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

Toyota Highlander Third Generation (2014-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

3 min read

554 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

3-5 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 starting work.

Symptoms

•Engine revs higher than usual without corresponding acceleration
•Delayed or harsh shifting between gears
•Check engine light illuminated
•Fluid leaks under the vehicle
•Burning smell from the transmission area
•Unusual noises when changing gears

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect for external leaks or damage to the transmission case.
4
Test the transmission solenoids for proper operation using a multimeter.
5
Verify proper operation of the transmission control module (TCM) if applicable.
6
Check for any software updates or reprogramming needs for the TCM.

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
•Multimeter
•Socket set
•Transmission fluid pump
•Funnel

Parts Required

•Transmission fluid (Toyota Type T-IV)
•Transmission filter
•Transmission pan gasket
•Transmission solenoids (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any transmission-related trouble codes.
2
Check the transmission fluid level and condition (color and smell).
3
Inspect for external leaks or damage to the transmission case.
4
Test the transmission solenoids for proper operation using a multimeter.
5
Verify proper operation of the transmission control module (TCM) if applicable.
6
Check for any software updates or reprogramming needs for the TCM.

Solution

1. Preparation

Gather tools and parts required.
Ensure the vehicle is on a level surface and securely lifted using jack stands.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission dipstick and wipe it clean.
2. Insert the dipstick back and remove it again to check fluid level.
3. If low, add the correct type of transmission fluid (Toyota Type T-IV).
4. If the fluid is dark or has a burnt smell, prepare to drain and replace it.

Tools Required:

Transmission fluid pump
Funnel
Socket set

3. Inspect and Replace Transmission Filter

Sub-steps:
1. Remove the transmission pan using a socket set, allowing fluid to drain into a container.
2. Replace the old transmission filter with a new one.
3. Clean the pan and inspect for metal shavings or debris.
4. Reinstall the pan with a new gasket, torquing bolts to the manufacturer's specifications (usually around 10-12 ft-lbs).

4. Test and Replace Solenoids (If Necessary)

Sub-steps:
1. Access the transmission solenoids by removing the transmission valve body if required.
2. Test solenoids with a multimeter; replace any that are out of specifications.
3. Reassemble the valve body and all components removed during the process.

5. Reprogram Transmission Control Module (If Necessary)

Sub-steps:
1. Use a compatible scan tool to check for software updates for the TCM.
2. Follow the prompts to update or reprogram the TCM as necessary.