2021-2025 Audi Q5 e / A7 e Electrical System Fault TSB

Symptoms

Owners of 2021-2025 Audi Q5 e and A7 e vehicles may experience a prominent red electrical system warning displayed in the instrument cluster. This warning is often accompanied by the specific message, "Electrical system: fault. Safely stop vehicle". In severe cases, the vehicle may also be unable to start.

Fault Codes / DTCs

When diagnosing this Audi Q5 e electrical system fault, technicians will typically find the following diagnostic trouble code (DTC) logged in the 008C - Hybrid battery management control unit:

• P0AC000: Hybrid/EV Battery Pack Current Sensor "A" Circuit Range/Performance (Symptom ID: 14340)

It is important to note that the following related DTCs are typically not logged when this specific issue occurs:

• P0AA700: Hybrid/EV Battery Voltage Isolation Sensor Circuit
• P0AA100: Hybrid Battery Positive Contact Circuit Stuck Closed
• P0AA200: Hybrid/EV Battery Positive Contactor Circuit Stuck Open
• P0AA400: Hybrid/EV Battery Negative Contact Circuit Stuck Closed
• P0AA500: Hybrid/EV Battery Negative Contact Circuit Stuck Open

Diagnosis

To properly diagnose the Audi Q5 e electrical system fault, technicians should first confirm the software version of the High-Voltage Battery Switch Box (diagnostic address 06D0). The relevant software versions for this issue are 0108 or 0208. This can be checked using the Guided Functions in ODIS by navigating to Diagnostic address 008C, then Guided Function, Read identification, and finally Read additional identification data. The results will be displayed in the diagnostic log.

Important Warnings

Audi Technical Service Bulletin 2076748/2 highlights critical information for both technicians and owners:

• Do not replace parts: "Replacing parts or attempting repairs will not fix the problem." This means that replacing components like the Hybrid/EV Battery Pack Current Sensor 'A' without following the TSB's procedure will not resolve the issue and could lead to unnecessary costs.
• Warranty implications: "Unjustified work/replacement parts will be charged back. Invoicing under warranty is not permitted." For vehicles outside of warranty, this TSB is for informational purposes only, and any repairs would be at the owner's expense if not covered by a separate policy.

Repair Procedure Summary

If your vehicle is experiencing this Audi Q5 e electrical system fault, the recommended procedure outlined in TSB 2076748/2 involves a specific sequence of steps:

1. Activate bus sleep mode: This requires locking the vehicle, ensuring no electrical equipment is active (contactors must be open), and confirming the vehicle is not connected to a charger.
2. Erase event memory entries: After the bus sleep cycle is complete, all stored event memory entries should be cleared.
3. Re-assess: The vehicle should then be re-assessed to determine if the issue still occurs.

If the complaint persists after these steps, technicians are instructed to submit a TAC (Technical Assistance Center) ticket or TAC Web ticket. The TSB number (2076748/2) should be included in the field for additional information on workshop findings to help the internal department identify the connection to this TSB quickly. TAC will then provide further information.

Superseded Bulletin

This Technical Service Bulletin 2076748/2 supersedes Pending Service Solution (PSS) TSB 2074901, which also addressed the red electrical system fault in the instrument cluster with DTC P0AC000 for Q5/A7 PHEV models.

Warranty Information

All warranty claims submitted for payment must adhere to the Audi Warranty Policies and Procedures Manual. Claims are subject to review or audit by Audi Warranty. The TSB explicitly states that if the vehicle is outside of any warranty, the information provided in this bulletin is for informational purposes only.

NHTSA ID: 11017680