my Ram 1500 DT (2019-Present) has a check engine light with code P0301

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Using a socket and ratchet, remove the spark plug from cylinder 1.
• Inspect the old spark plug for wear; replace if necessary.
• Install a new spark plug (ensure the gap is correct as per manufacturer specifications).
• Torque the spark plug to the manufacturer’s specification (typically 13-15 lb-ft).

3. Inspect/Replace Ignition Coil

• Locate the ignition coil for cylinder 1 and disconnect the electrical connector.
• Remove the ignition coil mounting bolts with a socket and ratchet.
• Inspect the coil for cracks or damage; replace if defective.
• Install the new ignition coil and reconnect the electrical connector.
• Torque the mounting bolts to the manufacturer’s specification.

4. Check Fuel Injector Functionality

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for power to the injector while cranking the engine.
• If no power is detected, trace wiring back to the engine control unit (ECU) and repair as necessary.
• If the injector is faulty, remove it using an injector puller and replace it with a new one, ensuring proper sealing.

5. Compression Test (if required)

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole and crank the engine.
• Record the pressure reading; compare it against manufacturer specifications.
• If compression is low, investigate potential causes such as valve issues or head gasket failure.