my Toyota Highlander XU70 (2020-Present) feels like it's slipping in gear

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, multimeter, replacement transmission fluid, and a drain pan.
• Ensure the vehicle is parked on a level surface and the engine is off.

2. Check and Change Transmission Fluid

• Fluid Check:

  • Remove the transmission dipstick and wipe it clean.
  • Reinsert the dipstick and check the fluid level against the markings.
  • If low, add the recommended transmission fluid until it reaches the correct level.

• Fluid Change:

  • Place a drain pan under the transmission pan.
  • Remove the transmission pan bolts using a socket set.
  • Carefully lower the pan and allow old fluid to drain completely.
  • Clean the pan and replace the filter if necessary.
  • Reinstall the transmission pan, tightening bolts to the manufacturer’s specified torque (usually around 8-10 ft-lbs for most Toyota models).
  • Refill the transmission with new fluid using the correct type (usually Toyota ATF WS for the Highlander).

3. Inspect and Repair Components

• Inspect the transmission lines for any signs of wear or damage; replace if necessary.
• If error codes indicate a faulty throttle position sensor, remove the sensor and test its operation with a multimeter. Replace if readings are outside manufacturer's specifications.