coil 7 circuit poor electrical connection
Insufficient cylinder 7 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0307 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.

What does this mean?

Code Tech Notes

The P0307 code means that cylinder 7 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 7. 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 P0307
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 P0307 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 P0307 2018 Chevrolet Silverado code?

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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 P0307 2018 Chevrolet Silverado Code

What does the OBDII code P0307 mean on a 2018 Chevrolet Silverado?

P0307 indicates a misfire in cylinder number 7, meaning the engine isn't firing properly in that specific cylinder.

What are the symptoms of a P0307 code in a 2018 Chevrolet Silverado?

Common symptoms include rough idling, reduced engine performance, hesitation during acceleration, and potentially an illuminated check engine light.

What causes a P0307 code in a 2018 Chevrolet Silverado?

Possible causes include a faulty spark plug, bad ignition coil, clogged fuel injector, low compression in cylinder 7, or vacuum leaks near the cylinder.

Can I drive my 2018 Chevrolet Silverado with a P0307 code?

Driving with a misfire can cause further engine damage or catalytic converter issues. It's best to address the problem promptly.

How do I diagnose a P0307 code on a 2018 Chevrolet Silverado?

Start by inspecting spark plugs, ignition coils, and wires. If these are fine, check the fuel injector, cylinder compression, and vacuum system for issues.

How do I fix a P0307 code on a 2018 Chevrolet Silverado?

Repairs may involve replacing the spark plug, ignition coil, or fuel injector for cylinder 7. In some cases, engine repairs may be needed if compression is low.

Can a dirty air filter cause a P0307 code?

While a dirty air filter can affect engine performance, itâ€™s unlikely to specifically cause a misfire in cylinder 7.

How much does it cost to fix a P0307 code on a 2018 Chevrolet Silverado?

The cost depends on the issue. Replacing a spark plug or ignition coil may cost $100-$300, while more extensive repairs like fixing compression issues could cost significantly more.

Can a bad fuel injector cause a P0307 code?

Yes, a clogged or malfunctioning fuel injector for cylinder 7 can disrupt fuel delivery and cause a misfire.

Will resetting the check engine light fix a P0307 code?

Resetting the light without addressing the root cause will not fix the issue, and the code is likely to return. Proper diagnosis and repair are required.