how to fix P0302 misfire code on my Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector.
• Remove the ignition coil bolt and lift the ignition coil out.
• Use a spark plug socket to remove the old spark plug from cylinder 2.
• Inspect the spark plug gap and condition, and replace with a new spark plug if necessary.
• Install the new spark plug, ensuring correct torque (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter.
• Measure the resistance of the ignition coil to ensure it is within specifications (consult service manual for specific values).
• If out of spec, remove the ignition coil and replace it with a new one.
• Reconnect the connectors.

4. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector removal tool.
• Disconnect the fuel line and electrical connector from the fuel injector.
• Remove the fuel injector using the appropriate tool.
• Inspect for clogs or damage; replace with a new injector if necessary.
• Reinstall the new injector and reconnect the fuel line and connector.

5. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; if low, further investigation into internal engine issues may be necessary.