why does my Tesla Model S Plaid/Refresh (2021-present) make a knocking noise when I accelerate

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

488 words

Problem Statement

Learn how to diagnose and fix knocking noise 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

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

Symptoms

•Knocking noise during acceleration
•Possible vibration felt through the chassis
•Reduced acceleration performance
•Unusual sounds when turning or changing speed
•Check for any warning lights or error messages on the dashboard

Diagnostic Steps

1
Inspect the vehicle for any visible signs of damage or loose components.
2
Use an OBD-II scanner to check for any stored error codes related to the drivetrain or suspension.
3
Conduct a test drive to replicate the knocking noise and determine under what conditions it occurs.
4
Inspect the suspension components, including bushings and mounts, for wear or damage.
5
Check the drive unit and motor mounts for any signs of failure or loosening.
6
Examine the tires for uneven wear or damage that may cause noise during acceleration.

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

•OBD-II scanner
•Socket set
•Torque wrench
•Jack and jack stands
•Screwdrivers

Parts Required

•Replacement bushings or mounts (as needed)
•Any additional suspension components identified during inspection

Related Faults

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Diagnostic Steps

1
Inspect the vehicle for any visible signs of damage or loose components.
2
Use an OBD-II scanner to check for any stored error codes related to the drivetrain or suspension.
3
Conduct a test drive to replicate the knocking noise and determine under what conditions it occurs.
4
Inspect the suspension components, including bushings and mounts, for wear or damage.
5
Check the drive unit and motor mounts for any signs of failure or loosening.
6
Examine the tires for uneven wear or damage that may cause noise during acceleration.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and turned off.
Disconnect the 12V battery to avoid electrical shorts.

2. Inspect and Tighten Components

Sub-steps:
1. Lift the vehicle using a jack and secure it with jack stands.
2. Inspect the suspension components (control arms, bushings, strut mounts) for any looseness or wear.
3. Tighten any loose bolts or fasteners to the manufacturer's torque specifications.
4. Recheck the drive unit mounts and tighten as necessary.

3. Replace Damaged Parts

Sub-steps:
1. If any worn or damaged components are found during inspection, procure replacements (e.g., bushings, mounts).
2. Remove the affected components using appropriate tools.
3. Install new components, ensuring they are torqued to the manufacturer’s specifications.
4. Reassemble any panels or covers that were removed during the process.

4. Test Drive

Sub-steps:
1. Reconnect the battery and ensure all tools are removed from the vehicle.
2. Conduct a test drive to check for the elimination of the knocking noise.
3. Monitor vehicle performance and listen for any abnormal sounds.