P0306 Subaru 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 Subaru 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 Subaru Description
What are the Possible Causes of the DTC P0306 Subaru?
- 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 Subaru?
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0306 Subaru 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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Frequently Asked Questions about P0306 Subaru Code
1. What does the OBDII code P0306 mean on a Subaru?
P0306 indicates that the engine control module (ECM) has detected a misfire in cylinder 6 of the engine.
2. What are the common symptoms of a P0306 code in a Subaru?
Symptoms include rough idling, poor acceleration, reduced fuel efficiency, engine vibration, and the check engine light being illuminated.
3. What causes a P0306 code on a Subaru?
Common causes include a faulty spark plug, bad ignition coil, clogged fuel injector, vacuum leaks, low compression in cylinder 6, or a malfunctioning ECM.
4. Can I drive my Subaru with a P0306 code?
It’s not recommended to drive for long with a P0306 code, as the misfire can damage the catalytic converter and lead to more severe engine issues.
5. How do I diagnose the P0306 code on my Subaru?
Start by inspecting the spark plug and ignition coil for cylinder 6, checking for vacuum leaks, testing the fuel injector, and performing a compression test.
6. How much does it cost to fix a P0306 code on a Subaru?
The repair cost varies depending on the cause but can range from $100 for a spark plug replacement to over $1,000 for repairs like fixing low compression.
7. Can a dirty fuel injector cause a P0306 code?
Yes, a clogged or malfunctioning fuel injector can prevent proper fuel delivery to cylinder 6, leading to a misfire.
8. How can I prevent a P0306 code from occurring again?
Regular maintenance, including replacing spark plugs and ignition coils as recommended and using quality fuel, can help prevent misfires.
9. Is a P0306 code specific to Subarus?
No, the P0306 code is a generic OBDII code that applies to all vehicles with an OBDII system, but this FAQ focuses on Subaru-specific concerns.
10. Can a vacuum leak in the intake manifold trigger a P0306 code?
Yes, a vacuum leak near cylinder 6 can disrupt the air-fuel mixture, causing a misfire and triggering the P0306 code.
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