how to fix P0700 transmission control system code in Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and secured with wheel chocks.
• Disconnect the 12V battery to prevent electrical shorts.

2. Check Transmission Fluid

• Remove the transmission fluid dipstick (if applicable) or access the transmission fill plug.
• Use a clean cloth to wipe the dipstick and reinsert it to check the fluid level.
• If the fluid is low, top it off with the recommended transmission fluid (Tesla recommends using their proprietary fluid).
• Inspect the fluid for a burnt smell or metallic particles; if present, a fluid change may be necessary.

3. Inspect Wiring and Connectors

• Locate the TCM, typically found near the transmission.
• Visually inspect the wiring harness and connectors for wear or damage.
• Use a multimeter to test for continuity in the wiring.
• Repair or replace any damaged wires or connectors.

4. Update TCM Software

• Connect a compatible diagnostic tool that can interface with Tesla’s systems.
• Check for any available software updates for the TCM.
• Follow the tool instructions to update if necessary.

5. Replace TCM (if needed)

• If the TCM is deemed faulty, remove it by:
  1. Disconnecting the wiring harness from the TCM.
  2. Unbolting the TCM from its mounting location using a socket set.
  3. Installing the new TCM by reversing the removal steps.
• Ensure all connections are tight and secure.

6. Reconnect Battery and Test

• Reconnect the 12V battery.
• Start the vehicle and perform a test drive to ensure proper operation.
• Monitor for any warning lights or codes.