why is my Tesla Model S Plaid/Refresh (2021-present) making a knocking noise when accelerating?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

471 words

Problem Statement

Diagnose and fix knocking noise during acceleration in Tesla Model S Plaid. Step-by-step guide with symptoms, diagnostic steps, 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 if working underneath.

Symptoms

•Knocking noise when accelerating
•Vibration felt through the vehicle
•Loss of power during acceleration
•Unusual sounds when turning or cornering
•Check for any warning lights illuminated on the dashboard

Diagnostic Steps

1
Inspect the undercarriage for any loose or damaged components.
2
Use a diagnostic tool to scan for error codes related to the drivetrain or suspension.
3
Check the condition of the drive axles and CV joints for wear or damage.
4
Examine the suspension components, including shocks, struts, and bushings.
5
Test drive the vehicle to replicate the noise while monitoring power delivery.
6
Inspect the motor mounts for wear or damage that could lead to movement 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

•Socket set
•Torque wrench
•Diagnostic tool (OBD-II scanner)

Parts Required

•Drive axle(s) (if damaged)
•CV joint(s) (if damaged)
•Motor mounts (if worn)
•Suspension components (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect the undercarriage for any loose or damaged components.
2
Use a diagnostic tool to scan for error codes related to the drivetrain or suspension.
3
Check the condition of the drive axles and CV joints for wear or damage.
4
Examine the suspension components, including shocks, struts, and bushings.
5
Test drive the vehicle to replicate the noise while monitoring power delivery.
6
Inspect the motor mounts for wear or damage that could lead to movement during acceleration.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
Disconnect the battery to avoid electrical issues during the inspection.

2. Inspect and Tighten Components

Sub-steps:
- Use a socket set to check the tightness of all undercarriage components, including bolts on the drive axles and suspension parts.
- Inspect the motor mounts visually for signs of cracking or wear.
- If any components are loose, tighten to the manufacturer’s specified torque settings.

3. Replace Worn Components

Sub-steps:
- If any drive axles or CV joints are found to be damaged, remove them using a socket set and replace with new parts.
- For worn motor mounts, remove the old mounts and install new ones, ensuring alignment with the vehicle’s specifications.
- Replace any damaged suspension components as necessary.

4. Reassemble and Reconnect

Sub-steps:
- Reassemble all components in reverse order of disassembly.
- Reconnect the battery and ensure all electrical connections are secure.
- Double-check all fasteners to ensure they are tightened to specifications.