how to fix P0300 misfire code on Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, torque wrench, socket set, and a basic tool kit.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the high-voltage battery before performing any repairs to avoid electric shock.

2. Inspect and Replace Spark Plugs (if applicable)

• Remove the engine cover using the appropriate socket.
• Carefully disconnect the electrical connectors from the spark plugs.
• Use a spark plug socket to remove the spark plugs from the cylinder head.
• Inspect the spark plugs for wear, carbon buildup, or damage. If they are worn or fouled, replace them with OEM parts.
• Torque the new spark plugs to the manufacturer’s specifications (typically around 18-22 lb-ft for Tesla).
• Reconnect the electrical connectors and replace the engine cover.

3. Check and Replace Coil Packs (if necessary)

• With the engine cover removed, inspect the coil packs for cracks or damage.
• Disconnect the wiring harness from each coil pack.
• Remove the coil packs using the appropriate socket.
• Install the new coil packs and reconnect the wiring harness.
• Ensure all connections are secure and replace the engine cover.

4. Update Software (if needed)

• Connect the vehicle to a Wi-Fi network.
• Check for software updates through the Tesla touchscreen interface.
• Follow the prompts to download and install any available updates.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear any stored codes.
• Perform a test drive to monitor the vehicle's performance and check for reoccurrence of the P0300 code.