why does my Genesis G70 make a thumping noise when I accelerate?

Genesis G70 IG (2017-2023)

Error Codes

3-6 hours

Time

medium

Difficulty

medium

Severity

3 min read

500 words

Problem Statement

Diagnose and fix thumping noise during acceleration in Genesis G70. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Suspension

Estimated Time

3-6 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Thumping noise increases with acceleration
•Noise is more pronounced when turning
•Possible vibration felt through the floor or steering wheel
•Check engine light may be illuminated
•Poor acceleration response or hesitation

Diagnostic Steps

1
Inspect the undercarriage for any loose or damaged components, including exhaust and shields.
2
Check for worn or damaged CV joints or axles by visually inspecting for tears in the rubber boots.
3
Test the engine and transmission mounts for wear or failure by applying engine load and checking for excessive movement.
4
Inspect the tires for uneven wear or damage that could cause noise when accelerating.
5
Use an OBD-II scanner to check for any error codes that may indicate related 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

•Hydraulic lift or jack stands
•Socket set
•Torque wrench
•Engine hoist or jack
•OBD-II scanner

Parts Required

•CV axle(s) (if damaged)
•Engine and transmission mounts
•Exhaust hangers or brackets (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect the undercarriage for any loose or damaged components, including exhaust and shields.
2
Check for worn or damaged CV joints or axles by visually inspecting for tears in the rubber boots.
3
Test the engine and transmission mounts for wear or failure by applying engine load and checking for excessive movement.
4
Inspect the tires for uneven wear or damage that could cause noise when accelerating.
5
Use an OBD-II scanner to check for any error codes that may indicate related issues.

Solution

1. Preparation

Gather required tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Wear safety gloves and goggles for protection.

2. Inspect and Secure Loose Components

Sub-steps:
1. Raise the vehicle using a hydraulic lift or jack stands.
2. Examine the exhaust system for any loose hangers or damaged parts.
3. Tighten any loose bolts or replace damaged brackets.

3. Replace Worn CV Joints/Axles

Sub-steps:
1. Remove the wheel and tire assemblies.
2. Disconnect the lower control arm and any necessary suspension components to access the CV joint.
3. Remove the axle nut using a socket wrench.
4. Pull the CV axle out of the transmission and replace it with a new one.
5. Reassemble by reversing the disassembly steps and torque all fasteners to manufacturer's specifications.

4. Replace Engine/Transmission Mounts

Sub-steps:
1. Secure the vehicle on a lift or jack stands and remove any necessary underbody panels.
2. Support the engine using an engine hoist or jack.
3. Remove the bolts securing the engine and transmission mounts.
4. Replace the failed mounts with new components and reattach all bolts, ensuring to torque to specifications.