AutoCodes – Toyota – P0306 2009 Toyota Camry

P0306 2009 Toyota Camry Code - Cylinder 6 Misfire Detected

Quick Answer

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. 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 2009 Toyota Camry 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 3,001

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 2009 Toyota Camry Description

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases in exhaust emission levels. High concentrations of HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause damage to the TWC. To prevent these increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted as when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire rate exceeds the threshold level, and could cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

OBDII Code P0306 2009 Toyota Camry - Cylinder 6 Misfire Detected - AutoCodes.com — P0306 2009 Toyota Camry Code - Cylinder 6 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0306 2009 Toyota Camry?

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 2009 Toyota Camry?

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 2009 Toyota Camry 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 2009 Toyota Camry Code

1. What are the common symptoms of OBDII code P0306 in a 2009 Toyota Camry?

- Common symptoms include engine misfires, rough idling, loss of power, and potentially an illuminated check engine light.

2. What are the possible causes of a cylinder 6 misfire in a 2009 Toyota Camry?

- Possible causes can include faulty ignition coil, spark plug, fuel injector, vacuum leak, low compression, or issues with the engine's timing.

3. How can I diagnose the specific cause of the cylinder 6 misfire in my 2009 Toyota Camry?

- Diagnosing the issue may involve performing a compression test, inspecting spark plugs and ignition coils, checking fuel injectors, and looking for vacuum leaks.

4. Can driving with a misfiring cylinder 6 in my 2009 Toyota Camry cause further damage?

- Yes, driving with a misfire can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time.

5. How can I repair a cylinder 6 misfire detected in my 2009 Toyota Camry?

- Repairing the issue may involve replacing the faulty ignition coil, spark plug, fuel injector, or addressing any underlying mechanical issues causing the misfire.

6. Is it safe to continue driving my 2009 Toyota Camry with OBDII code P0306 (cylinder 6 misfire)?

- It is not recommended to drive with a misfire, as it can lead to further engine damage and potential safety hazards. It is best to address the issue promptly.

7. Can a dirty air filter cause a cylinder 6 misfire in a 2009 Toyota Camry?

- While a dirty air filter can affect engine performance, it is unlikely to directly cause a specific cylinder misfire. Focus on checking ignition and fuel components first.

8. How much does it typically cost to repair a cylinder 6 misfire in a 2009 Toyota Camry?

- The cost of repair can vary depending on the specific cause of the misfire, but it may range from a few hundred dollars to over a thousand dollars for more complex issues.

9. Will resetting the check engine light make the cylinder 6 misfire in my 2009 Toyota Camry go away?

- Resetting the check engine light without addressing the underlying issue will not fix the misfire problem. It is important to diagnose and repair the root cause.

10. Can bad gasoline quality contribute to a cylinder 6 misfire in a 2009 Toyota Camry?

- Poor quality gasoline can potentially cause misfires, but it is less common than issues with ignition, fuel delivery, or engine mechanical components.