2021-2023 Audi Parking Aid DTC B107A16 Issue

Audi has released Technical Service Bulletin (TSB) 2069678/1 to address a specific issue affecting the parking aid system in various 2021-2023 Audi models. This bulletin provides guidance for technicians when customers report that their parking aid is not functioning correctly and a specific diagnostic trouble code (DTC) is stored.

This TSB clarifies that the problem, often indicated by the Audi parking aid DTC B107A16, is typically not a hardware failure but rather a software misinterpretation. Understanding this can help owners avoid unnecessary repairs and ensure their vehicle receives the appropriate resolution.

Symptoms

Owners of affected Audi vehicles may notice that the "acoustic and optical parking aid does not work." This means the audible alerts and visual displays that assist with parking may be inactive or unresponsive, making parking maneuvers more challenging.

Fault Codes / DTCs

When the parking aid system malfunctions, a specific diagnostic trouble code (DTC) may be stored in the vehicle's driver assist systems control unit, identified as J1121 (address word 00A5). The relevant DTC is:

Code	Description	Module	Symptom Number
B107A16	Voltage supply for parking aid sensor, voltage too low	J1121	233474

This Audi parking aid DTC B107A16 indicates that the control unit is detecting a voltage supply issue to the parking aid sensors, even if the voltage is actually within normal operating parameters.

Technical Background

According to Audi, the underlying cause for the Audi parking aid DTC B107A16 is often a software-related misdiagnosis. This means the control unit erroneously interprets a normal condition as a low voltage supply, triggering the DTC and disabling the parking aid functionality. There is no actual electrical fault with the sensor voltage supply in these cases.

Important Warnings for Owners

Audi has provided specific instructions for technicians regarding this condition, which are crucial for owners to understand:

• "No repair is available at this time." This indicates that a physical repair or component replacement is generally not the solution for this specific DTC.
• "Do not perform any repairs. Any repairs for this concern may be denied." This warns against attempting to replace parts like parking aid sensors or the J1121 control unit, as these actions will likely not resolve the issue and may not be covered under warranty.
• "Instruct the customer that this condition is normal." This emphasizes that the presence of this DTC and the temporary non-functionality of the parking aid, under these specific circumstances, is considered an expected behavior due to the software misdiagnosis.
• "This TSB is informational only and not applicable to any Audi warranty." This means the TSB itself does not guarantee warranty coverage for diagnosis or resolution, although in practice, software updates or DTC clearing are often performed by dealers.

Repair Procedure Summary

For the Audi parking aid DTC B107A16, the resolution depends on the software version of the J1121 driver assist control unit:

1. If the J1121 control unit's software is older than SW 0381: Technicians are instructed to perform a software update. This update is detailed in a separate Technical Service Bulletin, TSB 2069244.
2. If the J1121 control unit's software is already SW 0381 or newer: The symptoms associated with the Audi parking aid DTC B107A16 should resolve themselves after an ignition cycle. In this scenario, the primary action is to erase the stored diagnostic trouble codes from the vehicle's memory.

No parts replacement is typically required for this issue, as it stems from a software interpretation rather than a hardware failure.

Owner Action

If your 2021-2023 Audi experiences the "acoustic and optical parking aid does not work" symptom and you suspect the Audi parking aid DTC B107A16, it is recommended to visit an authorized Audi service center. Inform them about the issue and mention TSB 2069678/1. The technicians will diagnose the vehicle, check the software version of the J1121 control unit, and perform the appropriate action, which will likely be a software update or simply clearing the DTCs.

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Source: NHTSA ID 10233623