2023 Audi TCM Software Recall 37P3 for MIL Faults

Audi has initiated Emissions Recall 37P3 to address a software issue affecting the Transmission Control Module (TCM) in certain 2023 Audi vehicles. This recall specifically targets a software error within the TCM of affected DSG transmissions.

The core problem is that after repairs are completed to resolve an underlying transmission issue, certain fault codes that trigger the "malfunction indicator lamp (MIL)" cannot be cleared. While this 2023 Audi A6 TCM software error does not affect tailpipe emissions or vehicle drivability, the persistent MIL illumination can prevent vehicles from passing subsequent state inspection and maintenance testing.

Symptoms

The primary symptom of this issue is the "malfunction indicator lamp (MIL)" remaining illuminated on the dashboard. This occurs even after a repair has been performed to correct an underlying transmission problem. While the vehicle's performance and emissions are not directly impacted, the inability to clear these fault codes can lead to inspection failures.

Fault Codes / DTCs

The recall document indicates that "certain fault codes" cannot be cleared, leading to the MIL illumination. However, specific Diagnostic Trouble Codes (DTCs) are not listed in this communication. The underlying cause is a 2023 Audi A6 TCM software error.

Diagnosis and Trigger Conditions

The problem is traced to a software error within the Transmission Control Unit (TCM) of affected DSG transmissions. This error prevents the proper clearing of fault codes after a transmission-related repair. The condition is triggered when the TCM software incorrectly handles the clearing process for these specific fault codes.

Repair Procedure Summary

The corrective action for Emissions Recall 37P3 involves updating the Transmission Control Module (TCM) software. This software update is performed using specialized Audi diagnostic equipment.

Technicians must first verify the vehicle's eligibility using the VIN in the Elsa system's "Campaign/Action" screen, ensuring the campaign status is "open." If multiple software updates are pending, the oldest one must be performed first.

During the update process, several critical conditions must be met:

• The ODIS software on the diagnostic tester must be fully up to date.
• A battery charger, such as the VAS5908, must be connected to the vehicle battery and maintain a voltage above 12.5 volts throughout the update. Failure to do so can damage the control module.
• The diagnostic tester's screen saver and power-saving settings must be disabled.
• The VAS Diagnostic Tester (e.g., VAS6150X or VAS6160X) must be plugged in using its supplied power adapters, not relying on battery power alone.
• The flash process must be performed through "Audi Flashing," not "Guided Fault Finding (GFF)," to ensure efficiency and prevent issues.
• The VAS Diagnostics Interface must be connected to the tester via a USB cable; Bluetooth or Wi-Fi connections increase the risk of connection loss and are not permitted for this procedure.

After the update, the SVM process must be completed, and the diagnostic log sent to GFF Paperless. The SVM code 37P3A008 is used for this procedure.

Required Tools or Parts

To perform this software update, technicians will require specific equipment:

• Battery Tester/Charger: VAS5908 (or equivalent, with a current rating of at least 90A).
• Diagnostic Tester: VAS6150X or VAS6160X (or equivalent).
• Campaign Completion Label: Part number CAMP 010 000, which must be affixed next to the vehicle emission control information label after the work is complete.
• SAGA Code Stamps: Item numbers AUD4927ENG or AUD4927FRE are available for ordering for stamping repair orders.

Important Warnings for Owners and Dealers

Owners and dealers should be aware of several critical advisories related to this recall:

• Inventory Vehicles: Dealers must ensure that every affected vehicle in their inventory has this campaign completed before delivery to consumers. Vehicles cannot be delivered until the update is completed.
• Modified Control Modules: If any control module(s) in your vehicle has been "chipped," "tuned," or otherwise modified from factory specifications with aftermarket components and/or software, work needed to repair, replace, or return the control module(s) to factory specifications is NOT covered under this action.
• Radiator Fan Safety: "Radiator Fan(s) may cycle ON high speed during the Update Process! There is a serious risk that personal injury may result if contact is made with spinning fan blades. Keep hands and all objects away from Radiator Fan(s) during Update Process!"
• Warranty Reimbursement: A warranty claim may not be reimbursed if the SVM process is not completed in its entirety and the database does not receive the update confirmation response.

Owner Action

Owner notification for this emissions recall (37P3) is scheduled to begin in May 2024. If you own a 2023 Audi A4, A5, A6, A7, Q5, or RS3, you should contact your authorized Audi dealer as soon as possible to schedule the TCM software update. This work will be performed free of charge and is estimated to take about one hour.

For California Owners: The California Air Resources Board and the Department of Motor Vehicles (DMV) require that emissions-related campaigns like this 2023 Audi A6 TCM software error fix be completed prior to vehicle registration renewal. Upon completion of the work, your dealer will provide a signed "Vehicle Emission Recall - Proof of Correction" certificate (RC EMISCAVWAU). It is crucial to retain this certificate for your records and only mail it to the California DMV if requested.

You can check your vehicle's eligibility for this or any other recall/service campaign by visiting www.audiusa.com and entering your Vehicle Identification Number (VIN).

Bulletin Revision History

This emissions recall document, code 37P3, was originally published on April 26, 2024. It was subsequently updated on May 2, 2024, with revised criteria for claiming instructions.

NHTSA ID: 11002185