2021 Audi e-tron Battery Module Control Unit Service Action

Audi has launched Service Action 93K4 to address a manufacturing issue affecting the Audi e-tron battery module in certain 2021 vehicles. This action ensures that affected vehicles receive the necessary repair to maintain proper battery monitoring.

Problem Description

On a small number of 2021 Audi e-tron vehicles, battery module control units were interchanged due to a process discrepancy during battery production. This means that some vehicles may have incorrect control units installed for monitoring the battery modules, potentially impacting the overall battery system's performance and safety.

Symptoms

This service action does not specify any direct owner-observable symptoms or dashboard warning lights. The issue is a manufacturing discrepancy identified by Audi. However, it pertains to the battery monitoring system, which is critical for the vehicle's high-voltage battery operation and overall vehicle function.

Repair Procedure Summary

The corrective action involves replacing the control unit for battery module monitoring. The repair process for the Audi e-tron battery module includes several detailed steps for technicians:

1. Vehicle Eligibility Check: Technicians must first verify the vehicle's eligibility using the VIN in the Elsa system. The "Campaigns/Actions" screen in Elsa is the only valid source for campaign inquiry and verification. The campaign status must show "open." If other open actions are present, the customer should be informed so all work can be completed during the same workshop visit.
2. Pre-Repair Checks: Any other open software update campaigns must be performed in order of their start date, with the oldest being completed first. It is a critical repair step that all safety recalls must also be completed prior to performing this campaign.
3. High-Voltage Safety Precautions: Before beginning any work, technicians must adhere to strict high-voltage safety protocols. The high-voltage system must be de-energized by a qualified high-voltage expert (HVE) to prevent severe bodily injury or death from electrocution or electric arcs. Special attention must be paid to the electric and magnetic fields, as they can be dangerous to individuals with active implants like pacemakers.
4. Battery Module Control Unit Replacement: The Battery Module Control Module(s) are replaced according to specific VIN criteria, which dictate which module(s) (e.g., Module 1, 3, 4, 5, 8, 9, or 12) need replacement. This procedure requires following the detailed instructions in the ELSA Repair Manual, specifically under "Motor > High-Voltage Battery > 93 Electric drive > High-Voltage Battery Components > Battery Module Control Module, Removing and Installing."
5. Inspection of Other Modules: While the high-voltage battery is disassembled, technicians are instructed to inspect the part numbers of other Battery Module Control Modules. If any module does not have the part number 4KE-915-215-B, it must also be replaced, ensuring all modules are correct.
6. Post-Repair Diagnostics and Software Update: After the physical replacement, a Guided Functions test plan titled "Replace battery modules control units" must be performed. If this test plan displays the message "Hardware requiring checking was detected... The following control units are invalid for this vehicle!", technicians must select "SVM code input" in Guided Fault Finding and perform a software update using SVM code 93K4A188. Finally, the diagnostic protocol must be sent online.

Labor Operations and Warranty Information

Audi has provided specific labor operations and time units for this service action:

• Service Number: 93K4
• Damage Code: 0099
• Parts Vendor Code: 002
• Claim Type: Sold vehicle: 7 10, Unsold vehicle: 7 90
• Causal Indicator: CONTR.UNIT

Labor Op	Time Units	Description
9328 19 99	1260	Replace control unit(s) for battery module monitoring
2706 89 50	10	Connect battery charger
0150 00 00	Time stated on diagnostic protocol	GFF Operations

Technicians are instructed not to claim wash/loaner services under this action. The labor times listed may differ from those in ELSA, and any damages resulting from improper repair are not eligible for reimbursement.

Required Tools or Parts

The primary component to be replaced is the control unit for battery module monitoring, part number 4KE-915-215-B. This part is ordered via a "VIN to Order" system. Other parts that may be required during the repair are managed through a "Free Order" system and include:

• 12E-915-754 (VALVE) - Quantity 8
• 4KE-121-809-B (SEAL) - Quantity 1
• 4KE-801-332 (SOUND ABS) - Quantity 4
• 4KE-801-557 (COVER) - Quantity 4
• 4KE-805-696 (SOUND ABS) - Quantity 2
• 4KE-915-433 (GASKET) - Quantity 1
• 4KE-915-434 (GASKET) - Quantity 2
• 80A-886-373 (GASKET) - Quantity 3
• D-450-P00-M2 (BUTYL TAPE) - Quantity 3
• G-12E-050-1G DSP (Coolant (1 gallon pre-mixed)) - Quantity ~2.2
• N-101-961-07 (Screw) - Quantity 18
• N-104-626-01 (BOLT) - Quantity 2
• N-106-847-01 (BOLT) - Quantity 50
• N-906-132-01 (SEAL RING) - Quantity 2
• N-911-407-01 (BOLT) - Quantity 2
• N-911-469-01 (SCREW) - Quantity 18
• N-911-900-02 (BOLT) - Quantity 2
• N-912-721-01 (SCREW) - Quantity 2
• WHT-008-659 and/or WHT-008-958 (BOLT) - Quantity up to 95
• WHT-008-738-A (BOLT) - Quantity 13

Note that part numbers may be updated in ETKA, and technicians should always use the latest information available there if a listed part becomes unavailable.

Important Warnings for Owners

• Free Repair Expiration: This service action is available free of charge only until May 25, 2026. If you wish to have this service performed after this date, your dealership's normal costs associated with the repair will apply.
• New Vehicle Delivery: Dealers are required to ensure that every affected inventory vehicle has this campaign completed before delivery to consumers. This prevents new owners from receiving a vehicle with the known manufacturing discrepancy.

Owner Action

If you own a 2021 Audi e-tron, you should schedule an appointment with your authorized Audi dealer as soon as possible to have this service action performed. The repair for the Audi e-tron battery module will be completed free of charge and is estimated to take about two days. You can check your vehicle's eligibility for this and any other open recall/service campaign by visiting www.audiusa.com and entering your Vehicle Identification Number (VIN). If you are the lessor of an affected vehicle, you are responsible for forwarding this notice to the lessee.

NHTSA ID: 10194493