my Ram 1500 DT (2019-Present) has a check engine light with P0301 code

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety during the repair.

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the engine cover if applicable.
  • Disconnect the ignition coil connector for cylinder 1.
  • Remove the ignition coil using a socket set.
  • Remove the spark plug using a spark plug socket.
  • Inspect the spark plug for wear or damage. If worn, replace with a new spark plug (OEM specification).
  • Reinstall the new spark plug and torque to manufacturer specifications (typically around 13-15 lb-ft).
  • Reinstall ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil (if necessary)

• Sub-steps:
  • If the ignition coil appears faulty, remove it as previously described.
  • Install a new ignition coil (OEM specification).
  • Ensure all connections are secure and reconnect the negative battery terminal.

4. Check Fuel Injector Functionality

• Sub-steps:
  • Disconnect the fuel injector connector for cylinder 1.
  • Use a noid light to check for voltage at the connector while cranking the engine.
  • If no voltage is detected, inspect wiring and connections.
  • If voltage is present, consider replacing the fuel injector (OEM specification) if it is malfunctioning.

5. Perform Compression Test (if misfire persists)

• Sub-steps:
  • Remove the spark plug from cylinder 1.
  • Insert a compression gauge into the spark plug hole.
  • Crank the engine and record the pressure. Compare to manufacturer specifications (typically around 120-180 psi).
  • If compression is low, further investigate potential head gasket failure or internal engine issues.