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Why does my 2020 Toyota Highlander struggle to shift gears? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Why does my 2020 Toyota Highlander struggle to shift gears?

Why does my 2020 Toyota Highlander struggle to shift gears?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and repair gear shifting issues in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component
Transmission

Symptoms

  • •Difficulty in shifting gears (hard or delayed shifts)
  • •Unusual noise during shifting (grinding or clunking)
  • •Engine RPMs increase without corresponding acceleration
  • •Warning lights on the dashboard (Transmission or Check Engine light)

Diagnostic Steps

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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
  • •Vehicle jack and jack stands
  • •Torque wrench
  • •Basic hand tools (sockets, wrenches, screwdrivers)
  • •Transmission fluid dipstick (if applicable)
  • •Transmission fluid (if needed)
  • •Funnel
  • •Clean rag
  • •Multimeter (for electrical testing)

Additional Information

Affected Component
Transmission
Difficulty
medium
Severity
medium
Tools Required
9 items

Related Faults

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Back to Generation

Diagnosis and Repair of Gear Shifting Issues in a 2020 Toyota Highlander

Symptoms:

  • Difficulty in shifting gears (hard or delayed shifts)
  • Unusual noise during shifting (grinding or clunking)
  • Engine RPMs increase without corresponding acceleration
  • Warning lights on the dashboard (Transmission or Check Engine light)
Step 1: Preliminary Checks
Tools Required:
  • OBD-II Scanner
  • Vehicle jack and jack stands
  • Torque wrench
  • Basic hand tools (sockets, wrenches, screwdrivers)
  • Transmission fluid dipstick (if applicable)
Step 2: Fluid Condition and Level Check
Tools Required:
  • Transmission fluid (if needed)
  • Funnel
  • Clean rag
Steps:

  1. Check Fluid Level:

    • With the engine running and transmission in Park, remove the dipstick.
    • Wipe it clean, reinsert it fully, and remove again to check the level.

  2. Assess Fluid Quality:

    • If the fluid is dark or has a burnt odor, it needs to be replaced.
    • If low, top off with the recommended transmission fluid (consult the owner's manual for specifications).

  3. Perform a Transmission Fluid Change (if required):

    • Drain the old transmission fluid into a pan.
    • Replace the transmission fluid filter (if applicable).
    • Refill with the appropriate amount of new transmission fluid.
Step 3: Mechanical Inspection
Tools Required:
  • Vehicle jack and jack stands
  • Torque wrench
  • Basic hand tools
Steps:

  1. Inspect Transmission Mounts:

    • Lift the vehicle and check for any signs of damage or wear on the transmission mounts.
    • Replace any broken mounts, as they can cause misalignment and shifting issues.

  2. Check Linkage and Cables:

    • Inspect the shift linkage and cables for any binding or damage.
    • Ensure the linkage is securely connected and properly adjusted.

  3. Examine the Transmission Control Module (TCM):

    • If the vehicle is equipped with a TCM, check for any updates or reprogramming requirements.
    • A malfunctioning TCM can cause erratic shifting behavior.
Step 4: Advanced Diagnostics
Tools Required:
  • OBD-II Scanner with live data capabilities
  • Multimeter (for electrical testing)
Steps:

  1. Monitor Live Data:

    • Use the OBD-II scanner to monitor transmission parameters while driving.
    • Look for any discrepancies in data related to gear selection, engine speed, and throttle position.

  2. Check Electrical Connections:

    • Inspect wiring harnesses and connectors leading to the transmission.
    • Use a multimeter to check for proper voltage and continuity in the circuit.

  3. Test Solenoids:

    • If applicable, test the shift solenoids for correct operation. A faulty solenoid can cause shifting issues.
    • Replace any defective solenoids as needed.
Step 5: Final Repair Instructions
Tools Required:
  • Replacement parts (if necessary)
  • Basic hand tools
  • Torque wrench
Repair Steps:

  1. Replace Damaged Components:

    • Based on inspections, replace worn out or damaged transmission mounts, shift cables, or solenoids.

  2. Reprogram TCM (if applicable):

    • If there are issues with the TCM, reprogram it using a compatible scan tool.

  3. Test Drive:

    • After repairs, take the vehicle for a test drive to confirm that the shifting issues have been resolved.
    • Monitor for any abnormal behavior or warning lights.

  4. Final Checks:

    • Recheck the transmission fluid level after the test drive to ensure it's within the proper range.
Conclusion

If the vehicle continues to experience shifting issues despite following these steps, it may require a more in-depth inspection or a visit to a dealership or specialized transmission shop for further diagnostics.