how to fix P0700 code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0700 transmission control system malfunction in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is on a level surface and the ignition is off.
• Tools required: OBD-II scanner, multimeter, socket set, and a floor jack with jack stands.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid fill plug.
  2. Use a dipstick or fluid level gauge to check the fluid level.
  3. If low, add the manufacturer-recommended transmission fluid until it reaches the correct level.
  4. If the fluid is discolored or smells burnt, drain and replace it with fresh fluid.
• Parts Required: Tesla-approved transmission fluid.

3. Inspect and Repair Wiring

• Sub-steps:
  1. Visually inspect the wiring harness connected to the TCM for any signs of damage, fraying, or corrosion.
  2. Use a multimeter to check for continuity in the wiring.
  3. Repair any damaged wires or connectors and ensure all connections are secure.

4. Update Software

• Sub-steps:
  1. Check for software updates via the Tesla interface.
  2. If an update is available, follow the prompts to install it.
  3. Restart the vehicle after the update to ensure changes take effect.

5. Replace TCM (if necessary)

• Sub-steps:
  1. Disconnect the vehicle's battery to ensure safety.
  2. Remove the TCM mounting bolts using a socket set.
  3. Carefully disconnect the wiring harness from the TCM.
  4. Install the new TCM by reversing the removal steps.
  5. Reconnect the battery and clear any diagnostic codes.