my Tesla Model S Plaid/Refresh (2021-present) has a knocking sound when accelerating what's wrong

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

461 words

Problem Statement

Learn how to diagnose and fix the knocking sound during acceleration in Tesla Model S Plaid. 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

•Allow the vehicle to cool before working on the suspension.
•Ensure the vehicle is securely lifted and supported on jack stands before working underneath it.

Symptoms

•Knocking sound audible during acceleration
•Possible vibration felt through the chassis
•Decreased acceleration performance
•Unusual noises when turning
•Potential warning lights on the dashboard

Diagnostic Steps

1
Inspect the vehicle's undercarriage for any loose or damaged components.
2
Check for any error codes using the Tesla diagnostic tool or an OBD-II scanner.
3
Examine the suspension components for wear, such as bushings and control arms.
4
Review the drivetrain for any signs of damage or misalignment.
5
Test drive the vehicle to replicate the noise and determine its source more accurately.

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
•Jack stands

Parts Required

•Replacement control arms (if worn)
•Replacement bushings (if worn)
•Replacement driveshaft (if damaged)

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Diagnostic Steps

1
Inspect the vehicle's undercarriage for any loose or damaged components.
2
Check for any error codes using the Tesla diagnostic tool or an OBD-II scanner.
3
Examine the suspension components for wear, such as bushings and control arms.
4
Review the drivetrain for any signs of damage or misalignment.
5
Test drive the vehicle to replicate the noise and determine its source more accurately.

Solution

1. Preparation

Gather tools and parts required for the repair.
Park the vehicle on a flat surface and engage the parking brake.

2. Inspect Suspension Components

Tools Required: Socket set, torque wrench, pry bar
Sub-steps:
1. Lift the vehicle using a jack and secure it with jack stands.
2. Remove the front and rear wheel assemblies to access suspension components.
3. Inspect control arms, bushings, and sway bar links for any signs of wear or damage.
4. Replace any worn or damaged components with OEM parts, ensuring proper alignment.

3. Examine Drivetrain

Tools Required: Torque wrench, appropriate socket set
Sub-steps:
1. Inspect the driveshaft for any signs of damage or play.
2. Check the motor mounts for deterioration or failure.
3. Tighten any loose bolts on the drivetrain components to manufacturer specifications.
4. If a component is found damaged, replace it with a genuine Tesla part.

4. Final Assembly

Tools Required: Torque wrench
Sub-steps:
1. Reinstall the wheel assemblies and lower the vehicle.
2. Torque all wheel bolts to manufacturer specifications (typically around 120 ft-lbs).
3. Perform a final inspection to ensure all components are secured properly.