how to fix the CVT slipping in my Toyota Highlander Third Generation (2014-2019)

Toyota Highlander Third Generation (2014-2019)

Error Codes

4-8 hours

Time

medium

Difficulty

high

Severity

3 min read

549 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 slipping in your 2014-2019 Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

4-8 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the electrical systems.
•Allow the engine to cool before starting work on the transmission.

Symptoms

•Engine RPMs increase without corresponding acceleration
•Unusual whining or grinding noises from the transmission
•Poor fuel economy
•Check engine light illuminated
•Delayed engagement when shifting from park to drive or reverse

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related faults.
2
Check the transmission fluid level and condition; low or dirty fluid can cause slipping.
3
Inspect the transmission filter for clogs or restrictions.
4
Examine the CVT belt and pulleys for wear or damage.
5
Test the input and output speed sensors for proper function using a multimeter.

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 pump
•Funnel
•Socket set
•Torque wrench
•Multimeter

Parts Required

•CVT fluid (specific to Toyota)
•Transmission filter
•Gasket for transmission pan
•CVT belt and pulleys (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related faults.
2
Check the transmission fluid level and condition; low or dirty fluid can cause slipping.
3
Inspect the transmission filter for clogs or restrictions.
4
Examine the CVT belt and pulleys for wear or damage.
5
Test the input and output speed sensors for proper function using a multimeter.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Tools Required: Transmission fluid pump, funnel, socket set, torque wrench.
Remove the transmission drain plug and drain the old fluid into a suitable container.
Replace the drain plug and torque it to the manufacturer's specifications (typically around 30 ft-lbs).
Using the fluid pump, refill the transmission with the recommended CVT fluid (consult the owner’s manual for specifications).
Start the engine and cycle through the gears to ensure fluid circulation, then recheck the fluid level.

3. Replace Transmission Filter

Remove the transmission pan bolts using the socket set.
Carefully detach the transmission pan and remove the old filter.
Clean the mating surfaces of the pan and transmission case to remove any debris or old gasket material.
Install the new filter and reattach the transmission pan using a new gasket; torque bolts to manufacturer specifications (usually around 10 ft-lbs).

4. Inspect or Replace CVT Belt and Pulleys

If the belt and pulleys show signs of wear or damage, they will need to be replaced.
Remove the CVT drive assembly following the service manual instructions.
Replace the belt and pulleys with new OEM parts.
Reassemble the CVT drive assembly and ensure all components are secure.