how to fix CVT belt slipping in Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Error Codes

3-5 hours

Time

hard

Difficulty

high

Severity

4 min read

601 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 CVT belt slipping in Toyota Highlander (2020-present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Check engine light illuminated
•Sluggish acceleration or delayed response
•Unusual whining or grinding noises from the transmission
•Increased RPMs without corresponding speed increase
•Poor fuel economy
•Transmission overheating warning

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related codes.
2
Inspect the CVT fluid level and condition; check for contamination or burning smell.
3
Visually inspect the CVT belt and pulleys for wear, damage, or misalignment.
4
Check for any leaks in the CVT system that may cause fluid loss.
5
Test the transmission temperature using a scan tool or infrared thermometer.
6
Verify the operation of the CVT control module and sensors.

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 pump
•Replacement CVT belt
•CVT fluid (Toyota WS fluid recommended)
•Multimeter

Parts Required

•Replacement CVT belt
•Transmission pan gasket (if necessary)
•Toyota WS CVT fluid

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related codes.
2
Inspect the CVT fluid level and condition; check for contamination or burning smell.
3
Visually inspect the CVT belt and pulleys for wear, damage, or misalignment.
4
Check for any leaks in the CVT system that may cause fluid loss.
5
Test the transmission temperature using a scan tool or infrared thermometer.
6
Verify the operation of the CVT control module and sensors.

Solution

1. Preparation

Gather tools and materials:
- OBD-II scanner
- Socket set
- Torque wrench
- Transmission fluid pump
- Replacement CVT belt (if needed)
- CVT fluid (Toyota WS fluid recommended)
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery before starting any electrical work.

2. Inspect and Replace CVT Belt

Remove Engine Cover
- Use a socket set to remove bolts securing the engine cover.
- Lift the cover off and set aside.
Drain CVT Fluid
- Place a drain pan under the transmission pan.
- Remove the transmission fluid drain plug and allow fluid to fully drain.
- Replace the drain plug once fluid has drained.
Remove Transmission Pan
- Use a socket set to remove the bolts securing the transmission pan.
- Carefully detach the pan; clean the mating surfaces and inspect for debris.
Remove Old CVT Belt
- Locate the CVT belt and pulleys.
- Loosen the tension on the belt as per manufacturer specifications.
- Carefully remove the old belt from the pulleys.
Install New CVT Belt
- Place the new CVT belt onto the pulleys in the correct orientation.
- Ensure the belt is seated properly and tensioned according to specifications.

3. Reassemble Components

Reinstall Transmission Pan
- Apply new gasket or RTV sealant as necessary.
- Bolt the transmission pan back in place using a torque wrench to the specified torque settings.
Refill CVT Fluid
- Using a fluid pump, add new Toyota WS CVT fluid through the fill port until proper level is achieved.
- Start the engine and let it run for a few minutes while checking for leaks.
Reconnect Battery
- Reconnect the battery terminals and ensure connections are secure.