2021-2025 Audi Q5 e Electrical System Malfunction TSB 2081028/2

Audi has released Technical Service Bulletin (TSB) 2081028/2, titled "93 Reporting Obligation Pre-Repair PHEV 'Electrical system malfunction' warning light is on," to address a specific issue affecting 2021-2025 Audi Q5 e quattro vehicles. This bulletin, released on February 23, 2026 (Revision 2), is primarily informational. It serves as a request for technicians to gather specific diagnostic data when the Audi Q5 e electrical malfunction condition occurs. The aim is to assist Audi in understanding and ultimately resolving the underlying cause of this issue, as previous warranty repairs have not consistently identified the root cause.

Symptoms Owners May Experience

Owners of affected Audi Q5 e models may observe a prominent "electrical system malfunction" warning light illuminated on their instrument cluster. This is often accompanied by a critical operational symptom: "The vehicle will not go into drive." This combination of warnings indicates a significant problem within the vehicle's electrical or hybrid system, preventing normal operation.

Diagnostic Trouble Codes (DTCs)

When an "electrical system malfunction" warning light appears, technicians are instructed to check for specific Diagnostic Trouble Codes (DTCs) that must be stored in the Hybrid Battery Management module, J840 (address word 008C). The presence of these codes is crucial for reporting the issue to Audi's Technical Assistance Center (TAC). The identified DTCs include:

• P0AF800: Hybrid/EV Battery System Voltage
• U01A000: Lost Communication with Hybrid/EV Battery Interface Control Module "A"
• U01A100: Lost Communication with Hybrid/EV Battery Interface Control Module "B"
• U01A200: Lost Communication with Hybrid/EV Battery Interface Control Module "C"
• U01A300: Lost Communication with Hybrid/EV Battery Interface Control Module "D"
• U01A400: Lost Communication with Hybrid/EV Battery Interface Control Module "E"
• U01A500: Lost Communication with Hybrid/EV Battery Interface Control Module "F"
• U01A600: Lost Communication with Hybrid/EV Battery Interface Control Module "G"
• U01A700: Lost Communication with Hybrid/EV Battery Interface Control Module "H"

These U-codes, indicating lost communication with various Hybrid/EV Battery Interface Control Modules, along with the P0AF800 code related to battery system voltage, point towards potential issues within the high-voltage battery system or its communication network.

Important Warnings for Owners and Technicians

This TSB contains critical instructions for technicians and implications for owners regarding the Audi Q5 e electrical malfunction:

• Do Not Replace Parts Prematurely: Technicians are explicitly instructed to contact the Audi Technical Assistance Center (TAC) before replacing any parts. This is to ensure proper diagnosis and to avoid unnecessary part replacements, as previous attempts to fix the condition by replacing parts did not resolve the underlying issue.
• Informational Only, Not a Repair: TSB 2081028/2 is an informational bulletin. It does not provide a repair procedure but rather outlines a data collection process.
• Not Applicable to Audi Warranty: This TSB is informational only and is not applicable to any Audi Warranty. This means it's not a standard warranty claim procedure for a specific repair.
• No Production Changes: Audi states that no changes to production have been made, as no issue has been identified at the production level.

Technical Background and Purpose of the TSB

Audi's technical background for TSB 2081028/2 indicates that various parts have been replaced under warranty for the "electrical system malfunction" condition, but these replacements did not consistently resolve the issue. To gain more comprehensive information on the specific DTC codes and conditions for the affected vehicles, Audi of America is actively requesting technical information from service centers. This collaborative approach aims to identify the true root cause and develop an effective solution.

Service Procedure Summary

For vehicles experiencing the "electrical system malfunction" warning light and the inability to go into drive, the service procedure outlined in TSB 2081028/2 focuses on data collection rather than immediate repair. Technicians are required to:

1. Verify the condition: Confirm the presence of the "electrical system malfunction" warning light and the vehicle's inability to go into drive.
2. Check for DTCs: Scan for and identify the specific DTCs (P0AF800, U01A000 through U01A700) stored in the Hybrid Battery Management module, J840.
3. Contact TAC: If the vehicle is within the New Vehicle Limited Warranty, technicians must contact an Audi Technical Assistance Center (TAC) consultant before proceeding with any repairs.
4. Attach Diagnostic Logs: It is mandatory to attach the DTC information and a diagnostic log to the TAC Web Ticket. This data is crucial for Audi's ongoing investigation into the Audi Q5 e electrical malfunction.

Revision History

TSB 2081028/2 is a revision of an earlier bulletin. The initial publication (Revision 1) was dated February 17, 2025. Revision 2, released on February 23, 2026, primarily involved a revised header to add more model years to the scope of the bulletin.

What Owners Should Do

If your 2021-2025 Audi Q5 e quattro displays an "electrical system malfunction" warning light and will not go into drive, it is important to contact your authorized Audi dealership immediately. Inform them of the symptoms and mention TSB 2081028/2. The dealership will then follow Audi's procedure to collect the necessary diagnostic data and consult with the Technical Assistance Center.

NHTSA ID: 10248408