AutoCodes – Infiniti – P0306 Infiniti

P0306 Infiniti Code - Number 6 Cylinder 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 Infiniti indicates Number 6 Cylinder 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 26,197

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 Aug 09, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0306 Infiniti 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. The Diagnostic Trouble Code (DTC) will be set when the Engine Control Module monitors the crankshaft speed and has detected that engine cylinder #6 is misfiring.

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

What does this mean?

What are the Possible Causes of the DTC P0306 Infiniti?

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 Infiniti?

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 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 need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0306 Infiniti 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 P0306 Infiniti code?

Need more information on how to fix the P0306 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Infiniti Models

P0306 2003 Infiniti G35 — Number 6 Cylinder Misfire Detected
P0306 2004 Infiniti G35 — Number 6 Cylinder Misfire Detected
P0306 2005 Infiniti G35 — Number 6 Cylinder Misfire Detected
P0306 2006 Infiniti G35 — Number 6 Cylinder Misfire Detected

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 Infiniti Code

1. What are common symptoms of OBDII code P0306 in an Infiniti?

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

2. What are the possible causes of a number 6 cylinder misfire in an Infiniti?

- 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 a number 6 cylinder misfire in my Infiniti?

- Diagnostic steps may include checking spark plugs, inspecting ignition coils, testing fuel injectors, performing a compression test, and scanning the engine control module for codes.

4. Can a dirty fuel injector cause OBDII code P0306 in an Infiniti?

- Yes, a dirty or clogged fuel injector can cause a misfire in the number 6 cylinder, triggering OBDII code P0306.

5. Is it safe to continue driving with OBDII code P0306 in my Infiniti?

- It is not recommended to continue driving with a misfire as it can lead to further damage to the engine and other components. It is best to address the issue promptly.

6. How can I repair OBDII code P0306 in my Infiniti?

- Repair options may include replacing spark plugs, ignition coils, fuel injectors, fixing vacuum leaks, addressing compression issues, or reprogramming the engine control module.

7. Can a bad ignition coil cause OBDII code P0306 in an Infiniti?

- Yes, a faulty ignition coil for the number 6 cylinder can cause a misfire and trigger OBDII code P0306.

8. Will resetting the OBDII code P0306 in my Infiniti make the issue go away?

- Simply resetting the code will not fix the underlying issue causing the misfire. It is important to diagnose and repair the root cause of the problem.

9. How much does it typically cost to repair OBDII code P0306 in an Infiniti?

- The cost of repairs can vary depending on the cause of the misfire and the parts needed. It is advisable to consult with a mechanic for an accurate estimate.

10. Can a misfire in the number 6 cylinder affect the overall performance of my Infiniti?

- Yes, a misfire in one cylinder can lead to decreased performance, reduced fuel efficiency, and potential damage to the catalytic converter over time.