P0311 – OBD-II DTC

OBD-II DTC P0311 – Cylinder 10 Misfire Detected

DTC P0311 meaning

DTC P0311 indicates that the Engine Control Module (ECM) has detected a misfire in cylinder 10. This code is part of the On-Board Diagnostics II (OBD-II) system, which monitors the performance of the engine and its components. A misfire occurs when the air-fuel mixture in the cylinder fails to ignite properly, leading to a loss of power and increased emissions.

DTC P0311 symptoms

Common symptoms associated with DTC P0311 may include:

• Rough idling or engine shaking
• Decreased engine performance
• Increased fuel consumption
• Check Engine Light (CEL) illuminated
• Unusual exhaust emissions

DTC P0311 causes

Several factors can lead to the triggering of DTC P0311, including:

• Faulty spark plug or ignition coil in cylinder 10
• Fuel delivery issues, such as a clogged fuel injector
• Vacuum leaks affecting the air-fuel mixture
• Compression problems in cylinder 10
• Faulty engine control module (ECM)

DTC P0311 seriousness

DTC P0311 is considered a moderate to serious issue. While it may not cause immediate engine failure, it can lead to:

• Increased emissions and potential failure of emissions tests
• Further engine damage if left unaddressed
• Reduced fuel efficiency and performance

How to diagnose DTC P0311

To diagnose DTC P0311, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0311 code.
2. Inspect the spark plug and ignition coil for cylinder 10.
3. Check the fuel injector operation and fuel pressure.
4. Examine for vacuum leaks around the intake manifold.
5. Perform a compression test on cylinder 10.
6. Review the ECM for any additional trouble codes that may provide more context.

How to fix DTC P0311 step-by-step instructions

To fix DTC P0311, follow these steps:

1. Replace the spark plug and ignition coil for cylinder 10 if they are faulty.
2. Clean or replace the fuel injector if it is clogged or malfunctioning.
3. Repair any vacuum leaks found during inspection.
4. Address any compression issues identified in cylinder 10.
5. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.

How to erase DTC P0311

To erase DTC P0311, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the option to clear or erase trouble codes on the scanner.
4. Confirm the action to erase the DTC.
5. Disconnect the scanner and start the engine to verify that the code does not return.