AutoCodes – Volvo – P0306 Volvo

P0306 Volvo 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 Volvo 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 19,830

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 Volvo 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 Volvo - Cylinder 6 Misfire Detected - AutoCodes.com — P0306 Volvo Code - Cylinder 6 Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0306 Volvo?

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 Volvo?

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 Volvo 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 Volvo Code

1. What are the common symptoms of OBDII code P0306 in a Volvo?

- Common symptoms include engine misfires, rough idling, loss of power, and increased fuel consumption.

2. What are the possible causes of a cylinder 6 misfire detected in a Volvo?

- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression in the cylinder, or a problem with the engine control module.

3. How can I diagnose the cause of the cylinder 6 misfire in my Volvo?

- Diagnose by checking the spark plugs, ignition coils, fuel injectors, vacuum lines, and performing a compression test on cylinder 6. Additionally, scan for any other related trouble codes.

4. Can driving with a misfiring cylinder 6 in my Volvo cause further damage?

- Yes, driving with a misfire can lead to damage to the catalytic converter, oxygen sensors, and other engine components. It is recommended to address the issue promptly.

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

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

6. Is it safe to continue driving my Volvo with a cylinder 6 misfire?

- It is not recommended to drive your Volvo with a misfire, as it can cause further damage to the engine and emissions system. Have the issue diagnosed and repaired promptly.

7. Will resetting the check engine light resolve the cylinder 6 misfire issue in my Volvo?

- Resetting the check engine light may temporarily clear the code, but the underlying issue causing the misfire will still need to be diagnosed and repaired to prevent future occurrences.

8. Can bad fuel quality or a clogged fuel filter cause a cylinder 6 misfire in my Volvo?

- Yes, bad fuel quality or a clogged fuel filter can disrupt the fuel delivery to cylinder 6, leading to a misfire. Consider checking and replacing the fuel filter if necessary.

9. How often should I replace the spark plugs in my Volvo to prevent cylinder misfires?

- It is recommended to follow the manufacturer's recommended maintenance schedule for spark plug replacement, typically every 30,000 to 100,000 miles depending on the type of spark plugs used.

10. Can extreme weather conditions contribute to a cylinder 6 misfire in my Volvo?

- Extreme weather conditions, such as very cold or hot temperatures, can affect the performance of ignition components and fuel delivery, potentially leading to a cylinder misfire.