why does my Toyota Highlander XU70 (2020-Present) feel like it's slipping when driving

Toyota Highlander XU70 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

553 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 issues in the 2020-present Toyota Highlander XU70. Step-by-step guide with diagnostic procedures and repair instructions.

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 engine to cool before opening the transmission.

Symptoms

•Slipping sensation during acceleration
•Unusual engine revving without corresponding vehicle speed increase
•Delayed engagement when shifting from park to drive/reverse
•Check engine light illuminated
•Fluid leaks under the vehicle
•Increased engine RPM while driving at a constant speed

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics using an OBD-II scanner for any transmission-related error codes.
2
Check the transmission fluid level and condition (color, smell).
3
Inspect for any visible leaks around the transmission and under the vehicle.
4
Test drive the vehicle while monitoring the transmission response and behavior.
5
Conduct a visual inspection of the transmission mounts for any signs of wear or damage.
6
If equipped, check the operation of the transmission control module (TCM) and its connections.

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
•Funnel
•Torque wrench
•Socket set
•Screwdriver
•Jack stands
•Multimeter
•Wiring harness connector cleaner

Parts Required

•Transmission fluid
•Transmission filter (if applicable)
•Gasket for transmission pan
•Transmission mounts (if damaged)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics using an OBD-II scanner for any transmission-related error codes.
2
Check the transmission fluid level and condition (color, smell).
3
Inspect for any visible leaks around the transmission and under the vehicle.
4
Test drive the vehicle while monitoring the transmission response and behavior.
5
Conduct a visual inspection of the transmission mounts for any signs of wear or damage.
6
If equipped, check the operation of the transmission control module (TCM) and its connections.

Solution

1. Preparation

Gather tools and materials.
Park the vehicle on a level surface and set the parking brake.
Allow the engine to cool if it has been running.

2. Check and Replace Transmission Fluid

Tools Required: Transmission fluid dipstick, funnel, transmission fluid (as specified in the owner's manual), torque wrench.
Remove the transmission dipstick and check the fluid level and condition.
If low, add the appropriate type of transmission fluid as per specifications.
If the fluid is dirty or burnt, drain the transmission fluid completely.
Replace with fresh transmission fluid, ensuring to use the correct type and viscosity.
Torque the transmission pan bolts to the manufacturer's specifications.

3. Inspect and Replace Transmission Filter (if applicable)

Tools Required: Socket set, screwdriver, new transmission filter, gasket.
Remove the transmission pan by loosening bolts and carefully lowering it.
Remove the old filter and replace it with a new one.
Clean the pan and replace the gasket before reinstalling the pan.

4. Check Transmission Mounts

Tools Required: Jack stands, socket set.
Lift the vehicle and support it securely on jack stands.
Inspect the transmission mounts for cracks or degradation; replace if necessary.

5. Reconnect TCM and Inspect Wiring

Tools Required: Multimeter, wiring harness connector cleaner.
Disconnect and inspect the transmission control module (TCM) connector for corrosion or damage.
Clean and reconnect the TCM connector and check for proper voltage and ground using a multimeter.