why is my Tesla Model S Plaid/Refresh (2021-present) making 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

514 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.
•Allow the vehicle to cool before inspecting or repairing the drivetrain components.

Symptoms

•Knocking noise that increases with acceleration
•Vibration felt through the chassis
•Possible loss of acceleration power
•Unusual tire wear observed
•No warning lights illuminated on the dashboard

Diagnostic Steps

1
Inspect the undercarriage for loose or damaged components.
2
Check the motor mounts for signs of wear or failure.
3
Examine the drive shafts for any signs of damage or misalignment.
4
Conduct a visual inspection of the suspension system, including control arms and bushings.
5
Use an OBD-II scanner to check for any stored error codes related to the drivetrain.

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 stands
•Pry bar
•Universal joint puller

Parts Required

•Motor mounts (if replacement is necessary)
•Drive shaft (if damaged)
•Suspension bushings or control arms (if worn)

Related Faults

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Diagnostic Steps

1
Inspect the undercarriage for loose or damaged components.
2
Check the motor mounts for signs of wear or failure.
3
Examine the drive shafts for any signs of damage or misalignment.
4
Conduct a visual inspection of the suspension system, including control arms and bushings.
5
Use an OBD-II scanner to check for any stored error codes related to the drivetrain.

Solution

1. Preparation

Gather tools and parts necessary for the repair.
Ensure the vehicle is parked on a level surface and engage the parking brake.
Disconnect the battery to prevent electrical issues during repairs.

2. Inspect and Tighten Components

Tools Required: Socket set, torque wrench, jack stands
Lift the vehicle using a jack and secure it with jack stands.
Visually inspect the undercarriage for any loose bolts or components.
Use the torque wrench to tighten all relevant bolts to the manufacturer’s specifications.

3. Replace Motor Mounts (if necessary)

Tools Required: Socket set, torque wrench, pry bar
Remove the covers that protect the motor mounts.
Use the socket set to remove the bolts securing the motor mounts.
Carefully lift the motor slightly using a jack to relieve tension on the mounts.
Remove old mounts and install new ones, tightening to the manufacturer’s torque specifications.

4. Inspect and Replace Drive Shaft (if damaged)

Tools Required: Socket set, torque wrench, universal joint puller
Disconnect the drive shaft from the differential and motor.
Inspect for any bends or cracks; replace if necessary.
If replacing, install the new drive shaft and secure it with the appropriate torque.

5. Inspect Suspension Components

Tools Required: Socket set, pry bar
Check control arms and bushings for signs of wear or damage.
Replace any worn components with new parts, ensuring proper alignment after installation.