why is my Toyota Highlander Third Generation (2014-2019) making a knocking sound when driving

Toyota Highlander Third Generation (2014-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

medium

Severity

3 min read

571 words

Problem Statement

Learn how to diagnose and fix knocking sound issues in Toyota Highlander 2014-2019. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Suspension

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is securely lifted and supported before working underneath.

Symptoms

•Knocking sound that varies with vehicle speed
•Possible vibration felt through the steering wheel or floorboards
•Loss of power during acceleration
•Increased fuel consumption
•Unusual noises when turning or going over bumps

Diagnostic Steps

1
Inspect the vehicle for loose or damaged components in the suspension and steering systems.
2
Perform a visual inspection of the engine and transmission mounts for signs of wear or damage.
3
Check the condition of the drive belts and pulleys for any signs of slippage or wear.
4
Lift the vehicle and check for any worn or damaged CV joints or axles.
5
Scan the vehicle’s onboard diagnostics for any error codes that may indicate engine or transmission issues.

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
•Pry bar
•Flashlight

Parts Required

•Engine mounts (if needed)
•Transmission mounts (if needed)
•Drive belts (if worn)
•CV joints or axles (if damaged)

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Diagnostic Steps

1
Inspect the vehicle for loose or damaged components in the suspension and steering systems.
2
Perform a visual inspection of the engine and transmission mounts for signs of wear or damage.
3
Check the condition of the drive belts and pulleys for any signs of slippage or wear.
4
Lift the vehicle and check for any worn or damaged CV joints or axles.
5
Scan the vehicle’s onboard diagnostics for any error codes that may indicate engine or transmission issues.

Solution

1. Preparation

Tools Required: Jack and jack stands, socket set, torque wrench, pry bar, flashlight
Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Disconnect the battery to prevent any electrical issues during repairs.

2. Inspect and Tighten Suspension Components

Use a socket set to check and tighten all bolts and nuts on the suspension components (control arms, struts, sway bar links).
Inspect for any excessive play or damage in bushings and replace if necessary.

3. Check Engine and Transmission Mounts

Locate the engine and transmission mounts using the vehicle service manual.
Inspect for cracks or deterioration in the rubber mounts.
If damaged, replace the mounts by:
1. Supporting the engine/transmission with a jack.
2. Removing the bolts using a socket set.
3. Replacing with new mounts and torquing to manufacturer specifications.

4. Examine Drive Belts and Pulleys

Visually inspect drive belts for fraying or cracking.
Check the tensioner and pulleys for wear.
Replace any worn belts or pulleys by:
1. Loosening the tensioner with a socket set.
2. Removing the old belt and installing a new one according to the routing diagram.
3. Ensuring proper tension before securing the tensioner.

5. Inspect CV Joints and Axles

Lift the vehicle and remove the wheels for better access.
Check CV boots for tears and ensure the joints are lubricated.
If the CV joints are damaged, replace by:
1. Removing the axle nut with a socket set.
2. Disconnecting the lower control arm if needed.
3. Pulling the axle out of the hub and replacing it with a new one.