how to fix P0300 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.
• Ensure the vehicle is in a safe, well-ventilated area.
• Disconnect the high-voltage battery according to Tesla's service manual to ensure safety during repairs.

2. Inspect and Repair Wiring/Connectors

• Sub-step 1: Visually inspect all wiring and connectors related to the electric drive unit for damage, corrosion, or loose connections.
• Sub-step 2: Clean any corroded connectors with electrical contact cleaner.
• Sub-step 3: Repair or replace any damaged wiring using appropriate gauge wire and connectors, ensuring to use heat shrink tubing for insulation.

3. Check and Repair Cooling System

• Sub-step 1: Inspect the coolant reservoir and lines connected to the electric drive unit for leaks or blockages.
• Sub-step 2: Replace any damaged hoses or components.
• Sub-step 3: Refill the coolant system with the recommended coolant type as per the Tesla specifications.

4. Test Electric Drive Unit

• Sub-step 1: Reconnect the high-voltage battery.
• Sub-step 2: Use Tesla's diagnostic tools to conduct a thorough test of the electric drive unit.
• Sub-step 3: Replace the electric drive unit if it fails the diagnostic tests.

5. Clear Codes and Test Drive

• Sub-step 1: Use the OBD-II scanner to clear the P0300 code and any other related codes.
• Sub-step 2: Conduct a test drive to verify the issue has been resolved and monitor for any reoccurrence of the fault.