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

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

545 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 slipping CVT issues in the 2014-2019 Toyota Highlander. 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 radiator or working on the transmission.

Symptoms

•Engine revs without corresponding acceleration
•Unusual engine noise during acceleration
•Check engine light illuminated
•Transmission fluid leaks underneath the vehicle
•Delayed or harsh engagement when shifting gears

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related codes.
2
Check the CVT fluid level and condition; look for discoloration or burnt odor.
3
Inspect for external leaks in the transmission system.
4
Conduct a road test to replicate the slipping condition under various driving scenarios.
5
Assess the condition of the CVT belt and pulleys through visual inspection.
6
Check the transmission cooler for blockages or damage.

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
•Funnel
•Transmission fluid

Parts Required

•Toyota CVT Fluid TC
•CVT filter (if applicable)
•Gasket or sealant for transmission pan

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related codes.
2
Check the CVT fluid level and condition; look for discoloration or burnt odor.
3
Inspect for external leaks in the transmission system.
4
Conduct a road test to replicate the slipping condition under various driving scenarios.
5
Assess the condition of the CVT belt and pulleys through visual inspection.
6
Check the transmission cooler for blockages or damage.

Solution

1. Preparation

Gather tools: OBD-II scanner, socket set, torque wrench, funnel, and transmission fluid.
Ensure the vehicle is parked on a level surface and the engine is turned off.
Disconnect the battery for safety.

2. Inspect and Replace CVT Fluid

Locate the CVT transmission dipstick or fill tube.
Remove the dipstick; wipe it clean and reinsert to check fluid level.
If low, add the recommended CVT fluid (Toyota CVT Fluid TC) using a funnel.
If fluid is dirty or burnt, perform a fluid change:
1. Drain the old fluid by removing the drain plug.
2. Replace the drain plug and torque it to manufacturer specifications (typically around 20 ft-lbs).
3. Refill with new CVT fluid through the fill tube.

3. Check and Replace CVT Filter

Locate the CVT filter (if applicable).
Remove the filter and inspect for debris or clogs.
Replace with a new filter if necessary.

4. Inspect and Repair CVT Components

Remove the transmission pan if needed to access internal components.
Inspect the CVT belt and pulleys for wear.
Replace any damaged components, ensuring proper alignment and tension.

5. Reassemble and Test

Reinstall the transmission pan and torque bolts to the specified torque (usually 10-12 ft-lbs).
Reconnect the battery and start the engine.
Check for leaks and test drive the vehicle to ensure the slipping issue is resolved.