how to fix P0305 misfire code on Ram 1500 DT (2019-Present)?

Learn how to diagnose and fix P0305 cylinder 5 misfire in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coil cover if necessary.
• Unscrew and remove the spark plug from cylinder 5.
• Inspect the spark plug for wear, carbon buildup, or damage.
• Replace the spark plug with a new one, ensuring it is gapped correctly according to manufacturer specifications (typically around 0.040 inches).
• Torque the spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Test and Replace Ignition Coil

• Tools Required: Multimeter, socket set
• Disconnect the electrical connector from the ignition coil on cylinder 5.
• Use a multimeter to test the resistance of the ignition coil; compare results to manufacturer specifications.
• If the ignition coil is faulty, remove it and replace it with a new one.
• Reconnect the ignition coil.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit, socket set
• Disconnect the fuel injector connector and fuel line (be cautious of fuel spillage).
• Remove the fuel injector from cylinder 5.
• Clean the fuel injector using a cleaning kit, or replace it if necessary.
• Reinstall the fuel injector and reconnect the fuel line and connector.

5. Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 5.
• Insert the compression tester into the spark plug hole.
• Crank the engine and observe the compression reading.
• Compare the reading to the manufacturer’s specifications (typically between 120-180 psi). If low, further engine diagnosis may be required.