2021-2023 Audi e-tron HV Charger Module Fault TSB

Symptoms

Owners of affected 2021-2023 Audi e-tron vehicles may experience issues related to the high-voltage battery charger control module, identified as J1050. The primary symptom occurs after this module has been replaced due to a fault. The new unit may fail to report correctly in the diagnostic scan tool under its expected address, 00C6. Instead, it might report under an incorrect address, such as 8113.

Another critical symptom is that the "High-voltage system cannot be restarted." This indicates a failure in the vehicle's electrical system, potentially preventing the vehicle from operating. Event memories may also be entered in diagnostic address 0019, signaling an operational sequence incorrect for the charger for the electric drive motor high-voltage battery.

Fault Codes / Diagnostic Addresses

This TSB primarily addresses issues related to diagnostic addresses rather than traditional DTCs. The key identifiers are:

• 00C6: The expected diagnostic address for the high-voltage battery charger control module (J1050).
• 8113: An incorrect diagnostic address that the new J1050 module may report under after replacement.
• 0019: The diagnostic address for the gateway, where event memory entries related to the high-voltage system restart failure may be found.

Diagnosis / Trigger Conditions

The problem typically arises after the high-voltage battery charger control module (J1050) has been replaced. The new module, instead of being recognized at its correct diagnostic address 00C6, appears at address 8113. This misidentification prevents the high-voltage system from being properly restarted. Technicians will need to confirm this condition using a diagnostic scan tool.

Repair Procedure Summary

Audi Technical Service Bulletin 2063427/11 outlines a detailed process to resolve the issue with the Audi e-tron HV charger module. The repair involves several steps to ensure the correct installation and activation of the high-voltage battery charging unit:

1. Order New Unit: Obtain a new charging unit for the high-voltage battery.
2. Pre-Installation Check: Before installing the new unit, check the charging socket(s) and their resistance. Measurements on the 60-pin T-60 connector should show approximately 2.7k Ohm or 4.7k Ohm with a +/- 5% tolerance between pins 24-60 and 41-60.
3. Fuse Removal: Prior to installation, remove the fuse for either OBC1 (5) or OBC2 (11) from fuse carrier 1 (SR1).
4. Installation: Install the new battery charger, carefully following the connection sequence. First, connect electrical connectors -1- and -2-, then connect electrical connector -4- last.
5. Fuse Reinsertion: Reinsert the fuses for OBC1 or OBC2 that were previously removed.
6. Module Activation: After installation, activate the battery charger using the workshop manual's