Audi e-tron (2019-2023) Rear Motor Repair
Electrical System Fault
Loud whining / milling noise from rear drive unit (light load and overrun)
Suspected rear motor failure (post-warranty)
The following fault code(s) may be present
P0AA600 – Hybrid/EV battery voltage system isolation fault
P0C17 – Drive motor “A” position sensor not learned
P0C05 – Drive motor “A” phase U-V-W circuit/open
P0C11 / P0C12 / P0C13 – Drive motor “A” inverter phase U/V/W issues
Do you have an Audi e-tron with an electrical system fault or drivetrain noise?
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Parts Repaired or Replaced
- Rear drive unit
- Internal bearings and seals
Affected Vehicles
Audi e-tron
- Audi e-tron 2019
- Audi e-tron 2020
- Audi e-tron 2021
- Audi e-tron 2022
- Audi e-tron 2023
Common Failure Symptoms
- Electrical system warning messages and reduced/disabled drive
- High-voltage isolation fault warnings
- Whining or milling noise from the rear drive unit under load or on overrun
- Stored inverter/motor phase and position-sensor related fault codes
Audi e-tron Diagnostic Report
Initially, we completed a road test to confirm the reported noise and verified a loud whining/milling sound on light load and overrun. Subsequently, with the vehicle raised we inspected the rear undertray area and coolant catch tank, then ran the drive unit and used a stethoscope to pinpoint the noise source.
Further analysis confirmed the noise was originating from the rear drive unit and the vehicle had multiple stored high-voltage isolation and motor/inverter-related fault codes consistent with an internal drive unit issue.
- Road test completed to reproduce the concern and verify operating conditions
- Workshop checks performed to localise the noise to the rear drive unit
- Fault code set reviewed to support the diagnosis and define repair scope
Audi e-tron Repairs
First, we removed and stripped the rear drive unit for internal inspection. Next, we identified wear consistent with the reported noise and replaced internal bearings and seals as part of the repair. Finally, we reassembled the unit, vacuum-filled the cooling system, resealed, refitted, and carried out extended validation testing.
- Stripped the drive unit and inspected internal components for damage and wear
- Replaced internal bearings and seals as part of the overhaul
- Reassembled, vacuum-filled coolant system, road tested, and cleared fault codes
Resolution
The vehicle was returned to service following reassembly and validation. After an extended road test, the drivetrain noise was no longer present and the fault codes were cleared.
- Extended road test completed to confirm normal operation
- Fault codes cleared following repair
- Rear drive unit noise resolved under the original load/overrun conditions
Need Help?
Are you an independent garage, dealership, warranty, fleet or insurance business?
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Is the vehicle owned by you or your business?
Have you been advised the battery or component needs replacing on your vehicle?
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Do LKQ Electriq repairs have a warranty?
High Voltage System Repairs
Repairs involving high voltage systems typically include a 12-month, unlimited mileage warranty, offering you complete peace of mind.*
Lifetime Guarantee
All work carried out at LKQ Electriq is backed by our lifetime workmanship guarantee.
*Terms and conditions apply. Please consult a Service Advisor to confirm the specific warranty details for your vehicle prior to booking.
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