what does it mean when my Ram 1500 DT (2019-Present) has a P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect Spark Plug and Ignition Coil

• Remove the engine cover (if applicable) using a socket set.
• Remove the spark plug wire or ignition coil connector for cylinder 1.
• Use a spark plug socket to remove the spark plug; inspect for wear or fouling.
• If the spark plug is damaged, replace it with a new one, ensuring it matches OEM specifications (usually gap set at 0.040 inches).
• Test and replace the ignition coil if necessary, ensuring proper seating and connector attachment.

3. Perform Compression Test

• Reinstall the spark plug wire or ignition coil temporarily.
• Remove the fuel pump relay to prevent fuel delivery.
• Remove the spark plug from cylinder 1 again.
• Insert a compression gauge into the spark plug hole and crank the engine for a few seconds.
• Record the compression reading; it should be within the manufacturer's specified range (typically between 120-200 psi). If compression is low, further diagnosis is needed for potential internal engine issues.

4. Check Fuel Injector Operation

• Reconnect the fuel pump relay.
• Use a noid light to check for signal at the fuel injector connector for cylinder 1 when the engine is cranked.
• If there is no signal, inspect the wiring and the Engine Control Module (ECM) for faults.
• If the signal is present, remove the fuel injector and inspect it for clogs or damage; replace if necessary.

5. Reassemble and Test

• Reinstall all components in reverse order of removal.
• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the engine and check for any signs of misfire or check engine light reappearance.