P0311 Fault Code

Cylinder 11 Misfire Detected

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0311 fault code indicates that the engine control module (ECM) has detected a misfire in cylinder 11. This can lead to poor engine performance, increased emissions, and can potentially cause damage to the engine if not addressed promptly. Misfires may occur during idling, acceleration, or under load, depending on the underlying issue.

What are the symptoms of the P0311 code?

Drivers may notice the following symptoms when there is a misfire in cylinder 11:

• Rough idling or hesitation during acceleration
• Loss of power or reduced engine efficiency
• Increased fuel consumption
• Illuminated check engine light on the dashboard.
• Possible unusual engine noises or vibrations.

What causes the P0311 code?

Several factors can contribute to a misfire in cylinder 11, including:

• Faulty spark plugs or ignition coils
• Insufficient fuel delivery to the cylinder
• Air leaks or vacuum leaks affecting the air-fuel mixture
• Clogged fuel injectors.
• Engine mechanical issues such as low compression or valve problems.

How to fix P0311?

To resolve the P0311 fault code, the following steps should be taken:

• Use an OBD-II scanner to confirm the code and check for related codes.
• Inspect and replace faulty spark plugs or ignition coils as necessary.
• Check fuel injectors for clogs and clean or replace them if needed.
• Examine the air intake system for any leaks and repair as required.
• Conduct a compression test to ensure engine internals are functioning correctly, addressing any mechanical problems found.