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What common transmission problems should I look for in a 2021 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What common transmission problems should I look for in a 2021 Toyota Highlander?

What common transmission problems should I look for in a 2021 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
615 words

Problem Statement

Learn about common transmission issues in the 2021 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component
transmission

Symptoms

  • •Slipping Gears
  • •Delayed Engagement
  • •Unusual Noises
  • •Fluid Leaks
  • •Warning Lights
  • •Harsh Shifts

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

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
  • •Transmission fluid dipstick
  • •Socket set
  • •Screwdrivers
  • •Torque wrench
  • •Transmission fluid (Toyota WS type)
  • •Drain pan
  • •Funnel
  • •Safety gloves and goggles

Additional Information

Affected Component
transmission
Difficulty
medium
Severity
medium
Tools Required
9 items

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Back to Generation
Common Transmission Problems in a 2021 Toyota Highlander

The 2021 Toyota Highlander, part of the fourth generation (XU70), may exhibit some common transmission issues despite its overall reliability. Below are the typical symptoms, diagnostic steps, tools required, and repair instructions for addressing these problems.

Tools Required
  • OBD-II scanner
  • Transmission fluid dipstick (if not equipped with a sealed transmission)
  • Socket set
  • Screwdrivers (flathead and Phillips)
  • Torque wrench
  • Transmission fluid (Toyota WS type)
  • Drain pan
  • Funnel
  • Safety gloves and goggles
Repair Instructions

1. Transmission Fluid Change

Symptoms: Poor shifting, delayed engagement, abnormal noises.

Steps:

  1. Prepare the Vehicle:

    • Park on a level surface and engage the parking brake.
    • Raise the vehicle using a jack and secure with jack stands.

  2. Drain Old Fluid:

    • Place a drain pan under the transmission pan.
    • Remove the transmission pan bolts using a socket set.
    • Carefully lower the pan and allow fluid to drain completely.

  3. Replace Filter:

    • Remove the old transmission filter (if applicable).
    • Clean the filter mounting surface.
    • Install the new filter according to manufacturer specifications.

  4. Reinstall Transmission Pan:

    • Clean the pan and apply a new gasket if necessary.
    • Reinstall the transmission pan and tighten bolts to the specified torque.

  5. Add New Fluid:

    • Using a funnel, pour the new Toyota WS transmission fluid into the dipstick tube.
    • Check fluid level with the dipstick as you add fluid, ensuring it is within the appropriate range.

2. Addressing Fault Codes

Symptoms: Check engine light illuminated, harsh shifting.

Steps:

  1. Scan for Codes:

    • Connect the OBD-II scanner and retrieve codes.

  2. Identify the Issue:

    • Research specific DTCs related to transmission issues.

  3. Repair as Necessary:

    • Depending on the code, you may need to replace sensors, solenoids, or other components.

  4. Clear Codes:

    • After repairs, clear the codes with the scanner and take the vehicle for a test drive to ensure the issues are resolved.
Conclusion

While the 2021 Toyota Highlander is generally reliable, being aware of potential transmission issues can help you address them proactively. Regular maintenance, including fluid changes and monitoring for leaks, can mitigate many of these problems. If issues persist after basic troubleshooting, consult a professional technician for further diagnosis and repair.