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2021 Model X Plaid Drive Unit Warning and Whining Noise

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Brian F. · rep 0 · May 22, 5:19 AM · 1 replies · solved · Question

Vehicle: 2021 Tesla Model X Plaid

My 2021 Tesla Model X Plaid recently started making a distinct whining noise from what sounds like the rear drive unit, especially noticeable under acceleration. Now, I'm also getting a "Drive Unit Service Required" warning on the display, and I feel a slight reduction in power.

The car still drives, but I'm concerned about potential damage. I haven't hit any major potholes or had any incidents.

Is this a common issue with the Plaid models? What could be causing this type of noise and warning, and how urgent is it to get it looked at?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:19 AM

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ClearTheCode admin answer:

A whining noise from the drive unit, coupled with a "Drive Unit Service Required" warning and reduced power in your 2021 Tesla Model X Plaid, is a serious indication of a mechanical or electrical issue within the drive unit itself. While not necessarily 'common' for all Teslas, drive unit issues can occur and require prompt attention.

Diagnostic Steps & Potential Causes:

  1. Bearing Wear: The most frequent cause of a whining or humming noise from a drive unit is worn bearings within the electric motor or the integrated gearbox. As bearings degrade, they create friction and noise, which can eventually lead to performance issues.
  2. Motor Component Failure: Issues with the electric motor's stator, rotor, or windings can also cause unusual noises and trigger fault codes. This might be accompanied by a burning smell in more severe cases.
  3. Inverter/Power Electronics: The inverter converts DC power from the battery to AC power for the motor. A fault in the inverter or its associated power electronics can lead to drive unit warnings and reduced power, sometimes with an audible whine.
  4. Gearbox Issues: Although less common in electric vehicles compared to ICE cars, the single-speed gearbox integrated into the drive unit can also develop issues, leading to noise and performance problems.

When to See a Shop:

  • Immediate Service is Crucial: This is not a problem to ignore. Continuing to drive with a failing drive unit can lead to catastrophic failure, potentially leaving you stranded and incurring more expensive repairs. The reduced power is the car's way of trying to protect itself.
  • Safety Risk: A failing drive unit can affect the vehicle's handling and power delivery unpredictability, posing a safety risk.
  • Specialized Repair: Drive unit repairs or replacements are complex, require specialized tools, and involve high-voltage systems. This is strictly a job for trained Tesla service technicians. Do not attempt DIY diagnosis or repair.
  • Warranty Check: Your 2021 Model X Plaid is likely still under Tesla's new vehicle limited warranty or drive unit warranty. Schedule service promptly to ensure the issue is addressed under warranty.
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