2019-2025 Audi e-tron / Q8 e-tron Battery Charger Module Diagnostic Address Issue

Audi Technical Service Bulletin (TSB) 2063427/10, issued on November 15, 2024, addresses a specific problem encountered after replacing the high-voltage battery charger control module, identified as J1050. This TSB, which supersedes TSB Group 93 number 24-02 dated August 27, 2024, provides updated measures for resolving diagnostic address discrepancies.

This issue primarily affects 2019 Audi e-tron quattro; 2021-2023 Audi e-tron quattro; 2020-2023 Audi e-tron Sportback; and 2024-2025 Audi Q8 e-tron, Q8 Sportback e-tron, SQ8 e-tron, and SQ8 Sportback e-tron vehicles. When a new Audi e-tron battery charger module (J1050) is installed, it may fail to report correctly in the diagnostic scan tool, leading to the high-voltage system being unable to restart.

Revision History

This Technical Service Bulletin has undergone several revisions to refine the service measures and clarify information:

• Revision 10 (November 15, 2024): Updated service measures and revised the title for clarity.
• Revision 9 (August 27, 2024): Updated service measures related to the second On-Board Charger (OBC).
• Revision 8 (July 10, 2024): Revised service measures for non-UNECE software and updated labor operations for warranty claims.

Symptoms

Owners might notice that their vehicle's high-voltage system cannot be restarted after a battery charger control module replacement. Technicians will observe that the new high-voltage battery charger control module, J1050 (address word 00C6), no longer reports under its correct diagnostic address (00C6) in the diagnostic scan tool. Instead, it reports under address word 8113.

This incorrect reporting is often accompanied by event memories entered in address 0019, indicating that the "High-voltage system cannot be restarted."

Fault Codes / Diagnostic Addresses

While no traditional DTCs (e.g., P-codes) are explicitly listed, the TSB highlights specific diagnostic addresses and measured values crucial for diagnosis:

• J1050 (Address word 00C6): The correct diagnostic address for the high-voltage battery charger control module.
• Address word 8113: The incorrect diagnostic address under which the replaced J1050 module may report.
• Address 0019: The gateway where event memories related to the high-voltage system's inability to restart may be found.
• PRX voltage at charging socket A 5413 (decimal)/0x1525 (hexadecimal): A measured value to be read out from address 00C6/8113.
• PRX voltage at charging socket B 5417 (decimal)/0x1529 (hexadecimal): Another measured value to be read out from address 00C6/8113.

Technical Background

The core of this problem lies in the diagnostic address of the replacement high-voltage battery charger control module. The new part needs to have its diagnostic address or address word correctly changed to integrate properly with the vehicle's electrical system. If this change doesn't occur, the system misidentifies the module, leading to operational failures, including the inability to restart the high-voltage system.

Repair Procedure Summary

Audi outlines specific steps for technicians to correct the diagnostic address issue, depending on the vehicle's software version. The TSB 2063427/10 details these procedures.

For Software Versions 3112 or 3115 (=UNECE)

1. Order a New Charging Unit: A new high-voltage battery charging unit is required for the repair.
2. Check Charging Socket Resistance: Before installation, technicians must use a VAS 1594 tool to measure the resistance of the charging sockets. This involves checking pins 24-60 and 41-60 on the 60-pin T-60 connector. The measured values should be around 2.7k Ohm or 4.7k Ohm with a tolerance of +/- 5%.
3. Fuse Removal: Before installing the new charging unit, the fuse for either OBC1 (5) or OBC2 (11) must be removed from fuse carrier 1 (SR1).
4. Battery Charger Installation: Install the new battery charger, carefully observing the connection sequence. Electrical connectors -1- and -2- (as shown in Figure 1 of the TSB) should be connected first, followed by connector -4-.
5. Fuse Reinsertion: Reinsert the removed fuses for OBC1 or OBC2.
6. Module Activation: Activate the newly installed battery charger using the workshop manual's Guided Functions, specifically "Commissioning 00C6 - Replace control module."

If the On-Board Charger (OBC) still logs address 8113 instead of 00C6, further steps are required:

• End Guided Fault Finding (GFF). If event memory entries are static, restart GFF.
• Work through event memory entries from gateway 0019 according to the test plan.

If the high-voltage system still cannot be activated, update the electrical system configuration by navigating through the self-test button to: "0019 - Data bus on board diagnostic interface - J533" > "0019 - Technical product information" > "J533 - Technical Product information 2063053". If commissioning remains unsuccessful, a Technical Assistance Center (TAC) inquiry should be created.

For All Other Software Versions

If the concern occurs after component replacement, proceed using ODIS:

1. If the vehicle has PR number KB4 (onboard charging unit up to 22kW), disconnect charging unit 2 (AX5) first.
2. Select the self-test button and then navigate to: "High-Voltage Battery Charger Control Module 2, J1239 (Diagnostic address 8113)" > "8113 - High-Voltage Battery Charger Control Module 2, functions" > "8113 - Change diagnostic address from 8113 to 00C6."

If the high-voltage system cannot be activated again:

• End GFF. If the DTC is static, start GFF again.
• Work through DTC entries from the gateway (0019) according to the test plan.

If the high-voltage system still cannot be activated, update the electrical system configuration by pressing "Select self-test" and navigating to: "0019 - Data bus on board diagnostic interface - J533" > "0019 - Technical product information" > "J533 - Technical Product information 2063053".

Required Tools and Parts

Technicians will require specific tools to perform this repair:

• VAS 1594: Wire harness repair set
• VAS 6160/VAS 6150: VAS tester with the current version of ODIS (Windows 10)

Warranty Information

This Technical Service Bulletin is informational only if the vehicle is outside of its warranty period. For in-warranty repairs, the following details apply:

• Service Number: 9352
• Damage Code: 0039
• Claim Comment: As per TSB 2063427/10

Labor Operations:

• For Software version 3112 or 3115:
  • Replace high-voltage charging unit: 9352 5550 (Refer to SRT for associated operations)
  • GFF: 0150 0060 (Labor according to the diagnostic log)
• For all other software versions with charging unit 2 (AX5):
  • Loosen and secure high-voltage charging unit: 9352 0999 (50 Time Units)
  • GFF: 0150 0060 (Labor according to the diagnostic log)
• For all other software versions without charging unit 2 (AX5):
  • GFF: 0150 0010 (Refer to SRT for associated operations)
  • GFF: 0156 0060 (Labor according to the diagnostic log)

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

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Source: NHTSA ID 11011294