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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, software update tool.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the 12V battery for safety before beginning any repairs.

2. Software Update

• Sub-steps:
  1. Connect the vehicle to a Wi-Fi network.
  2. Access the vehicle’s software settings from the touchscreen.
  3. Check for software updates and install if available.
  4. Reconnect the battery after the update is complete.

3. Inspect and Repair High-Voltage Connections

• Sub-steps:
  1. Remove the access panel to the high-voltage battery.
  2. Inspect all high-voltage connectors for corrosion and secure fit.
  3. Tighten any loose connections and replace any corroded connectors.
  4. Reinstall the access panel.

4. Test Battery and Inverter

• Sub-steps:
  1. Use a multimeter to check the voltage of the battery cells.
  2. Ensure that all cells are within the manufacturer's specified range.
  3. If any cells are malfunctioning, consult the Tesla service manual for replacement procedures.
  4. Check the inverter for proper operation using diagnostic tools.

5. Recheck Codes

• Sub-steps:
  1. Reconnect the 12V battery.
  2. Use the OBD-II scanner to clear any fault codes.
  3. Start the vehicle and monitor for the reoccurrence of the P0300 code.