AutoCodes – Chevrolet – P0308 2014 Chevrolet Silverado

P0308 2014 Chevrolet Silverado Code - Cylinder 8 Misfire Detected

Quick Answer

A misfiring cylinder causes slight variations in the rotational speed of the crankshaft. Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8. 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: P0308 2014 Chevrolet Silverado indicates Cylinder 8 Misfire Detected.
Common causes: Common causes include Faulty spark plug 8, Clogged or faulty fuel injector 8, Faulty ignition coil 8.
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 2,238

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 P0308 2014 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 P0308 2014 Chevrolet Silverado - Cylinder 8 Misfire Detected - AutoCodes.com — P0308 2014 Chevrolet Silverado Code - Cylinder 8 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0308 2014 Chevrolet Silverado?

Faulty spark plug 8
Clogged or faulty fuel injector 8
Faulty ignition coil 8
Fuel injector 8 harness is open or shorted
Fuel injector 8 circuit poor electrical connection
Ignition coil 8 harness is open or shorted
Ignition coil 8 circuit poor electrical connection
Insufficient cylinder 8 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0308 2014 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 P0308 code means that cylinder 8 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 8. 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 P0308
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 P0308 2014 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 P0308 2014 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 P0308 2014 Chevrolet Silverado Code

1. What does the OBDII code P0308 mean on a 2014 Chevrolet Silverado?

P0308 indicates a misfire has been detected in cylinder 8 of the engine.

2. What are the common symptoms of a P0308 code in a 2014 Chevrolet Silverado?

Symptoms may include rough idling, reduced engine power, poor fuel economy, engine hesitation, and the check engine light illuminating.

3. What are the potential causes of a P0308 code in a 2014 Chevrolet Silverado?

Common causes include a faulty spark plug, a bad ignition coil, a clogged fuel injector, low cylinder compression, or a vacuum leak affecting cylinder 8.

4. Can a dirty fuel injector cause a P0308 code?

Yes, a clogged or malfunctioning fuel injector in cylinder 8 can disrupt fuel delivery and trigger a misfire.

5. How can I diagnose a P0308 code on my 2014 Chevrolet Silverado?

Start by inspecting the spark plug, ignition coil, and fuel injector for cylinder 8. You may also want to perform a compression test and check for vacuum leaks.

6. Can I drive my 2014 Chevrolet Silverado with a P0308 code?

Driving with a P0308 code is not recommended, as it can lead to further engine damage or catalytic converter failure if the issue is not resolved.

7. How is a P0308 code typically repaired?

Repairs may include replacing the spark plug or ignition coil for cylinder 8, cleaning or replacing the fuel injector, fixing vacuum leaks, or addressing engine compression issues.

8. Can a bad ignition coil cause a P0308 code?

Yes, a failing ignition coil for cylinder 8 can prevent proper spark delivery, leading to a misfire.

9. How much does it cost to fix a P0308 code on a 2014 Chevrolet Silverado?

Repair costs vary depending on the cause but could range from $50 for a spark plug replacement to several hundred dollars for more extensive repairs like addressing compression issues.

10. Will replacing the spark plug in cylinder 8 fix a P0308 code?

If the misfire is due to a worn or damaged spark plug, replacing it should resolve the P0308 code. However, additional diagnostics are recommended to ensure no other components are at fault.