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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shocks.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolts.
• Disconnect the electrical connector from the ignition coil.
• Use the spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or fouling; replace it if necessary.
• Set the new spark plug gap according to manufacturer specifications (typically around 0.040 inches for most applications).
• Install the new spark plug and torque it to the specified value (usually around 13-15 lb-ft).
• Reattach the ignition coil and reconnect the electrical connector.

3. Inspect and Test Ignition Coil

• Tools Required: Multimeter.
• Remove the ignition coil again if it was not replaced in the previous step.
• Use a multimeter to check the primary and secondary resistance of the ignition coil as per manufacturer specifications.
• If the ignition coil is faulty, replace it with a new one.
• Reinstall the ignition coil.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools.
• Remove the fuel injector from cylinder 1 after disconnecting the fuel rail.
• Inspect the injector for clogs or damage.
• Clean the injector using a fuel injector cleaning kit or replace if necessary.
• Reinstall the fuel injector ensuring proper alignment and sealing.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the results with manufacturer specifications (typically around 120-200 psi).
• If compression is low, investigate further for internal engine issues.