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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Remove the ignition coil on cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug; replace if fouled or worn.
• Install the new spark plug to the manufacturer’s torque specification (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test Ignition Coil

• If the spark plug is in good condition, test the ignition coil using a multimeter:
  • Set the multimeter to measure resistance.
  • Measure the primary and secondary resistance of the ignition coil.
  • Compare readings to specifications in the service manual. Replace the coil if readings are out of range.

4. Inspect Fuel Injector

• Remove the fuel injector connector for cylinder 1.
• Use a noid light to check for pulsing when the engine is cranked.
• If no pulse is detected, check the wiring and replace the injector if necessary.

5. Check Compression

• Perform a compression test on cylinder 1:
  • Remove the spark plug and connect the compression tester.
  • Crank the engine and note the compression reading.
  • Compare the reading to the manufacturer's specifications. If low, there may be internal engine problems requiring further inspection.