P0311 Code - Cylinder 11 Misfire Detected
Quick Answer
When a vehicle's onboard computer detects a misfire in cylinder 11, it triggers diagnostic trouble code P0311. Common causes include Faulty spark plug in cylinder 11, Failing ignition coil specific to cylinder 11, Clogged or malfunctioning fuel injector in cylinder 11. 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
- P0311 indicates Cylinder 11 Misfire Detected.
- Common causes
- Common causes include Faulty spark plug in cylinder 11, Failing ignition coil specific to cylinder 11, Clogged or malfunctioning fuel injector in cylinder 11.
- 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 P0311 Description
When a vehicle's onboard computer detects a misfire in cylinder 11, it triggers diagnostic trouble code P0311. This code specifically indicates that the misfire has been detected in the eleventh cylinder of the engine. A misfire occurs when fuel in the cylinder fails to ignite at the proper time, causing a disruption in the combustion process. This can lead to a variety of issues, including reduced performance, decreased fuel efficiency, and potential damage to the engine over time.
Common Causes of P0311
- Faulty spark plug in cylinder 11.
- Failing ignition coil specific to cylinder 11.
- Clogged or malfunctioning fuel injector in cylinder 11.
- Vacuum leaks affecting cylinder 11.
- Internal engine damage in cylinder 11 (e.g., worn piston rings).
Symptoms of P0311
- Rough idle or vibrations when the engine is running.
- Loss of power or acceleration.
- Increased fuel consumption.
- Engine misfires or hesitation during acceleration.
- Check engine light illuminated on the dashboard.
How to Fix P0311
- Begin by diagnosing the specific cause of the misfire, using a scan tool to identify cylinder 11 and checking for related issues such as faulty spark plugs or ignition components.
- Replace the faulty spark plug in cylinder 11, ensuring proper gapping and installation.
- Test and replace the ignition coil if necessary for cylinder 11.
- Clean or replace the fuel injector in cylinder 11 to ensure proper fuel delivery.
- Conduct a compression test on cylinder 11 to check for internal engine damage and address any issues found.
Cost to Fix P0311
The cost of repairing a cylinder 11 misfire can vary depending on the specific cause of the issue and the extent of the repairs needed. Typically, replacing a single spark plug can cost between $50-100, while an ignition coil replacement may range from $150-300. Cleaning or replacing a fuel injector can cost around $100-300, and internal engine repairs can be more expensive, potentially costing several hundred to over a thousand dollars. Labor costs can also add to the overall expense, with rates typically ranging from $80-150 per hour. It is recommended to consult with a qualified mechanic for an accurate estimate based on the specific circumstances of the vehicle in question.
Tech Notes for P0311
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Code P0311 Information for Specific Makes
- P0311 Mercedes-Benz — Cylinder 11 Misfire Detected
- P0311 Volkswagen — Cylinder 11 Misfire Condition
Frequently Asked Questions about P0311 Code
No Frequently Asked Questions about P0311 Code found.
Discuss the causes and fixes for P0311 OBDII Code
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What cylinder 11 misfire mean(fault code p0311) , when it’s a 6 cylinder engine ?
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Double check the code, the P0311 code is for vehicles with 12 cylinders engine. There is no information in the factory service manual about that code.
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It must be my cheap scan tools from eBay , I will take it into a garage tommorrow for another scan . Thx
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