how to resolve P0700 transmission code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery cable to ensure safety.
• Ensure the vehicle is on a level surface and securely supported with jack stands if needed.

2. Inspect and Replace Transmission Fluid

• Remove the transmission fluid dipstick and check the fluid level.
• If low, add the correct type of transmission fluid (Toyota ATF WS).
• If the fluid is dirty or burnt, drain the old fluid using the transmission drain plug.
• Replace with new transmission fluid, ensuring the correct quantity is added (approximately 3-4 quarts for a fluid change).

3. Check and Repair Wiring/Connectors

• Visually inspect all wiring harnesses connected to the transmission control module for fraying or damage.
• Disconnect the TCM connector and clean it with electrical contact cleaner. Allow it to dry completely.
• Reconnect the TCM and ensure a secure fit.

4. Test the Transmission Control Module

• Use a multimeter to check the TCM’s power and ground connections to ensure they are receiving the correct voltage.
• If the TCM is faulty (based on prior diagnostics), proceed to replace it.
• Remove the TCM by unscrewing the mounting bolts and disconnecting the wiring harness.
• Install the new TCM by reversing the removal procedure and ensuring all connections are secure.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery cable.
• Use the OBD-II scanner to clear the P0700 code and any related codes.
• Perform a road test to verify that the issue has been resolved.