how to fix P0300 misfire code in Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the high-voltage battery and wait for the safety time as per the manufacturer’s guidelines.
• Ensure the vehicle is on a flat surface and engage the parking brake.

2. Inspect and Clean Connectors

• Remove any covers to access the electrical connectors.
• Inspect the connectors for dirt, corrosion, or water intrusion.
• Clean connectors with electrical contact cleaner and reconnect them securely.

3. Check Battery State of Charge

• Use a multimeter to check the battery voltage.
• If the voltage is below the manufacturer’s specified range, charge the battery or replace it if necessary.

4. Inspect High-Voltage Battery

• Remove the battery cover to inspect for any signs of damage.
• Ensure that all cells are functioning properly and within the acceptable temperature range.

5. Test Drive

• Reconnect the high-voltage battery.
• Start the vehicle and conduct a test drive to monitor for the return of the P0300 code and check for any misfire symptoms.