P0306 Ford Code - Cylinder 6 Misfire Detected
Quick Answer
Misfire is defined as a lack of combustion in a cylinder due to the absence of a spark, incorrect fuel metering, low compression, or any other cause. 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 Ford 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.
Code P0306 Ford 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 Malfunction Indicator Lamp (MIL) blinks once per second when detecting a misfire severe enough to cause catalyst damage. If the MIL is in a steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
This Diagnostic Trouble Code (DTC) sets when the misfire detection monitor detects an engine misfire in cylinder 6.
What are the Possible Causes of the DTC P0306 Ford?
- 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 Ford?
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.
Code Tech Notes
There is a Factory Service Bulletin for the 2011 Ford Mustang:
2011 Ford Mustang Factory Service Bulletin OBDII Code P0306
The Factory Service Bulletin recommends reprogramming the Powertrain Control Module (PCM) to resolve the problem.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0306 Ford 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 Ford code?
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Need Help with the Code?
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Information for Specific Ford Models
- P0306 1997 Ford F150 — Cylinder 6 Misfire Detected
- P0306 1998 Ford F150 — Cylinder 6 Misfire Detected
- P0306 1999 Ford F150 — Cylinder 6 Misfire Detected
- P0306 2000 Ford F150 — Cylinder 6 Misfire Detected
- P0306 2001 Ford F150 — Cylinder 6 Misfire Detected
- P0306 2002 Ford F150 — Cylinder 6 Misfire Detected
- P0306 2003 Ford F150 — Cylinder 6 Misfire Detected
- P0306 2006 Ford Fusion — Cylinder 6 Misfire Detected
- P0306 2007 Ford Fusion — Cylinder 6 Misfire Detected
- P0306 2008 Ford Fusion — Cylinder 6 Misfire Detected
- P0306 2009 Ford Fusion — Cylinder 6 Misfire Detected
- P0306 2010 Ford Fusion — Cylinder 6 Misfire Detected
- P0306 2011 Ford Fusion — Cylinder 6 Misfire Detected
- P0306 2012 Ford Fusion — Cylinder 6 Misfire Detected
Frequently Asked Questions about P0306 Ford Code
1. What are the common symptoms of OBDII code P0306 in a Ford, indicating a Cylinder 6 misfire?
- Common symptoms include engine misfiring, rough idling, loss of power, and potential engine vibrations.
2. What are the potential causes of a Cylinder 6 misfire detected by the OBDII code P0306 in a Ford?
- Possible causes include faulty spark plugs, ignition coil issues, fuel injector problems, vacuum leaks, or compression issues in Cylinder 6.
3. How can I diagnose the cause of the Cylinder 6 misfire indicated by code P0306 in my Ford?
- Diagnostic steps may involve inspecting spark plugs, checking ignition coils, testing fuel injectors, scanning for vacuum leaks, and performing a compression test on Cylinder 6.
4. Can driving with OBDII code P0306, signaling a Cylinder 6 misfire in a Ford, cause further damage to the engine?
- Continuing to drive with a misfire can potentially damage the catalytic converter, oxygen sensors, or other engine components over time. It's advisable to address the issue promptly.
5. Is it safe to continue driving my Ford with the check engine light on due to code P0306 indicating a Cylinder 6 misfire?
- It is generally not recommended to drive with a misfire, as it can lead to poor engine performance, reduced fuel efficiency, and potential long-term damage. It's best to address the issue promptly.
6. How can I repair a Cylinder 6 misfire detected by OBDII code P0306 in my Ford?
- Repair options may include replacing spark plugs, ignition coils, fuel injectors, addressing vacuum leaks, performing a cylinder compression test, or seeking professional diagnostic assistance.
7. Are there any DIY tips for resolving a Cylinder 6 misfire indicated by OBDII code P0306 in a Ford?
- DIY tips may include checking and replacing spark plugs, inspecting ignition coils for damage, cleaning or replacing fuel injectors, and ensuring all vacuum lines are secure.
8. Can weather conditions affect the occurrence of a Cylinder 6 misfire identified by OBDII code P0306 in my Ford?
- Extreme weather conditions, such as cold temperatures or high humidity, can sometimes exacerbate existing issues leading to a misfire. Ensuring the ignition system is in good condition is crucial in such conditions.
9. How often should spark plugs be replaced to prevent Cylinder 6 misfires triggering OBDII code P0306 in a Ford?
- It is recommended to follow the manufacturer's guidelines for spark plug replacement, typically ranging from 30,000 to 100,000 miles depending on the type of spark plugs used in the vehicle.
10. Can a dirty air filter contribute to a Cylinder 6 misfire indicated by OBDII code P0306 in a Ford?
- A clogged or dirty air filter can affect the air-fuel mixture entering the engine, potentially leading to misfires in one or more cylinders, including Cylinder 6. Regular air filter maintenance is advisable.
Discuss the causes and fixes for P0306 Ford OBDII Code
-
After chasing this error code for months and replacing half a dozen different parts and several hundred dollars later ended up being the electrical plug/connector to the fuel injector. After replacing that - a $5 part - cleared the error codes and all is good.
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