P0312 Fault Code

Cylinder 12 Misfire Detected

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

The P0312 code indicates a cylinder 12 misfire has been detected by the Engine Control Module (ECM). This can lead to poor performance, increased emissions, and potential engine damage if not addressed. Misfires occur when the combustion process in the cylinder fails to occur correctly, resulting in a loss of power and efficiency.

What are the symptoms of the P0312 code?

Common symptoms associated with a P0312 code may include:

• Rough idling or poor engine performance
• Reduced acceleration and power while driving
• Engine vibrations due to misfires
• Increased fuel consumption
• Engine warning light illuminated on the dashboard.

What causes the P0312 code?

Several factors can contribute to a cylinder 12 misfire, including:

• Faulty ignition components such as spark plugs or ignition coils
• Fuel delivery issues, including clogged fuel injectors or a failing fuel pump
• Vacuum leaks that disrupt the air-fuel mixture
• Engine mechanical problems like low compression or damaged valves
• Faulty sensors (like the camshaft or crankshaft position sensors) providing incorrect readings to the ECM.

How to fix P0312?

To resolve a P0312 code, a thorough diagnostic inspection should be performed. Recommended fixes include:

• Replacing faulty spark plugs and ignition coils
• Repairing or replacing clogged fuel injectors
• Checking for vacuum leaks and sealing any detected leaks
• Ensuring that the fuel delivery system is functioning correctly
• Performing a compression test to assess engine health and addressing any mechanical issues.