how to fix P0301 misfire code Ram 1500 DT (2019-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 1 (refer to service manual for specific location).
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If damaged, install a new spark plug with a gap of 0.040 inches (1.01 mm).
• Torque the spark plug to 15 lb-ft (20 Nm).

3. Test and Replace Ignition Coil

• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil by unscrewing the retaining bolts.
• Test the ignition coil with a multimeter (primary resistance should be approximately 0.5-2 ohms).
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Compression Test (If Needed)

• Remove the spark plug from cylinder 1 and install a compression tester.
• Crank the engine and record the compression reading (should be within the range specified in the service manual).
• If compression is low, further investigation into internal engine issues (valve or piston problems) may be necessary.

5. Inspect and Test Fuel Injector

• Use an injector test tool or multimeter to check the fuel injector's resistance (should be around 12-16 ohms).
• If the injector is faulty, replace it and ensure proper seating and electrical connection.