my Toyota Highlander Third Generation (2014-2019) makes a clunking sound when shifting gears

Toyota Highlander Third Generation (2014-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

high

Severity

3 min read

588 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 clunking sound during gear shifts in Toyota Highlander 2014-2019. Step-by-step guide with diagnostic procedures 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.
•Use jack stands when working under the vehicle to prevent accidents.

Symptoms

•Clunking or banging noise during gear shifts
•Delayed or rough shifting between gears
•Possible vibrations felt through the vehicle
•Check engine light may be illuminated
•Fluid leaks under the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related codes.
2
Inspect the transmission fluid level and condition; it should be at the correct level and clean.
3
Check for any visible leaks or damage around the transmission and drivetrain components.
4
Inspect the engine and transmission mounts for wear or damage.
5
Test drive the vehicle to replicate the clunking sound while monitoring shifting performance.
6
Check the universal joints (U-joints) and driveshaft for play 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
•Transmission fluid pump
•Socket set
•Torque wrench
•U-joint press
•Fluid catch pan
•Pry bar

Parts Required

•Transmission fluid
•Transmission filter (if applicable)
•Engine/transmission mounts
•U-joints

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for transmission-related codes.
2
Inspect the transmission fluid level and condition; it should be at the correct level and clean.
3
Check for any visible leaks or damage around the transmission and drivetrain components.
4
Inspect the engine and transmission mounts for wear or damage.
5
Test drive the vehicle to replicate the clunking sound while monitoring shifting performance.
6
Check the universal joints (U-joints) and driveshaft for play or damage.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative battery terminal to prevent electrical shorts.
Ensure the vehicle is on a flat surface and raise it with jack stands for safety.

2. Inspect and Replace Transmission Fluid

Tools Required: Transmission fluid pump, socket set, fluid catch pan.
Check the transmission fluid level using the dipstick; if low, add the appropriate type of transmission fluid (refer to owner's manual for specification).
If the fluid is dirty or burnt, proceed to change the fluid.
- Remove the transmission fluid pan bolts and carefully lower the pan.
- Allow the old fluid to drain completely into the catch pan.
- Clean the pan and replace the filter if applicable.
- Reinstall the pan with the specified torque setting (usually around 12-15 ft-lbs).
- Refill with new transmission fluid through the dipstick tube until the correct level is reached.

3. Inspect and Replace Engine/Transmission Mounts

Tools Required: Socket set, torque wrench, pry bar.
Locate the engine and transmission mounts; visually inspect for cracks or wear.
If damaged, support the engine with a jack and replace the mounts.
- Remove the bolts securing the mounts to the engine and frame.
- Install new mounts, ensuring proper alignment.
- Torque the bolts to the manufacturer’s specifications.

4. Inspect and Replace U-Joints

Tools Required: U-joint press or hammer, socket set.
Inspect U-joints for play by grasping the driveshaft and checking for excessive movement.
If worn, remove the driveshaft by unbolting it from the differential and transmission.
Use a U-joint press to remove the old U-joint and install the new one.
Reinstall the driveshaft and torque the bolts to specification.