Audi E-Tron Quattro Isolation Fault – High-Voltage Battery Contact Module Replacement (2020 – 2023)
Do you have an Audi E-Tron Quattro isolation fault?
Don’t ignore it – book a diagnostic today and get expert help.
The following fault code(s) may be present
P0AA7 – Isolation measuring circuit fault
U059B00 – Invalid data received from battery pack sensor module
Affected Vehicles
Audi E-Tron 50 Quattro
- Audi E-Tron 50 Quattro 2019
- Audi E-Tron 50 Quattro 2020
- Audi E-Tron 50 Quattro 2021
- Audi E-Tron 50 Quattro 2022
- Audi E-Tron 50 Quattro 2023
Audi E-Tron 55 Quattro
- Audi E-Tron 55 Quattro 2019
- Audi E-Tron 55 Quattro 2020
- Audi E-Tron 55 Quattro 2021
- Audi E-Tron 55 Quattro 2022
- Audi E-Tron 55 Quattro 2023
Audi E-Tron Sportback 55
- Audi E-Tron Sportback 55 2020
- Audi E-Tron Sportback 55 2021
- Audi E-Tron Sportback 55 2022
- Audi E-Tron Sportback 55 2023
Audi Q8 E-Tron
- Audi Q8 E-Tron 2022
- Audi Q8 E-Tron 2023
- Audi Q8 E-Tron 2024
- Audi Q8 E-Tron 2025
Audi Q8 Sportback E-Tron
- Audi Q8 Sportback E-Tron 2022
- Audi Q8 Sportback E-Tron 2023
- Audi Q8 Sportback E-Tron 2024
- 2Audi Q8 Sportback E-Tron025
Common Failure Symptoms
- Electrical system malfunction message displayed on dashboard
- Warning lights for high-voltage system faults
- Reduced drive capability or system shutdown
- Vehicle unable to charge or enter ready mode
Do you have an Audi E-Tron Quattro isolation fault?
Don’t ignore it – book a diagnostic today and get expert help.
Audi E-Tron Quattro Diagnostic Report
Audi E-Tron Quattro Repairs
Repairs involved removing the high-voltage battery assembly to access the faulty contactor module. Firstly, our technicians replaced the SX6 module and completed all necessary safety checks. Finally, the system was reassembled and tested to confirm correct isolation readings and functionality.
- Fault traced to defective SX6 contactor module
- Replacement part fitted following repair procedure
- Functionality confirmed after final testing
Resolution
Following repair, the Audi E-Tron Quattro 55 isolation fault was cleared and the high-voltage system returned to operation. Correct insulation resistance values were confirmed, and no further warnings were present.
- Fault memory cleared after final verification
- Isolation levels confirmed stable across HV system
- Reassembly completed with full system checks
Need Help?
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Is the vehicle owned by you or your business?
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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 Cedar Garage 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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