how to fix P0302 misfire code in 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 if recently operated.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil using the appropriate socket.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug is fine, test the ignition coil for proper operation using a multimeter (measure primary and secondary resistance).
• If out of specification, replace the ignition coil with a new one.
• Reinstall the ignition coil and ensure a secure connection to the ignition wiring.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector connector and use a noid light to check for signal.
• If no signal is present, inspect the wiring for damage.
• If the injector is faulty, remove it using the appropriate tools and replace it with a new unit.
• Clean the injector ports if necessary before installation.

5. Check Compression

• If misfire persists, perform a compression test on cylinder 2.
• If compression is low, further investigate potential internal engine issues (e.g., valves, piston rings).
• Address any mechanical issues identified.