how to fix transmission codes P0700-P0799 on Tesla Model S Plaid/Refresh (2021-present)?

Learn how to diagnose and fix transmission codes P0700-P0799 on Tesla Model S Plaid. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the vehicle's 12V battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, fluid catch pan, funnel
• Remove the transmission fluid fill plug.
• Use a transmission fluid pump to extract old fluid into the catch pan.
• Inspect the fluid condition; if it's burnt or contaminated, replace it with new fluid.
• Refill the transmission with the appropriate type of Tesla-approved transmission fluid until it reaches the correct level.
• Reinstall the fill plug and torque it to the manufacturer's specification.

3. Inspect and Repair Wiring and Connectors

• Tools Required: Wire stripper, crimping tool, multimeter
• Visually inspect the wiring harness connected to the transmission control module and sensors for any fraying or corrosion.
• Repair any damaged wires by cutting and splicing them or replacing the affected harness.
• Ensure all connectors are clean, free of corrosion, and securely fastened.

4. Test and Replace the Transmission Range Sensor (if necessary)

• Tools Required: Multimeter, socket set
• Disconnect the electrical connector from the transmission range sensor.
• Use a multimeter to check if the sensor is providing the correct output signal when the gear selector is moved.
• If the sensor is faulty, remove it using the socket set and replace it with a new sensor, ensuring it is properly calibrated.

5. Update or Reprogram the Transmission Control Module

• Tools Required: OBD-II scanner with programming capabilities
• Connect the OBD-II scanner to the vehicle and check for available software updates for the transmission control module.
• If updates are available, follow the scanner's instructions to complete the reprogramming process.
• Clear any fault codes and perform a test drive to ensure the issue is resolved.