why is my Tesla Model S Original (2012-2020) making a knocking noise at startup

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

487 words

Problem Statement

Diagnose and fix knocking noise at startup in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Ensure the vehicle is on a flat surface and secured before inspection.

Symptoms

•Knocking noise heard upon startup
•Possible vibrations felt in the cabin
•Check battery health warning on the display
•Reduced performance or sluggish acceleration
•Occasional error messages related to motor performance

Diagnostic Steps

1
Inspect the vehicle's undercarriage for loose components or debris.
2
Check the battery condition using the Tesla app to ensure it is functioning correctly.
3
Use the vehicle's onboard diagnostics to check for error codes related to the powertrain.
4
Examine the motor mounts and suspension components for wear or damage.
5
Listen for the noise while performing a visual inspection of the electric motor and associated hardware.

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
•Inspection mirror
•Flashlight

Parts Required

•Motor mounts (if replacement is needed)
•Fasteners (if any are found to be damaged or missing)

Related Faults

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Diagnostic Steps

1
Inspect the vehicle's undercarriage for loose components or debris.
2
Check the battery condition using the Tesla app to ensure it is functioning correctly.
3
Use the vehicle's onboard diagnostics to check for error codes related to the powertrain.
4
Examine the motor mounts and suspension components for wear or damage.
5
Listen for the noise while performing a visual inspection of the electric motor and associated hardware.

Solution

1. Preparation

Gather tools: Socket set, torque wrench, inspection mirror, flashlight.
Ensure the vehicle is parked on a level surface, and the parking brake is engaged.
Disconnect the vehicle from any charging source for safety.

2. Inspect and Secure Components

Visual Inspection: Examine the undercarriage and motor mounts for any visible signs of wear or loose hardware.
Tighten Loose Bolts: If any bolts or fasteners are found to be loose, use a socket set to tighten them to the manufacturer's torque specifications.
Check for Debris: Remove any debris or foreign objects from around the motor and suspension areas.

3. Motor and Battery Examination

Battery Health Check: Use the Tesla app to check the battery health and any warnings that may indicate issues.
Inspect Motor: If accessible, visually inspect the electric motor for any signs of wear or damage. Look for any abnormal wear patterns on the rotor.

4. Component Replacement (if necessary)

Replace Damaged Parts: If any components are found to be damaged during inspection (e.g., motor mounts or hardware), order replacements and install them according to the manufacturer's specifications.
Reassemble: Ensure all components are reassembled securely and correctly.