how to diagnose my Ram 1500 DT (2019-Present) with a P0301 code

Solution

1. Preparation

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

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate the spark plug in cylinder 1.
3. Use a socket wrench to remove the spark plug, ensuring to keep track of the order.
4. Inspect the old spark plug for wear and replace with a new one that meets manufacturer specifications (check gap).
5. Install the new spark plug, tightening to the manufacturer’s torque specification (typically around 13-15 ft-lbs).

3. Test and Replace Ignition Coil

1. Remove the connector from the ignition coil in cylinder 1.
2. Use a multimeter to measure resistance across the coil terminals (should be within spec; consult the service manual).
3. If the coil is faulty, remove the old coil and install a new ignition coil.
4. Reconnect the ignition coil connector ensuring it is secure.

4. Inspect and Replace Fuel Injector

1. Disconnect the fuel injector connector in cylinder 1.
2. Use a noid light to check for injector pulse. If there is no pulse, further investigate the wiring or ECM.
3. If the injector is faulty, remove the old injector and install a new one, ensuring proper seating.
4. Reconnect the injector connector.