This applies to both front and rear drive units in Audi e-tron models. When an internal problem occurs, Audi usually replaces the entire assembly — repairs through the dealership can be very expensive.

Coolant leakage in e-tron drive units happens when the main rotor seal wears out. Over time, coolant can enter the motor instead of being safely collected in the drip reservoir. The first components affected are the rotor bearings. Coolant washes away their lubrication, causing a high-pitched whine that grows louder during acceleration — the earliest sign the drive unit needs attention.

If the leak continues, coolant can reach the stator and damage insulation, triggering warnings about reduced power or potential drive system faults. Because coolant is electrically conductive, once it enters the motor, it can create isolation faults — shorting the high-voltage system to ground. The vehicle may enter protective mode to prevent further damage. Continuing to drive in this condition can seriously harm the motor or inverter, so towing is strongly recommended.

Below you can find our complete Audi e-tron drive unit rebuild and repair kits, including high-quality SKF ceramic bearings, designed to restore reliability and prevent future coolant-related failures.