Expert Tesla Drive Unit Repair & Rebuild in San Jose Bay Area

At Dynamis Auto, we have specialized in Tesla Drive Unit Repair since 2019. Located in the heart of San Jose, California, we are the Bay Area’s trusted independent service center for Tesla Model S (2012–2020) rear-wheel-drive and Performance models with the Large Drive Unit (LDU). Our expertise is built on hundreds of successful Tesla drive unit rebuilds — we know these motors inside and out.

The Most Common Large Drive Unit Failure: Rotor Shaft Seal Leak

The Large Drive Units installed in all RWD and Performance Model S vehicles (Raven included) suffer from one dominant failure mode: coolant leakage from the rotor shaft seal. Over time (typically 80,000–150,000 miles), the original seal hardens and begins to leak coolant from thermal system into the electric motor housing. Once this happens:

• Coolant contaminates the rotor and stator windings
• Milling noise (“whale whine” or “trolleybus sound”) appears under acceleration
• If left unrepaired, the motor will eventually fail completely

Tesla’s official solution has been full drive unit replacement at a cost of $5,200–$10,000 (plus labor and tax). Many owners are quoted 4–8 weeks of downtime waiting for a remanufactured unit.

At Dynamis Auto, we repair your existing drive unit properly — no need to buy a whole new assembly.

Our Proven Tesla Drive Unit Rebuild Process

We have refined our procedure over 6+ years and hundreds of Large Drive Units. The key difference: we eliminate the root cause permanently without compromising the motor cooling system.

Here’s exactly what we do during every Tesla drive unit rebuild:

1. Complete drive unit removal and full disassembly in our San Jose facility
2. Chemical cleaning and inspection of all internal components
3. Replacement of the failed rotor shaft seal with an improved design that eliminates future leakage
4. Replacement of all drive unit bearings with the exact same high-performance bearings Tesla uses in current production electric motors (ABEC-5 or better, C3 clearance, ceramic hybrid available as upgrade)
5. Replacement of inverter seals and coolant manifold O-rings
6. Full gearbox oil change using Tesla-approved Raven-spec oil (or Redline 75W85 as preferred by many owners for reduced noise)
7. Precision reassembly with proper torque specs and alignment
8. Extended test drive and diagnostic verification

The result: your drive unit leaves our shop better than new.

Why Our Tesla Drive Unit Repair Is Superior to Tesla’s Replacement Unit

• We fix the design flaw that causes the leak — Tesla reman units still use the original problematic seal design
• We use the same (or better) bearings Tesla currently specifies for Plaid and Cybertruck motors
• Fresh oil and seals mean zero contamination risk
• Most importantly: after our rebuild, owners almost never see drive unit issues again

Our failure rate after repair is under 1% — dramatically lower than Tesla’s own remanufactured units.

Warranty You Can Trust

Every Dynamis Auto Tesla drive unit rebuild comes with:

6 months / 10,000 miles warranty — whichever comes first

This is a real warranty backed by a shop that has been serving Bay Area Tesla owners since 2019. We stand behind our work.

Real Customer Results

• 2016 Model S 85 — 145,000 miles, severe milling noise → Rebuilt in 5 business days → Silent again, 18 months later still perfect
• 2017 Model S P100D — leaking coolant into motor → Our rebuild + ceramic hybrid bearings → Owner reports quieter than new
• 2018 Model S 100D Raven — early seal leak at 92,000 miles → Repaired before damage occurred → Saved customer $15,000+ vs Tesla replacement

Ready to Fix Your Tesla Drive Unit the Right Way?

If your Model S is making milling/whining noises, showing coolant in the motor housing on inspection, or you simply want to prevent future failure, contact Dynamis Auto today.

📍 San Jose, Bay Area (serving San Francisco, East Bay, South Bay, Peninsula) 📞 Call or text: (408) 580–9975

Maintenance scheduling and free diagnostics for leaking drive units 🔧 Typical turnaround: 4–7 business days

Don’t pay Tesla $6,000+ for a replacement unit with the same design flaw.

Get it repaired once. Get it repaired right.

Dynamis Auto — Bay Area Tesla Drive Unit Specialists Since 2019