What transmission issues are frequently experienced with the 2020 Highlander model?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

622 words

Problem Statement

Explore common transmission issues faced by the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component

transmission

Symptoms

•Engine revs without an increase in vehicle speed
•Delayed engagement when shifting from park to drive or reverse
•Unexplained increases in RPM during acceleration
•Noticeable jerking or clunking during gear changes
•Harsh engagement when shifting from park to drive or when accelerating
•Delay in gear engagement when shifting
•A noticeable lag when accelerating from a stop

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
•Ramps or jack stands
•Funnel and clean container
•Wrenches and sockets

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Engine revs without an increase in vehicle speed

•Delayed engagement when shifting from park to drive or reverse

•Unexplained increases in RPM during acceleration

•Noticeable jerking or clunking during gear changes

•Harsh engagement when shifting from park to drive or when accelerating

•Delay in gear engagement when shifting

•A noticeable lag when accelerating from a stop

Solution

Common Transmission Issues in the 2020 Toyota Highlander (Fourth Generation)

The 2020 Toyota Highlander, part of the fourth generation (XU70), has been generally well-received, but like any vehicle, it may experience some transmission-related problems. Here are some frequently reported issues along with symptoms, diagnostic steps, tools required, and repair instructions.

1. Transmission Slipping

Symptoms:

Engine revs without an increase in vehicle speed.
Delayed engagement when shifting from park to drive or reverse.
Unexplained increases in RPM during acceleration.

Diagnostic Steps:

Check Fluid Level and Condition:
- Inspect transmission fluid level using the dipstick (if equipped).
- Examine fluid color and smell; burnt or dark fluid may indicate internal damage.
Scan for Trouble Codes:
- Use an OBD-II scanner to check for any transmission-related codes.
Test Drive:
- Conduct a test drive to replicate the slipping issue under various conditions.

Tools Required:

OBD-II scanner
Transmission fluid dipstick (if applicable)
Ramps or jack stands (for vehicle lift)
Funnel and clean container for fluid inspection

Repair Instructions:

Fluid Replacement:
- If fluid is low, top off with the recommended ATF (Automatic Transmission Fluid).
- If fluid is burnt or contaminated, perform a transmission fluid change.
Transmission Adaptation Reset:
- If the transmission control module (TCM) has adaptive learning, resetting it may solve slipping issues. This can typically be done via the OBD-II scanner.
Inspect Transmission for Internal Damage:
- If problems persist, further inspection of internal components may be necessary. This may require professional service.

2. Harsh Shifting

Symptoms:

Noticeable jerking or clunking during gear changes.
Harsh engagement when shifting from park to drive or when accelerating.

Diagnostic Steps:

Check for Software Updates:
- Verify if the vehicle’s TCM has the latest software updates from a dealership.
Inspect Transmission Fluid:
- Similar to slipping, check fluid levels and condition.
Look for Trouble Codes:
- Use the OBD-II scanner to check for any related trouble codes.

Tools Required:

OBD-II scanner
Transmission fluid dipstick (if applicable)

Repair Instructions:

Update Transmission Software:
- If updates are available, take the vehicle to a Toyota dealer for reprogramming.
Fluid Maintenance:
- If the fluid appears burnt or low, replace it as per manufacturer specifications.
Mechanical Inspection:
- If no software or fluid issues are identified, a deeper mechanical inspection may be needed, including checking for worn synchronizers or damaged internal components.

3. Gear Engagement Delay

Symptoms:

Delay in gear engagement when shifting.
A noticeable lag when accelerating from a stop.

Diagnostic Steps:

Inspect Transmission Fluid Level and Condition:
- As with other issues, check the fluid level and quality.
Evaluate Shift Linkage:
- Inspect the shift linkage for any signs of wear or misalignment.
Scan for Trouble Codes:
- Check for codes related to TCM or transmission performance.

Tools Required:

OBD-II scanner
Wrenches and sockets for linkage inspection
Transmission fluid dipstick

Repair Instructions:

Fluid Change if Necessary:
- Perform a fluid change if the fluid is not within acceptable parameters.
Adjust Shift Linkage:
- If the linkage is misaligned, adjust it according to the service manual instructions.
Professional Diagnosis:
- If the issue continues, consider consulting a professional for a more in-depth diagnostic, as it may involve internal mechanical issues.

Conclusion

While the 2020 Toyota Highlander is a robust vehicle, these are some common transmission issues that may arise. Regular maintenance and timely diagnostic checks will help maintain the health of the transmission. If you are not comfortable performing these diagnostics or repairs, it is advisable to consult with a professional technician or authorized Toyota service center.