how to fix Ram 1500 DT (2019-Present) P0300 random misfire code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and engage the parking brake.
• Disconnect the negative battery cable to prevent electrical shock.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug wires or ignition coil packs.
• Using a spark plug socket, remove each spark plug from the cylinder head.
• Inspect the gap on each spark plug and replace with OEM plugs, ensuring the correct gap specification is maintained.
• Torque the new spark plugs to the manufacturer's specification (typically around 13-15 lb-ft).
• Reconnect the ignition components.

3. Inspect and Replace Ignition Coils

• If any ignition coils were found faulty, remove them by unscrewing the retaining bolts and pulling them off the spark plugs.
• Install new ignition coils, ensuring they are securely seated and fastened to the cylinder head.
• Reconnect any electrical connectors to the coils.

4. Clean or Replace Fuel Injectors

• If injectors are clogged, remove them from the fuel rail.
• Use a fuel injector cleaning kit to clean them thoroughly or replace with new injectors if severely clogged or damaged.
• Reinstall cleaned or new injectors, ensuring they are properly seated and connected.

5. Inspect Air Intake System

• Check for any vacuum leaks in the intake manifold and around throttle body gaskets.
• Clean the throttle body using a throttle body cleaner to ensure proper airflow.
• Reconnect any disconnected hoses or components.