why does my Tesla Model S Original (2012-2020) make a loud humming noise

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

536 words

Problem Statement

Learn how to diagnose and fix a loud humming noise in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems.
•Always use jack stands when working under the vehicle.

Symptoms

•Loud humming noise when accelerating or at constant speeds
•Possible vibration felt in the cabin or steering wheel
•Noise changes with vehicle speed, not engine RPM
•Increased cabin noise at higher speeds
•No warning lights illuminated on the dashboard

Diagnostic Steps

1
Conduct a visual inspection of the electric motor and drivetrain components for any obvious signs of wear or damage.
2
Test drive the vehicle at various speeds to determine if the noise is consistent and if it changes with acceleration or deceleration.
3
Use an OBD-II scanner to check for any stored error codes related to the drivetrain or electric motor.
4
Inspect wheel bearings for play or noise by spinning the wheels and listening for any irregular sounds.
5
Check tire condition and pressures to ensure they are within manufacturer specifications.

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

•Jack stands
•Socket set
•Torque wrench
•OBD-II scanner

Parts Required

•Replacement wheel bearings (if needed)
•Motor mounts (if found damaged)

Related Faults

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Diagnostic Steps

1
Conduct a visual inspection of the electric motor and drivetrain components for any obvious signs of wear or damage.
2
Test drive the vehicle at various speeds to determine if the noise is consistent and if it changes with acceleration or deceleration.
3
Use an OBD-II scanner to check for any stored error codes related to the drivetrain or electric motor.
4
Inspect wheel bearings for play or noise by spinning the wheels and listening for any irregular sounds.
5
Check tire condition and pressures to ensure they are within manufacturer specifications.

Solution

1. Preparation

Tools Required: Jack stands, socket set, torque wrench, OBD-II scanner.
Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
Disconnect the 12V battery to avoid any electrical issues during inspection.

2. Inspect Drivetrain Components

Sub-steps:
1. Raise the vehicle using a jack and secure it with jack stands.
2. Remove the rear wheel covers to access the electric motor and drivetrain components.
3. Visually inspect the motor mounts and connections for any signs of damage or looseness.
4. Check the gear reduction unit for any fluid leaks or abnormal wear.

3. Wheel Bearing Inspection

Sub-steps:
1. Spin each wheel by hand while listening for any grinding or roughness.
2. Check for play in the wheel bearings by grabbing the wheel at the 12 and 6 o'clock positions and moving it back and forth.
3. If noise is detected, the wheel bearing may need replacement.

4. Tire Inspection

Sub-steps:
1. Check tire tread depth and wear patterns; uneven wear could indicate alignment issues.
2. Ensure all tires are inflated to the recommended pressure.

5. Reassemble and Test

Sub-steps:
1. Reattach any removed components and ensure all bolts are torqued to manufacturer specifications.
2. Reconnect the 12V battery.
3. Lower the vehicle and conduct a test drive to verify the noise has been resolved.