2022 Audi e-tron DTC P0B2600 P29FF00 Clearing Issue TSB

Audi has issued Service Information bulletin AOS-25-33 to address a specific diagnostic challenge affecting the 2022 Audi e-tron. This bulletin provides a hotfix for the Offboard Diagnostic Information System (ODIS Service) to resolve an issue where certain high-priority diagnostic trouble codes (DTCs) cannot be cleared.

Symptoms

The primary symptom for owners is the inability of a technician to clear specific diagnostic trouble codes (DTCs) related to the high-voltage battery, specifically P0B2600 and P29FF00. This occurs even after any underlying issues may have been addressed. The persistent presence of these codes indicates a limitation within the diagnostic software itself, rather than a continuous vehicle hardware fault.

Fault Codes / DTCs

The following diagnostic trouble codes are specifically addressed by this hotfix:

These codes are associated with the AX2 - High-Voltage Battery 1 DTC memory test function plan.

Diagnosis / Trigger Conditions

The issue stems from a conflict within the ODIS diagnostic system's routine for clearing DTCs. While the system has a routine for P29FF00, the presence of DTC P0B2600, which is assigned a higher priority, prevents P29FF00 from being cleared. This means the diagnostic tool itself requires an update to properly manage this priority conflict and allow for successful clearing of both codes. The problem specifically impacts the diagnostic process for the high-voltage battery system.

Repair Procedure Summary

This service bulletin outlines a temporary hotfix (AOS-25-33) for the ODIS Service diagnostic program. This hotfix enables technicians to correctly clear the persistent DTCs P0B2600 and P29FF00. The procedure involves a precise sequence of downloading, installing, and then immediately uninstalling the hotfix.

1. Download the Hotfix: The technician must open a web browser on the diagnostic device and log into AccessAudi.com. From there, they navigate to Elsa2Go > Service References > Software/Hardware Updates and search for the "AOS-25-33 Hotfix Zip File". This file is then downloaded and saved to the Windows desktop.
2. Install the Hotfix: After downloading, the hotfix zip file is opened, and its contents are copied and pasted onto the desktop. The ODIS Service program is then launched with administrator privileges. Within ODIS, the technician expands the "Data" submenu, selects "Hotfix", and clicks "Download". They confirm the workshop data patch import and select the hotfix file. A confirmation message will appear once the patch is successfully imported.
3. Perform Diagnostic Procedure: With the hotfix actively installed in ODIS Service, the technician can now proceed with the necessary diagnostic procedures on the 2022 Audi e-tron to clear the P0B2600 and P29FF00 DTCs.
4. Uninstall the Hotfix: It is critical that the hotfix is removed immediately after the diagnostic procedure is completed. To do this, the technician selects "Erase" under "Hotfix" in ODIS Service, confirms the deletion, and then closes the ODIS Service program. Failure to uninstall the hotfix can lead to malfunctions in subsequent diagnostic sessions.

Required Tools or Parts

To perform this procedure, the following are required:

• ODIS Service diagnostic system, running Audi brand version 2.38.3 software.
• Access to AccessAudi.com and Elsa2Go.
• Hotfix number: A_2.38.3_P29FF00_20250618-125452.

Owner Action

If your 2022 Audi e-tron is displaying persistent diagnostic trouble codes P0B2600 and P29FF00 related to the high-voltage battery, and these codes cannot be cleared by a service technician, you should inform your Audi service center about Technical Service Bulletin AOS-25-33. This TSB provides a specific hotfix for the ODIS diagnostic system that resolves this particular issue. Since this is a software-related diagnostic tool update, the procedure should be performed by an authorized Audi dealership and is typically covered under your vehicle's warranty.

Source: NHTSA ID 11020365