how to fix transmission jerking issue 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

590 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 jerking issues 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 to cool down before opening the transmission or working on any hot components.

Symptoms

•Jerking or shuddering during acceleration
•Delayed or harsh shifting between gears
•Unusual noise when shifting
•Check engine light illuminated
•Decreased fuel efficiency

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition (color, smell).
3
Inspect the transmission filter for clogging or damage.
4
Examine the transmission mounts for wear or damage.
5
Test the transmission control module (TCM) for proper function.
6
Look for any external leaks around the transmission area.

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
•Multimeter
•Transmission fluid catch pan
•Funnel

Parts Required

•Transmission fluid (ATF WS)
•Transmission filter
•Gasket for transmission pan
•Transmission mounts (if needed)
•Transmission control module (if needed)

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Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner.
2
Check the transmission fluid level and condition (color, smell).
3
Inspect the transmission filter for clogging or damage.
4
Examine the transmission mounts for wear or damage.
5
Test the transmission control module (TCM) for proper function.
6
Look for any external leaks around the transmission area.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

Locate the transmission dipstick and remove it.
Check fluid level: If low, add the appropriate type of transmission fluid (typically ATF WS for Toyota).
Inspect fluid condition: If dark or burnt, proceed to replace.
Drain the old fluid: Remove the transmission drain plug and allow fluid to drain completely into a catch pan.
Replace the transmission filter: Remove the transmission pan, replace the filter, and use a new gasket.
Reinstall the transmission pan: Torque the bolts to the manufacturer’s specifications (usually around 10-12 ft-lbs).
Refill with new transmission fluid: Use a funnel to add fresh fluid through the dipstick tube.
Start the engine and let it run for a few minutes, then shift through all gears.

3. Inspect and Replace Transmission Mounts (if necessary)

Locate the transmission mounts: Typically found securing the transmission to the vehicle frame.
Inspect for wear: Check for cracks or excessive rubber deterioration.
Remove the bolts securing the old mounts using a socket set.
Install new mounts: Position them correctly and torque the bolts to the manufacturer’s specifications.

4. Check and Repair Transmission Control Module (if necessary)

Locate the TCM (usually under the dashboard or near the transmission).
Inspect for corrosion or loose connections: Ensure all electrical connections are secure.
Test the TCM with a multimeter to ensure it’s functioning correctly.
Replace the TCM if faulty, following the manufacturer’s installation procedures.