my Genesis G70 has a knocking sound when driving over bumps what's wrong

Genesis G70 1st Gen (2018-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

553 words

Problem Statement

Learn how to diagnose and fix a knocking sound in the suspension of your Genesis G70. 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

•Always use jack stands when working under the vehicle.
•Allow the engine to cool before starting work to avoid burns.

Symptoms

•Knocking or clunking noise when driving over uneven surfaces
•Possible vibration felt through the steering wheel
•Decreased ride quality or comfort
•Uneven tire wear
•Visual inspection may reveal damaged or worn suspension parts

Diagnostic Steps

1
Perform a visual inspection of the suspension components, including struts, shocks, and control arms.
2
Check for loose or damaged hardware, such as bolts and bushings.
3
Test the suspension by pushing down on the vehicle at each corner and observing if it rebounds smoothly.
4
Inspect the sway bar links and bushings for wear or damage.
5
Utilize a chassis ear or similar tool to identify the location of the noise while driving over bumps.

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
•Chassis ear or noise-detection tool

Parts Required

•Replacement struts or shocks (if needed)
•Control arm or sway bar link (if needed)
•New hardware (nuts and bolts as necessary)

Related Faults

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Diagnostic Steps

1
Perform a visual inspection of the suspension components, including struts, shocks, and control arms.
2
Check for loose or damaged hardware, such as bolts and bushings.
3
Test the suspension by pushing down on the vehicle at each corner and observing if it rebounds smoothly.
4
Inspect the sway bar links and bushings for wear or damage.
5
Utilize a chassis ear or similar tool to identify the location of the noise while driving over bumps.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the battery to avoid any electrical shorts during the repair.

2. Lift the Vehicle

Use a jack to lift the front or rear of the vehicle, depending on where the knocking sound is originating.
Secure the vehicle with jack stands to ensure safety.

3. Inspect and Replace Components

Inspection:
- Check the condition of the struts or shocks for oil leakage or damage.
- Inspect control arm bushings and ball joints for wear.
Replacement:
- If any part is found to be defective, replace it with a new part.
  - For struts/shocks:
    1. Remove the strut assembly by unbolting it from the top mount and lower control arm.
    2. Install the new strut/shock in reverse order, ensuring proper torque specifications are followed (typically 30-50 lb-ft for strut bolts).
  - For control arms or sway bar links:
    1. Unbolt the old control arm or sway bar link using a socket set.
    2. Install the new component and torque the bolts to the manufacturer’s specifications.

4. Reassemble and Lower the Vehicle

Reconnect any components that were removed during the inspection and replacement.
Lower the vehicle back to the ground carefully.

5. Final Checks

Reconnect the battery.
Check the alignment of the wheels if suspension components were replaced, as they may affect vehicle handling.