why does my Toyota Highlander make a knocking noise when I accelerate

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

478 words

Problem Statement

Learn how to diagnose and fix knocking noise during acceleration in 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

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before working near it.

Symptoms

•Knocking noise when accelerating
•Noise intensifies with increased speed
•Possible vibrations felt in the cabin
•Uneven tire wear may be observed
•Reduced performance or responsiveness during acceleration

Diagnostic Steps

1
Inspect the undercarriage for loose or damaged components.
2
Check engine mounts for wear or damage.
3
Examine the suspension system, including struts and bushings, for signs of wear.
4
Test drive the vehicle to replicate the noise and determine its source.
5
Use a stethoscope or mechanic’s stethoscope to isolate the noise location.
6
Inspect the CV joints and axles for any signs of damage or wear.

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

•Socket set
•Torque wrench
•Pry bar
•Jack and jack stands
•Mechanic's stethoscope

Parts Required

•Engine mounts (if worn)
•Suspension components (if damaged)
•CV joints/axles (if necessary)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the undercarriage for loose or damaged components.
2
Check engine mounts for wear or damage.
3
Examine the suspension system, including struts and bushings, for signs of wear.
4
Test drive the vehicle to replicate the noise and determine its source.
5
Use a stethoscope or mechanic’s stethoscope to isolate the noise location.
6
Inspect the CV joints and axles for any signs of damage or wear.

Solution

1. Preparation

Gather tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the battery for safety if working near electrical components.

2. Inspect and Replace Engine Mounts

Tools Required: Socket set, torque wrench, pry bar
Sub-steps:
1. Use the socket set to remove the bolts securing the engine mounts.
2. Carefully lift the engine slightly using a jack with a wooden block to avoid damage.
3. Remove the old engine mounts and install the new ones.
4. Torque the bolts to the manufacturer’s specifications.

3. Check Suspension Components

Tools Required: Jack and jack stands, torque wrench
Sub-steps:
1. Lift the vehicle and secure it on jack stands.
2. Inspect the struts, control arms, and bushings for wear or damage.
3. Replace any defective components as needed.
4. Reassemble and torque all fasteners to specifications.

4. Inspect CV Joints and Axles

Tools Required: Socket set, pry bar
Sub-steps:
1. Remove the wheel and brake assembly for access to the CV joint.
2. Inspect the CV joint boots for tears or leaks.
3. If damage is found, remove the axle and replace it with a new one.
4. Reinstall the wheel and brake assembly, and torque all bolts to specifications.