AutoCodes – Toyota – P0306 2007 Toyota Highlander

P0306 2007 Toyota Highlander 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 2007 Toyota Highlander 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 7,739

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0306 2007 Toyota Highlander 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 2007 Toyota Highlander - Cylinder 6 Misfire Detected - AutoCodes.com — P0306 2007 Toyota Highlander Code - Cylinder 6 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0306 2007 Toyota Highlander?

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 2007 Toyota Highlander?

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 2007 Toyota Highlander 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 2007 Toyota Highlander code?

Need more information on how to fix the P0306 2007 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0306 2007 Toyota Highlander code diagnosed by a professional: Find a repair shop in your area

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 2007 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0306 in a 2007 Toyota Highlander?

- Common symptoms of code P0306 include engine misfires, rough idle, loss of power, and potential stalling.

2. What are the possible causes of a cylinder 6 misfire detected in a 2007 Toyota Highlander?

- The misfire in cylinder 6 can be caused by issues such as a faulty ignition coil, spark plug, fuel injector, vacuum leak, or low compression.

3. How can I diagnose the cylinder 6 misfire in my 2007 Toyota Highlander?

- Diagnosing the misfire involves checking the ignition system, fuel system, compression, and inspecting for any vacuum leaks using a scan tool and diagnostic procedures.

4. Can a dirty fuel injector cause OBDII code P0306 in a 2007 Toyota Highlander?

- Yes, a dirty or clogged fuel injector can lead to a misfire in cylinder 6, triggering code P0306 in the Toyota Highlander.

5. Is it safe to drive my 2007 Toyota Highlander with OBDII code P0306 present?

- It is not recommended to drive the vehicle with a misfire as it can cause damage to the catalytic converter. It's best to address the issue promptly.

6. How do I repair a cylinder 6 misfire in my 2007 Toyota Highlander?

- Depending on the cause, repairs may involve replacing the ignition coil, spark plug, fuel injector, addressing vacuum leaks, or performing a compression test.

7. Can a bad spark plug cause code P0306 in a 2007 Toyota Highlander?

- Yes, a faulty spark plug in cylinder 6 can lead to a misfire and trigger OBDII code P0306 in the Toyota Highlander.

8. How important is it to fix a cylinder 6 misfire in a timely manner?

- It's crucial to address the misfire promptly to prevent potential damage to the engine components and ensure optimal performance and fuel efficiency.

9. Will resetting the OBDII code P0306 in my 2007 Toyota Highlander make the issue go away?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the cylinder 6 misfire.

10. Can low fuel pressure contribute to OBDII code P0306 in a 2007 Toyota Highlander?

- Yes, low fuel pressure can affect the air-fuel mixture in cylinder 6, leading to a misfire detected and triggering code P0306 in the Toyota Highlander.