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

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

556 words

Problem Statement

Explore common issues with the all-wheel-drive system in the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component

all-wheel-drive system

Estimated Time

2-4 hours

Symptoms

•Unusual Noises: Knocking or grinding noises when accelerating or turning.
•Warning Lights: Activation of the AWD or traction control warning lights on the dashboard.
•Slipping or Jerking: Feeling of the vehicle slipping or jerking during acceleration, particularly in wet or slippery conditions.
•Reduced Traction: Difficulty maintaining grip on slippery surfaces, even with the AWD engaged.

Diagnostic Steps

1
Visual Inspection: Check for visible leaks around the transfer case and differential. Inspect the condition of the tires for uneven wear.
2
Scan for Codes: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the AWD system.
3
Test Drive: Take the vehicle for a test drive to replicate the symptoms.
4
Check Fluid Levels: Inspect the transfer case fluid level and condition.
5
Inspect the AWD System Components: Check the operation of the transfer case and front/rear differentials.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

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

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Symptoms

•Unusual Noises: Knocking or grinding noises when accelerating or turning.

•Warning Lights: Activation of the AWD or traction control warning lights on the dashboard.

•Slipping or Jerking: Feeling of the vehicle slipping or jerking during acceleration, particularly in wet or slippery conditions.

•Reduced Traction: Difficulty maintaining grip on slippery surfaces, even with the AWD engaged.

Diagnostic Steps

1
Visual Inspection: Check for visible leaks around the transfer case and differential. Inspect the condition of the tires for uneven wear.
2
Scan for Codes: Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the AWD system.
3
Test Drive: Take the vehicle for a test drive to replicate the symptoms.
4
Check Fluid Levels: Inspect the transfer case fluid level and condition.
5
Inspect the AWD System Components: Check the operation of the transfer case and front/rear differentials.

Solution

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

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.
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.
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.
Test the AWD System:
- After repairs, conduct another test drive to ensure the issues are resolved. Monitor for any abnormal sounds or behaviors.
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.