how to fix P0300 misfire code in Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0300 random/multiple cylinder misfire in Tesla Model S. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the 12V battery to ensure safety while working on the vehicle.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.

2. Inspect Battery and Connections

• Sub-steps:
  • Remove the rear trunk cover to access the high-voltage battery.
  • Inspect battery terminals for corrosion or loose connections.
  • Tighten any loose connections and clean terminals if necessary.
  • Reconnect the battery and ensure all connectors are seated properly.

3. Check Electric Motor Performance

• Sub-steps:
  • Use a diagnostic tool to access motor performance data.
  • Check for any abnormal readings such as voltage or current draw.
  • If the motor performance is outside of specifications, consider replacing the motor or associated components.

4. Cooling System Inspection

• Sub-steps:
  • Inspect the coolant reservoir and levels; refill if low with the recommended coolant type.
  • Check for any visible leaks in hoses or connections.
  • Ensure the cooling fans are operational.

5. Wiring Inspection

• Sub-steps:
  • Visually inspect all wiring harnesses connected to the battery and motor for wear or damage.
  • Use a multimeter to test for continuity in any damaged wires.
  • Repair or replace any damaged wiring as needed.