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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Use a spark plug socket to carefully remove each spark plug.
  3. Inspect the spark plugs for wear or fouling; replace with new plugs if necessary.
  4. Ensure the new spark plugs are gapped according to manufacturer specifications before installation.
  5. Reinstall spark plugs and torque to the manufacturer's specifications (typically around 13-15 ft-lbs).

3. Check and Replace Ignition Coils

• Sub-steps:
  1. Locate the ignition coils on the engine.
  2. Disconnect the electrical connectors from each ignition coil.
  3. Remove the bolts securing the ignition coils and lift them out.
  4. Inspect each coil for damage or cracks; replace any faulty coils with new ones.
  5. Reinstall the ignition coils and reconnect the electrical connectors.

4. Test and Replace Fuel Injector

• Sub-steps:
  1. Use a fuel pressure gauge to measure fuel pressure at the rail.
  2. If pressure is below specifications (usually around 50-60 psi for most engines), inspect the fuel pump and filter.
  3. If a fuel injector is suspected, disconnect the fuel line and remove the injector harness.
  4. Replace faulty fuel injectors by removing retaining clips and lifting the injector out.
  5. Install new injectors, ensuring they are seated properly and reattach the fuel line.

5. Clean or Replace Mass Airflow Sensor (MAF)

• Sub-steps:
  1. Disconnect the MAF sensor connector and remove the sensor from the air intake duct.
  2. Clean the MAF sensor with MAF cleaner spray and let it dry completely.
  3. If cleaning does not resolve the issue, replace the MAF sensor with a new one.
  4. Reinstall the MAF sensor and reconnect the electrical connector.