why does my Toyota Highlander make a knocking noise when accelerating

Toyota Highlander XU70 (2020-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

486 words

Problem Statement

Learn to diagnose and fix knocking noise during acceleration in Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, 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.
•Use appropriate safety gear and ensure the vehicle is securely lifted before working underneath.

Symptoms

•Knocking sound during acceleration
•Vibration felt in the steering wheel or floorboard
•Decreased acceleration performance
•Unusual tire wear patterns
•Check engine light illuminated (possibly related)

Diagnostic Steps

1
Inspect the engine mounts for wear or damage.
2
Check the transmission fluid level and condition.
3
Examine the CV joints and axles for signs of wear or damage.
4
Inspect suspension components, including struts and bushings.
5
Scan for error codes using an OBD-II scanner to identify any related faults.

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
•Jack and jack stands
•OBD-II scanner

Parts Required

•Engine mounts (if damaged)
•CV joint or axle (if necessary)
•Suspension components (if worn)

Related Faults

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Solution

1. Preparation

Gather tools and components needed for the repair.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery (negative terminal) for safety.

2. Inspect and Replace Engine Mounts

Remove the engine cover (if equipped):
- Use a socket set to remove bolts securing the cover.
Support the engine with a jack and a wooden block to prevent it from falling.
Remove the old engine mounts:
- Locate the engine mounts and use a socket set to remove the mounting bolts.
- Replace with new mounts, ensuring correct orientation.
Torque the bolts to the manufacturer’s specifications (check service manual for torque values).

3. Check and Replace CV Joints and Axles

Lift the vehicle using a jack and secure it with jack stands.
Inspect CV joints for any tears or grease leakage:
- If damaged, remove the axle nut using a socket set.
- Disconnect the lower control arm to free the axle.
- Replace the CV joint or axle as necessary.
Reassemble and torque the axle nut to specifications.

4. Inspect and Repair Suspension Components

Visual inspection of struts and bushings:
- Look for any signs of wear, cracks, or fluid leaks.
Replace any worn components:
- Use a socket set to remove and replace struts or bushings as necessary.
Recheck alignment after replacing suspension components.