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

Solution

1. Preparation

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

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the engine cover if necessary.
• Disconnect the wiring harness from the ignition coil on cylinder 2.
• Remove the ignition coil by unbolting it and pulling it out.
• Remove the spark plug using a socket and ratchet.
• Check the spark plug gap and replace it with a new one if necessary, ensuring it meets manufacturer specifications.
• Install the new spark plug and torque it to the manufacturer’s specification (usually around 13-15 lb-ft).
• Install the new ignition coil and reconnect the wiring harness.

3. Inspect and Test Fuel Injector

• Tools Required: Noid light or multimeter, fuel injector cleaner (optional).
• Disconnect the fuel injector connector on cylinder 2.
• Use a noid light to check for pulsing signals when the ignition is turned on or use a multimeter to check resistance per specifications.
• If the injector is faulty, replace it with a new one (ensure to use the same type).
• Optionally, clean the fuel injector using a fuel injector cleaner.

4. Compression Test (if needed)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester and crank the engine for several seconds.
• Record the compression reading and compare it to the manufacturer’s specifications (typically around 100-160 psi).
• If the compression is low, further engine diagnostics may be needed.