2022 Audi e-tron DTC P0B2600 P29FF00 Clear Issue

Audi has identified a specific issue affecting the diagnostic process for 2022 Audi e-tron vehicles. This Service Information, identified as AOS-25-33, addresses a problem where certain diagnostic trouble codes (DTCs) related to the high-voltage battery cannot be cleared using the standard ODIS diagnostic routine. Specifically, the routine designed to clear DTC P29FF00 is ineffective because DTC P0B2600, which has a higher priority, prevents it from being cleared.

This hotfix is crucial for technicians performing diagnostics on the 2022 Audi e-tron P0B2600 P29FF00 issue, ensuring that the diagnostic system functions correctly and allows for proper fault clearing.

Symptoms

Owners or technicians may notice that despite attempting to clear diagnostic trouble codes, the fault codes P0B2600 and P29FF00 remain active in the vehicle's system. This prevents the successful completion of diagnostic procedures, particularly those involving the high-voltage battery.

Fault Codes / DTCs

This service information specifically targets two diagnostic trouble codes:

• P0B2600: This code has a higher priority, which interferes with the clearing process of other related DTCs.
• P29FF00: This code is the primary target for the clearing routine, but its removal is hindered by the presence of P0B2600.

Diagnosis / Trigger Conditions

The inability to clear the 2022 Audi e-tron P0B2600 P29FF00 codes is observed during the "AX2 - High-Voltage Battery 1 DTC memory test" function test plan within the ODIS diagnostic system. When this specific test is performed, the standard clearing routine for P29FF00 fails due to the persistent P0B2600 code.

Important Warnings

Audi has issued critical warnings regarding the use of this hotfix:

• "We recommend installation of this hotfix on one diagnostic device ONLY. Hotfix must be removed immediately after performing the procedure."
• "The Hotfix must be removed after performing the procedure. Failure to do so will cause other vehicle diagnostics sessions to malfunction."

These warnings underscore the temporary nature of the hotfix and the importance of adhering to the specified installation and removal protocol to prevent adverse effects on other diagnostic operations.

Repair Procedure Summary

To address the 2022 Audi e-tron P0B2600 P29FF00 clearing issue, technicians must follow a specific procedure involving the download, installation, use, and uninstallation of a hotfix for the ODIS Service diagnostic program. The hotfix number is A_2.38.3_P29FF00_20250618-125452, and it requires ODIS software version Audi brand version 2.38.3.

1. Download the Hotfix: Access AccessAudi.com via a web browser on the diagnostic device. Navigate to Elsa2Go > Service References > Software/Hardware Updates and search for the AOS-25-33 Hotfix Zip File. Download and save this file to the Windows desktop.
2. Prepare for Installation: After downloading, right-click the hotfix zip file and select 'Copy'. Then, right-click anywhere on the desktop and select 'Paste' to extract the hotfix file.
3. Install into ODIS Service: Open ODIS Service with administrator privileges. Expand the 'Data' submenu and click 'Download' under 'Hotfix'. Confirm the workshop data patch import by clicking 'Continue'. Browse to and select the hotfix file, then click 'OK' to complete the installation.
4. Perform Diagnostic Procedure: Once the hotfix is successfully installed, proceed with the necessary diagnostic procedure, which will now allow for the proper clearing of DTCs P0B2600 and P29FF00.
5. Uninstall the Hotfix: Immediately after completing the diagnostic procedure, the hotfix must be uninstalled. In ODIS Service, select 'Erase' under 'Hotfix' and click 'Continue' to confirm the deletion of the active workshop patch. Click 'OK' when prompted that the workshop data patch has been erased, then close ODIS Service.

Required Tools or Parts

• ODIS Service diagnostic software (Audi brand version 2.38.3 or higher)
• Hotfix file: A_2.38.3_P29FF00_20250618-125452
• Diagnostic device with internet access to AccessAudi.com

Owner Action

If you own a 2022 Audi e-tron and are experiencing issues with diagnostic trouble codes, particularly P0B2600 and P29FF00, or if you are informed that these codes cannot be cleared, it is recommended to contact your authorized Audi dealership. They are equipped with the necessary ODIS diagnostic tools and the specific hotfix (AOS-25-33) to resolve this issue efficiently.

Source: NHTSA ID 11020365