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

• •Illuminated check engine light
• •Rough idle or engine vibration
• •Decreased acceleration or power
• •Increased fuel consumption
• •Potential loss of power to the electric motors

1. 1Use an OBD-II scanner to confirm the P0300 code and check for additional codes related to misfires.
2. 2Inspect the battery state of charge and health to ensure adequate power delivery to the electric motors.
3. 3Examine wiring harnesses and connectors for signs of damage or corrosion.
4. 4Check for software updates that may address performance issues or misfire codes.
5. 5Inspect the cooling system to ensure the battery and motor systems are operating within normal temperature ranges.
6. 6Perform a visual inspection of the electric motor connections for loose or faulty connectors.

After completing the repair, verify that the issue has been resolved:

• ✓Test the affected component to ensure it functions correctly
• ✓Check for any error codes or warning lights
• ✓Monitor the vehicle for a few days to ensure the issue does not recur

To prevent this issue from occurring again:

• •Follow the manufacturer's recommended maintenance schedule
• •Address warning signs early before they develop into major issues
• •Use quality parts and fluids recommended for your vehicle
• •Keep detailed records of all repairs and maintenance

• •OBD-II scanner
• •Electrical cleaner
• •Soft brush
• •Multimeter
• •Torque wrench

• •Electrical connectors (if damaged)
• •Any necessary software updates