how to fix transmission slipping 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

501 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 in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, 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 the engine and transmission to cool before opening any components.

Symptoms

•Engine RPMs increase without corresponding vehicle acceleration
•Harsh or delayed shifting between gears
•Unusual noises such as grinding or whining during gear changes
•Check engine light illuminated
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan the vehicle's onboard computer for any error codes using an OBD-II scanner.
2
Inspect the transmission fluid level and condition; look for signs of burning or contamination.
3
Check for any visible external leaks around the transmission housing and cooler lines.
4
Examine the transmission filter for blockages or contamination.
5
Test the transmission solenoids with a multimeter to ensure they are functioning properly.

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
•Fluid pump
•Multimeter
•Screwdriver set

Parts Required

•Toyota WS transmission fluid
•Transmission filter and gasket
•Transmission solenoids (if needed)

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Diagnostic Steps

1
Scan the vehicle's onboard computer for any error codes using an OBD-II scanner.
2
Inspect the transmission fluid level and condition; look for signs of burning or contamination.
3
Check for any visible external leaks around the transmission housing and cooler lines.
4
Examine the transmission filter for blockages or contamination.
5
Test the transmission solenoids with a multimeter to ensure they are functioning properly.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is on a level surface and secure it with wheel chocks.
Disconnect the battery to prevent any electrical issues while working.

2. Check and Replace Transmission Fluid

Sub-steps:
- Locate the transmission dipstick and remove it; wipe clean and reinsert to check the fluid level.
- If low, add the correct type of transmission fluid (Toyota WS fluid) through the dipstick tube.
- If the fluid is dirty or burnt, drain the transmission fluid completely using a fluid pump.
- Replace with new fluid, ensuring the correct amount is filled as per manufacturer specifications.

3. Replace Transmission Filter

Sub-steps:
- Remove the transmission pan by unscrewing the bolts; be cautious as fluid may still be present.
- Detach the old filter from the transmission.
- Install the new filter ensuring it is secured properly.
- Clean the pan and replace the gasket before reattaching the pan with the specified torque (typically around 10-12 ft-lbs).

4. Inspect and Replace Solenoids (if necessary)

Sub-steps:
- Access the transmission control module and identify the solenoid pack.
- Disconnect the electrical connectors and unbolt the solenoid assembly.
- Replace any faulty solenoids with new ones, ensuring to connect the wiring correctly.
- Reassemble any components removed for access.