my Toyota Highlander makes a clunking noise when shifting what should I check

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

601 words

Problem Statement

Learn how to diagnose and fix clunking noise when shifting in 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

•Use gloves and eye protection when handling fluids.
•Ensure the vehicle is supported securely on jack stands before working underneath.
•Disconnect battery before working on electrical systems.
•Ensure vehicle is on a flat surface and secured properly before lifting.

Symptoms

•Clunking noise during gear shifts
•Delayed or harsh shifting
•Vibration felt in the cabin
•Unusual sounds when accelerating or decelerating
•Potential slipping of gears

Diagnostic Steps

1
Inspect the transmission fluid level and condition using the dipstick; check for contamination or burnt smell.
2
Scan the vehicle’s onboard diagnostics (OBD-II) for any error codes related to the transmission.
3
Check for loose or damaged mounts (transmission and engine mounts) that could contribute to clunking sounds.
4
Examine the driveshaft and CV joints for wear, play, or damage.
5
Inspect the suspension components (e.g., control arms, bushings, struts) for any signs of wear or looseness.
6
Test drive the vehicle to replicate the noise and observe the conditions under which it occurs.

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

•Transmission fluid pump
•Funnel
•10mm socket
•Torque wrench
•Socket set
•Jack stands
•Pry bar
•OBD-II scanner

Parts Required

•Transmission fluid
•Engine/transmission mounts
•CV joints (if needed)
•Suspension bushings (if needed)

Related Faults

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Diagnostic Steps

1
Inspect the transmission fluid level and condition using the dipstick; check for contamination or burnt smell.
2
Scan the vehicle’s onboard diagnostics (OBD-II) for any error codes related to the transmission.
3
Check for loose or damaged mounts (transmission and engine mounts) that could contribute to clunking sounds.
4
Examine the driveshaft and CV joints for wear, play, or damage.
5
Inspect the suspension components (e.g., control arms, bushings, struts) for any signs of wear or looseness.
6
Test drive the vehicle to replicate the noise and observe the conditions under which it occurs.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and secured with wheel chocks.
Disconnect the battery to prevent electrical shorts during repairs.

2. Check and Replace Transmission Fluid

Sub-steps:
1. Remove the transmission fluid dipstick and wipe it clean.
2. Insert the dipstick back into the tube, then remove it again to check the fluid level.
3. If low, add the manufacturer-recommended transmission fluid.
4. If fluid is dirty or burnt, proceed to drain and replace it.
Tools Required: Transmission fluid pump, funnel, 10mm socket.
Safety Warnings: Use gloves and eye protection when handling fluids.

3. Inspect and Secure Transmission and Engine Mounts

Sub-steps:
1. Visually inspect all mounts for cracks or signs of wear.
2. Use a torque wrench to tighten any loose bolts to the manufacturer’s specifications.
3. Replace any damaged mounts with new ones.
Tools Required: Torque wrench, socket set.
Safety Warnings: Ensure the vehicle is supported securely on jack stands before working underneath.

4. Examine Driveshaft and CV Joints

Sub-steps:
1. Raise the vehicle on jack stands and inspect the driveshaft for any play or damage.
2. Check CV joints for any signs of wear or leakage.
3. Replace any worn or damaged components.
Tools Required: Jack stands, socket set, pry bar.
Safety Warnings: Ensure the vehicle is securely supported before climbing under.

5. Inspect Suspension Components

Sub-steps:
1. Check all bushings, control arms, and struts for wear or damage.
2. Replace any worn bushings or components as needed.
3. Perform a wheel alignment if suspension components were replaced.
Tools Required: Socket set, pry bar, alignment tools.
Safety Warnings: Allow time for suspension components to settle after replacement before driving.