Are there any known problems with the all-wheel-drive system in the 2020 Highlander?

Known Problems with the All-Wheel-Drive System in the 2020 Toyota Highlander

The 2020 Toyota Highlander, part of the fourth generation (XU70), has received generally positive reviews, but some owners have reported issues with the all-wheel-drive (AWD) system. Below are some symptoms, diagnostic steps, and potential resolutions.

Tools Required

• OBD-II Scanner
• Torque wrench
• Fluid pump (for transferring fluids)
• Socket set
• Screwdrivers
• Jack and jack stands
• Torque specifications chart for the Highlander

Repair Instructions

1. Address Fluid Issues:

   • If Fluid is Low:

     • Locate the fill plug on the transfer case and remove it.
     • Use a fluid pump to add the manufacturer-recommended AWD fluid until it begins to seep from the fill hole.
     • Replace the fill plug and torque it to the manufacturer’s specifications.

   • If Fluid is Contaminated:

     • Drain the old fluid using a drain pan.
     • Replace the fluid with new, manufacturer-recommended fluid.
     • Ensure all seals are in good condition and replace any that are worn.

2. Replace Worn Components:

   • If any components (like driveshafts, CV joints, or bearings) are found to be worn or damaged, replace them.
   • Use a torque wrench to ensure all fasteners are tightened to the manufacturer’s specifications.

3. Reprogram the AWD System (if needed):

   • If DTCs suggest a reprogramming is necessary, connect the vehicle to a Toyota-certified scanner and follow the reprogramming steps according to the service manual.

4. Test the AWD System:

   • After repairs, conduct another test drive to ensure the issues are resolved. Monitor for any abnormal sounds or behaviors.

5. Regular Maintenance:

   • Schedule regular maintenance checks on the AWD system as part of routine vehicle care to prevent future issues.

Conclusion

While the 2020 Toyota Highlander's AWD system generally performs well, issues can arise, primarily due to fluid levels or component wear. Following the diagnostic steps and repair instructions outlined above can help resolve common problems. For persistent issues, consulting a certified Toyota technician is recommended.