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P0308 Ford Code - Cylinder 8 Misfire Detected

Quick Answer

The diagnostic trouble code (DTC) P0308 for Ford vehicles indicates that a misfire has been detected in cylinder 8 of the engine. Common causes include Faulty spark plug in cylinder 8, Malfunctioning ignition coil, Clogged or faulty fuel injector. 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
P0308 Ford indicates Cylinder 8 Misfire Detected.
Common causes
Common causes include Faulty spark plug in cylinder 8, Malfunctioning ignition coil, Clogged or faulty fuel injector.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0308 Ford Description

The diagnostic trouble code (DTC) P0308 for Ford vehicles indicates that a misfire has been detected in cylinder 8 of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite properly, leading to a disruption in the combustion process. This can result in a loss of power, rough idling, decreased fuel efficiency, and increased emissions.

OBDII Code P0308 Ford - Cylinder 8 Misfire Detected
P0308 Ford Code - Cylinder 8 Misfire Detected

Common Causes of P0308 Ford

  1. Faulty spark plug in cylinder 8
  2. Malfunctioning ignition coil
  3. Clogged or faulty fuel injector
  4. Wiring issues in the ignition system
  5. Vacuum leaks affecting cylinder 8

Symptoms of P0308 Ford

  1. Rough idling
  2. Loss of power
  3. Engine hesitation during acceleration
  4. Increased fuel consumption
  5. Check Engine Light illuminated

How to Fix P0308 Ford

  1. Diagnose the specific cause of the misfire in cylinder 8 using a diagnostic scanner.
  2. Inspect and replace the spark plug in cylinder 8 if it is found to be faulty.
  3. Test the ignition coil in cylinder 8 and replace if necessary.
  4. Check the fuel injector in cylinder 8 for clogs or malfunctions and clean or replace as needed.
  5. Inspect the wiring in the ignition system for any damage or loose connections and repair as necessary.

Cost to Fix P0308 Ford

The cost of repairing a cylinder 8 misfire in a Ford vehicle can vary depending on the specific cause of the issue. On average, the cost can range from $100 to $500 for parts and labor. However, the total repair cost can be higher if additional components need to be replaced or if there are underlying engine problems that need to be addressed. It is recommended to obtain quotes from local auto repair shops to get a more accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0308 Ford

The P0308 code means that cylinder #8 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 #8. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

There is a Factory Service Bulletin for the 2011 Ford Mustang:
2011 Ford Mustang Factory Service Bulletin OBDII Code P0308
The Factory Service Bulletin recommends reprogramming the Powertrain Control Module (PCM) to resolve the problem.





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Information for Specific Ford Models

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 P0308 Ford Code

1. What are the common symptoms of OBDII code P0308 in a Ford, indicating a Cylinder 8 misfire detected?

The common symptoms include engine vibration, loss of power, rough idle, and potential stalling.

2. What are some possible causes of OBDII code P0308 in a Ford, signaling a Cylinder 8 misfire?

Potential causes may include faulty spark plugs, a malfunctioning ignition coil, low compression in cylinder 8, or a vacuum leak.

3. How can I diagnose the cause of OBDII code P0308 in a Ford related to a Cylinder 8 misfire?

You can perform a thorough inspection of the spark plugs, ignition coil, and compression in cylinder 8, as well as check for any vacuum leaks in the system.

4. What are some essential repair tips for addressing OBDII code P0308 in a Ford due to a Cylinder 8 misfire?

Ensure proper spark plug replacement, test and potentially replace the ignition coil, conduct a compression test on cylinder 8, and inspect for any vacuum leaks.

5. Can driving with OBDII code P0308 in a Ford, which signifies a Cylinder 8 misfire, cause further damage to the vehicle?

Continued driving with a misfire can potentially lead to damage to the catalytic converter or other engine components, so it is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P0308 in a Ford associated with a Cylinder 8 misfire?

The cost of repair can vary depending on the specific cause of the misfire, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive measures to avoid encountering OBDII code P0308 in a Ford due to a Cylinder 8 misfire in the future?

Regular maintenance, such as changing spark plugs at recommended intervals, ensuring proper ignition system function, and addressing any engine performance issues promptly, can help prevent misfires.

8. Can weather conditions or driving habits contribute to triggering OBDII code P0308 in a Ford related to a Cylinder 8 misfire?

Extreme weather conditions, such as very cold temperatures, or aggressive driving habits that put additional stress on the engine, can potentially contribute to misfires.

9. Should I reset the OBDII code P0308 in a Ford after addressing the Cylinder 8 misfire issue?

After addressing the underlying cause of the misfire, it is recommended to clear the trouble code using an OBDII scanner to reset the system and monitor for any recurrence.

10. Is it advisable to continue driving my Ford if the check engine light is on due to OBDII code P0308 indicating a Cylinder 8 misfire?

It is generally not recommended to drive the vehicle for an extended period with a misfire, as it can lead to further damage and potentially unsafe driving conditions.

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