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

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and unbolt the ignition coil from the cylinder head.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear, carbon buildup, or damage.
• Replace with a new spark plug that meets manufacturer specifications (typically gap of 0.040 inches).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter (check for primary and secondary resistance).
• If the coil is faulty, replace it with a new one that matches OEM specifications.
• Reinstall the ignition coil and reconnect the connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector connector.
• Use a noid light to check for proper signal to the injector.
• If the injector is malfunctioning, remove it using an injector puller if necessary.
• Clean the injector using a fuel injector cleaner or replace it if cleaning does not resolve the issue.
• Reinstall the fuel injector and reconnect the harness.

5. Perform Compression Test

• Remove the spark plug from cylinder 2.
• Insert a compression gauge into the spark plug hole and crank the engine to obtain a reading.
• Compare the reading with the manufacturer’s specifications.
• If compression is low, further diagnosis is needed to determine if there are issues with valves, piston rings, or a head gasket.