how to diagnose the P0700 code on my Tesla Model S Original (2012-2020)

Learn to diagnose and fix P0700 transmission control system malfunction in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures.

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, fluid pump, torque wrench.
• Disconnect the vehicle's 12V battery to prevent electrical shock or short circuits.

2. Address Fluid Issues

• Check Fluid Level: Remove the transmission fill plug and check the fluid level. If low, add the manufacturer-recommended transmission fluid until the level is correct.
• Change Fluid if Necessary: If the fluid is dark or smells burnt, perform a fluid change.
  • Sub-steps:
    1. Place a drain pan under the transmission.
    2. Remove the drain plug and let old fluid drain out.
    3. Replace the drain plug and torque to manufacturer specifications.
    4. Refill with new transmission fluid using a fluid pump until it reaches the proper level.

3. Reprogram TCM (if required)

• Update Software: Using the Tesla service tool, check for and apply any software updates for the TCM.
  • Sub-steps:
    1. Connect the diagnostic tool to the vehicle.
    2. Navigate to the TCM software section.
    3. Follow prompts to update if updates are available.

4. Repair or Replace TCM

• Inspect and Replace TCM: If communication tests fail, the TCM may need to be replaced.
  • Sub-steps:
    1. Locate the TCM (generally near the transmission).
    2. Disconnect the wiring harness.
    3. Remove mounting bolts and take out the old TCM.
    4. Install the new TCM and secure with bolts.
    5. Reconnect the wiring harness and ensure a secure fit.