2024-2025 Audi Q5 e 12V Battery Discharge TSB 2074126/3

Symptoms

Owners of 2024-2025 Audi Q5 e PHEV vehicles may experience a 12V battery discharged condition. This can manifest as a battery fault detected during Pre-Delivery Inspection (PDI) using the ODIS new vehicle battery test plan.

Another common symptom is the 12V battery discharged after the vehicle has been stationary for some time. This indicates an unexpected drain on the battery.

Technical Background

Audi TSB 2074126/3 identifies a software issue within the High-voltage Battery Charger Control Module, which has the diagnostic address 00C6. This software fault causes unintended bus wake-ups, leading to the 12V battery discharged problem. The affected control module is the Gen3 Kostal unit.

Specific hardware part numbers associated with this issue include 9Y0915681 A, 9Y0915681 B, 9Y0915681 C, and 9Y0915681 D. The relevant software version is 3310.

Important Warnings

Audi advises that a permanent solution for the Audi Q5 e 12V battery discharged issue is currently under development and is expected by the end of the third quarter of 2025. Until then, owners should be informed that no repairs are necessary at this point.

Do not replace any components for this condition since this will not resolve the customer's concern. Replacing parts will not fix the underlying software issue. Additionally, if the workaround is applied, be aware that a terminal 30 reset causes the settings to be reset, and the procedure must be repeated.

Workaround

To prevent the Audi Q5 e 12V battery discharged issue from recurring, a temporary workaround is available. This involves adjusting the auxiliary air conditioning settings through the vehicle's infotainment system. This procedure needs to be repeated if a terminal 30 reset occurs.

Repair Procedure Summary

For 2024-2025 Audi Q5 e PHEV vehicles, follow these steps to implement the workaround:

1. Ensure the ignition is on. Select the "VEHICLE" tile on the infotainment screen.
2. From the VEHICLE menu, select the "Air conditioning" tile.
3. Within the Air conditioning menu, choose "Auxiliary air conditioning."
4. Locate and select a timer setting for the auxiliary air conditioning, then turn it on.
5. Immediately after turning the timer on, turn the timer off again. This action helps prevent unintended bus wake-ups.

For MY24 Audi Q8 e-tron vehicles experiencing a similar 12V battery discharge due to the high-voltage battery charging unit, please refer to TSB 2077527.

Warranty Information

For vehicles still under warranty, technicians should create a Pending Service Solutions (PSS) record in the AccessAudi system. This helps track the issue while a permanent solution is being developed. If the vehicle is outside of warranty, this Technical Service Bulletin (TSB 2074126/3) serves as informational guidance only.

The relevant Service Number for this condition is 9352, with Damage Code 0039. Labor operations include setting the high-voltage charging unit (operation 9352 1599, 10 TU) and Guided Functions (GFF) operations 0150 0060 and 0150 0010. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 11021451