how to fix P0301 misfire code in my Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector cleaner.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before starting repairs.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector for cylinder 1.
3. Remove the ignition coil using a socket wrench.
4. Unscrew the spark plug from cylinder 1 using a spark plug socket.
5. Inspect the old spark plug for wear and replace it with a new spark plug (ensure it is gapped correctly).
6. Reinstall the ignition coil and reconnect the connector.

3. Inspect/Replace Ignition Coil

1. If the misfire persists after replacing the spark plug, test the ignition coil with a multimeter.
2. If it is faulty, remove the ignition coil and replace it with a new one.
3. Reinstall the ignition coil and reconnect the connector.

4. Test Fuel Injector

1. Remove the fuel injector for cylinder 1 by disconnecting the wiring harness and unscrewing it.
2. Test the fuel injector with a multimeter to ensure it is functioning. If defective, replace it.
3. Clean the fuel injector using a fuel injector cleaner, if necessary.
4. Reinstall the fuel injector and reconnect the wiring harness.

5. Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole and crank the engine.
3. Check the compression reading; it should be within manufacturer specifications (typically 120-150 PSI).
4. If compression is low, further inspection of the cylinder may be necessary (e.g., checking valves or piston rings).