AutoCodes – KIA – P0306 KIA

P0306 KIA Code - Cylinder 6 Misfire Detected

Quick Answer

When a misfire occurs, engine speed will fluctuate. Common causes include Faulty spark plug 6, Clogged or faulty fuel injector 6, Faulty ignition coil 6. 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: P0306 KIA indicates Cylinder 6 Misfire Detected.
Common causes: Common causes include Faulty spark plug 6, Clogged or faulty fuel injector 6, Faulty ignition coil 6.
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 21,931

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0306 KIA Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

OBDII Code P0306 KIA - Cylinder 6 Misfire Detected - AutoCodes.com — P0306 KIA Code - Cylinder 6 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0306 KIA?

Faulty spark plug 6
Clogged or faulty fuel injector 6
Faulty ignition coil 6
Fuel injector 6 harness is open or shorted
Fuel injector 6 circuit poor electrical connection
Ignition coil 6 harness is open or shorted
Ignition coil 6 circuit poor electrical connection
Insufficient cylinder 6 compression
Incorrect fuel pressure
Intake air leak

How to Fix the DTC P0306 KIA?

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 P0306 code means that the cylinder 6 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 6. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0306 KIA 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 P0306 KIA Code

1. What are the common symptoms of OBDII code P0306 in a KIA, indicating Cylinder 6 misfire detected?

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

2. What are the possible causes of OBDII code P0306 in a KIA?

- Possible causes 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 cause of OBDII code P0306 in my KIA?

- Diagnosis typically involves inspecting and testing spark plugs, ignition coils, fuel injectors, vacuum lines, compression levels, and scanning for any other related trouble codes.

4. Can driving with OBDII code P0306 in a KIA cause further damage to the vehicle?

- Continuing to drive with a misfire can potentially damage the catalytic converter, oxygen sensors, and other engine components over time. It is recommended to address the issue promptly.

5. How can I repair OBDII code P0306 in my KIA?

- Repair involves addressing the root cause of the misfire, which may include replacing faulty spark plugs, ignition coils, fuel injectors, repairing vacuum leaks, or performing engine compression tests.

6. Are there any maintenance tips to prevent OBDII code P0306 from occurring in my KIA?

- Regular maintenance, such as changing spark plugs at recommended intervals, using quality fuel, and addressing any engine performance issues promptly, can help prevent misfires.

7. Is it safe to drive my KIA with a flashing check engine light and OBDII code P0306?

- A flashing check engine light indicates a severe misfire that can cause damage to the catalytic converter. It is recommended to pull over safely and have the vehicle towed for repairs.

8. How much does it typically cost to repair OBDII code P0306 in a KIA?

- Repair costs can vary depending on the root cause of the misfire and labor rates. It is advisable to consult a mechanic or dealership for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P0306 in a KIA?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address simple causes of the misfire, such as replacing spark plugs. However, more complex issues may require professional diagnosis and repair.

10. Will resetting the OBDII code P0306 in my KIA make the issue go away?

- Resetting the code will clear the check engine light temporarily, but if the underlying issue causing the misfire is not addressed, the code is likely to return. It is crucial to diagnose and repair the problem to prevent further issues.