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Service Bulletin

2021-2023 Audi 48V Electrical System Warning U046900

If your 2021-2023 Audi, including the Audi Q8, displays a '48V vehicle electrical system warning' or stores DTC U046900, this manufacturer communication (NHTSA ID 10247506) provides crucial information. Understand the symptoms, diagnostic codes, and recommended actions for this electrical system…

Byeditor marcus weber2022 Audi Q8
2022 Audi Q8 — Audi Q8 electrical system warning
Editorial illustration generated for this article.
U04690048V vehicle electrical system warningAudi U046900Audi Q8 48V electrical system warningAudi A6 48V electrical system warningAudi A7 48V electrical system warningAudi Q7 48V electrical system warningAudi S8 48V electrical system warningAudi A6 allroad 48V electrical system warningAudi A8 L e 48V electrical system warning

Also applies to

Audi A6
2021–2023
Audi A6 allroad
2021–2023
Audi A7
2021–2023
Audi A8 L e
2021
Audi Q7
2021–2023
Audi Q8
2021, 2023
▸ Show 1 more
Audi S8
2021–2022

Symptoms of the 48V Electrical System Warning

Owners of affected 2021-2023 Audi vehicles, including the Audi Q8, may experience a "48V vehicle electrical system warning" message displayed in the instrument cluster. This warning indicates a potential problem with the vehicle's 48-volt electrical system, which powers various components. If you notice an Audi Q8 electrical system warning, it's important to have it checked.

Diagnostic Trouble Code (DTC) U046900

When the "48V vehicle electrical system warning" appears, a specific diagnostic trouble code (DTC) U046900 is typically stored in the Engine Control Module (ECM). This code signifies an "Invalid Data Received from Battery Energy Control Module 'A'" or similar communication fault related to the 48V system. The presence of DTC U046900 helps technicians pinpoint the area of concern within the electrical system.

Diagnosis and Trigger Conditions

This manufacturer communication, identified by NHTSA ID 10247506, addresses situations where the "48V vehicle electrical system warning" is active and DTC U046900 is recorded. The bulletin provides information for diagnosing and addressing this specific condition. A qualified technician will use diagnostic tools to confirm the presence of DTC U046900 and evaluate the 48V electrical system. This helps in accurately diagnosing the Audi Q8 electrical system warning.

What Owners Should Do

If you experience the "48V vehicle electrical system warning" or suspect an issue with your Audi Q8 electrical system, it is recommended to contact your authorized Audi dealership. They have access to the latest technical service bulletins and diagnostic procedures, including the information provided in this manufacturer communication. Addressing the underlying cause of DTC U046900 is important for maintaining the proper function of your vehicle's electrical components.

Source: NHTSA Manufacturer Communication 10247506

Frequently Asked Questions

What does the "48V vehicle electrical system warning" mean in my Audi?
This warning message, often displayed in your instrument cluster, indicates a detected issue within your vehicle's 48-volt electrical system. This system powers various advanced features and components in your Audi.
What is DTC U046900 and how is it related to the 48V system?
DTC U046900 is a diagnostic trouble code that typically accompanies the "48V vehicle electrical system warning." It specifically points to an "Invalid Data Received from Battery Energy Control Module 'A'" or a similar communication fault within the 48V electrical system, as outlined in manufacturer communication NHTSA ID 10247506.
Which Audi models are affected by the 48V electrical system warning described in this bulletin?
This manufacturer communication applies to various 2021-2023 Audi models, including the A6, A6 allroad, A7, A8 L e, Q7, Q8, and S8, which utilize the 48V electrical system.
What should I do if I see the "48V vehicle electrical system warning" in my Audi?
If you encounter the "48V vehicle electrical system warning" or have DTC U046900 stored, it is recommended to schedule an appointment with an authorized Audi dealership. They have the specialized tools and technical information to properly diagnose and resolve the issue.

Other revisions of this TSB

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