my Toyota Highlander has a knocking noise when driving over bumps, what could it be?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

492 words

Problem Statement

Learn how to diagnose and fix knocking noise in the suspension of your Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Suspension

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is securely supported on jack stands before working underneath.
•Disconnect the battery if working near electrical components.

Symptoms

•Knocking noise when driving over bumps
•Possible vibration felt in the cabin
•Uneven tire wear
•Poor handling or stability
•Squeaking or creaking noises while turning

Diagnostic Steps

1
Inspect suspension components for visible damage or wear, including struts, shocks, and bushings.
2
Check for loose or damaged hardware in the suspension assembly.
3
Conduct a bounce test on the vehicle to assess shock absorber performance.
4
Examine the undercarriage for any debris or obstacles that may cause noise.
5
Inspect the tires for signs of uneven wear or damage that could contribute to noise.

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

•Jack and jack stands
•Socket set
•Torque wrench
•Bushing press (if replacing bushings)
•Screwdrivers

Parts Required

•New struts or shocks (if necessary)
•Replacement bushings (if necessary)
•New hardware (if necessary)

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Diagnostic Steps

1
Inspect suspension components for visible damage or wear, including struts, shocks, and bushings.
2
Check for loose or damaged hardware in the suspension assembly.
3
Conduct a bounce test on the vehicle to assess shock absorber performance.
4
Examine the undercarriage for any debris or obstacles that may cause noise.
5
Inspect the tires for signs of uneven wear or damage that could contribute to noise.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and engage the parking brake.
Wear safety glasses and gloves.

2. Raise the Vehicle

Use a jack to lift the vehicle at the designated lift points.
Secure with jack stands for safety.

3. Inspect and Replace Components

Struts/Shocks:
- Remove the wheel for access.
- Inspect the strut or shock for leaks or physical damage.
- If damaged, unbolt the strut/shock from the top and bottom mounts.
- Install the new strut/shock, ensuring proper torque specifications (typically 15-20 ft-lbs for the top mount and 40-50 ft-lbs for the bottom).
Bushings:
- Check control arm bushings for cracks or deterioration.
- If worn, remove the control arm and replace the bushings, using a bushing press if necessary.
Hardware:
- Inspect all bolts and nuts for tightness. Replace any that are damaged or stripped.
- Torque to manufacturer's specifications.

4. Reassemble and Lower Vehicle

Reattach the wheel and tighten lug nuts in a crisscross pattern to the specified torque (typically 76-80 ft-lbs).
Carefully lower the vehicle back to the ground.

5. Final Inspection

Conduct a visual check of all components to ensure proper installation.
Test drive the vehicle to confirm the knocking noise has been resolved.