Learn about common transmission shifting issues in the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.
Affected Component
Transmission
Symptoms
•Rough Shifting
•Delayed Engagement
•Unusual Noise
•Warning Lights
•Slipping Gears
Diagnostic Steps
1
2
3
4
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
Common Transmission Shifting Problems in a 2020 Toyota Highlander
The 2020 Toyota Highlander, part of the fourth generation (XU70), may exhibit several common transmission shifting issues. These problems can manifest as rough shifting, delayed engagement, or unexpected downshifts. Below, we will outline the symptoms, diagnostic steps, tools required, and repair instructions for these issues.
Common Symptoms
Rough Shifting: The vehicle may feel like it is jerking or clunking during gear changes.
Delayed Engagement: There may be a noticeable delay when shifting from park to drive/reverse.
Unusual Noise: Grinding or whining noises may occur during shifting.
Warning Lights: The check engine light or transmission warning light may illuminate on the dashboard.
Slipping Gears: The transmission may unexpectedly shift out of gear while driving.
Tools Required
OBD-II Scanner
Transmission fluid dipstick
Torque wrench
Socket set (metric)
Screwdrivers (flat and Phillips)
Transmission fluid (ATF WS)
Clean rags
Vehicle ramps or jack stands
Safety glasses and gloves
Multimeter (for electrical diagnostics)
Repair Instructions
1. Transmission Fluid Change
If fluid condition is poor:
Step 1: Lift the vehicle and secure it on jack stands.
Step 2: Locate the transmission drain plug and place a drain pan under it.
Step 3: Remove the drain plug and allow the fluid to completely drain.
Step 4: Replace the drain plug using a torque wrench to the manufacturer's specification.
Step 5: Remove the fill plug and use a funnel to add new ATF WS fluid until it reaches the proper level.
Step 6: Reinstall the fill plug and start the vehicle. Cycle through the gears and check the fluid level again, adding more if necessary.
2. Check and Repair Electrical Connections
If there are DTCs indicating electrical issues:
Step 1: Disconnect the battery's negative terminal to avoid electrical shorts.
Step 2: Inspect the wiring harness to the TCM for frayed wires or loose connections.
Step 3: Use a multimeter to test the TCM’s input and output signals.
Step 4: Repair or replace any damaged components as necessary.
Step 5: Reconnect the battery and clear any DTCs with the OBD-II scanner.
3. TCM Reset
If TCM issues are suspected:
Step 1: Disconnect the battery for about 10-15 minutes to reset the TCM.
Step 2: Reconnect the battery and take the vehicle for a test drive to see if symptoms persist.
4. Transmission Replacement or Rebuild
If the transmission is slipping or severely damaged:
Step 1: Consult the repair manual for detailed steps on removing the transmission.
Step 2: Disconnect the battery and drain the transmission fluid as previously described.
Step 3: Remove any components obstructing access to the transmission (e.g., exhaust, driveshaft).
Step 4: Unbolt the transmission from the engine and carefully slide it out.
Step 5: Evaluate the condition of internal components and replace with a rebuild kit or a new transmission as necessary.
Step 6: Reinstall the transmission and all removed components in reverse order, ensuring proper torque specifications.
Conclusion
While the 2020 Toyota Highlander is generally reliable, issues with transmission shifting can arise. By following the outlined diagnostic steps and repair instructions, you can pinpoint the cause of the shifting problems and take appropriate corrective measures. Always consult the vehicle's repair manual for specific torque specifications and procedures. If problems persist after basic troubleshooting, it may be best to seek assistance from a professional automotive technician.
