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how to fix transmission slipping in my Toyota Highlander XU70 (2020-Present)? - Toyota Highlander
Home/Cars/Toyota/Highlander/XU70 (2020-Present)/how to fix transmission slipping in my Toyota Highlander XU70 (2020-Present)?

how to fix transmission slipping in my Toyota Highlander XU70 (2020-Present)?

Toyota Highlander XU70 (2020-Present)

Error Codes
2-4 hours
Time
medium
Difficulty
high
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
585 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix transmission slipping in your 2020-Present Toyota Highlander XU70. Step-by-step guide with tools and procedures.

Affected Component
Transmission
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems.
  • •Allow the engine to cool before opening the transmission pan to prevent burns.

Symptoms

  • •Engine revs higher than normal without corresponding acceleration
  • •Delayed or harsh shifting between gears
  • •Unusual noises coming from the transmission (grinding or whining)
  • •Check Engine Light illuminated
  • •Fluid leaks under the vehicle
  • •Poor fuel economy

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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
  • •Socket set
  • •Torque wrench
  • •Transmission fluid dipstick
  • •Fluid catch pan

Parts Required

  • •Transmission fluid (Toyota ATF WS)
  • •Transmission filter (if applicable)
  • •Transmission pan gasket

Additional Information

Affected Component
Transmission
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
5 items
Parts Required
3 items

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Solution
1. Preparation
  • Tools Required: OBD-II scanner, socket set, torque wrench, transmission fluid dipstick, fluid catch pan.
  • Ensure the vehicle is on a level surface and securely support it using jack stands.
  • Disconnect the battery to prevent electrical shorts while working on the vehicle.
2. Check and Replace Transmission Fluid

  1. Check Fluid Level:

    • Remove the dipstick and wipe it clean. Reinsert and remove again to check the fluid level.
    • If low, add the appropriate type of transmission fluid (usually Toyota ATF WS).

  2. Inspect Fluid Condition:

    • If the fluid is dark, has a burnt smell, or contains debris, it should be replaced.

  3. Fluid Replacement:

    • Place a fluid catch pan under the transmission pan.
    • Remove the transmission pan bolts and carefully lower the pan, allowing fluid to drain.
    • Replace the transmission filter if applicable (usually requires removing the pan).
    • Clean the pan and magnet, then reinstall the pan with a new gasket, tightening to manufacturer torque specifications.
3. Inspect and Repair Components

  1. Examine Cooler Lines:

    • Inspect the transmission cooler lines for any signs of leaks or damage. Replace if necessary.

  2. Test TCM:

    • Reconnect the battery and use the OBD-II scanner to check for TCM error codes. If errors persist, consider reprogramming or replacing the TCM.
4. Check Mechanical Components

  1. Inspect Drive Shafts:

    • Check for excessive play in the drive shafts and CV joints. Replace any worn components.

  2. Test Drive:

    • After all repairs, conduct a test drive to ensure normal operation and that slipping has been resolved.