how to fix P0700 code in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, fluid catch pan.
• Gather replacement transmission fluid if needed.
• Ensure the vehicle is parked on a level surface and the engine is off.

2. Check and Replace Transmission Fluid

1. Check Fluid Level:
   • Start the engine and let it idle.
   • Shift through all the gears, then return to park.
   • Check the transmission dipstick for the fluid level.
2. Replace Fluid (if necessary):
   • If the fluid is low or contaminated, drain the existing fluid into the catch pan.
   • Remove the transmission pan bolts using the socket set.
   • Carefully drop the pan and clean the mating surface.
   • Replace the filter if applicable.
   • Reinstall the pan and torque the bolts to the manufacturer's specification (typically around 7-10 ft-lbs).
   • Fill the transmission with new fluid through the dipstick tube, using the recommended type.

3. Inspect and Repair Wiring

1. Visual Inspection:
   • Inspect wiring harness and connectors for damage or corrosion.
   • Repair or replace any damaged wiring.
2. Connector Check:
   • Disconnect the TCM connector and check for bent pins.
   • Clean the connector and reattach it securely.

4. Test the Transmission Control Module (TCM)

1. Function Test:
   • Use a multimeter to check the TCM for proper voltage and ground.
   • Refer to the service manual for specific voltage requirements.
2. Reprogram/Replace TCM:
   • If the TCM fails the test, reprogram it using the appropriate software.
   • If reprogramming does not resolve the issue, replace the TCM with a new unit.