2025 Audi A5 / A6 e-tron Exterior Door Handle Ejection TSB

Owners of 2025 Audi A5 and A6 e-tron models may encounter an unexpected issue where the exterior door handle's manual release mechanism ejects without any apparent cause. This condition, often described as the "Audi A5 A6 e-tron exterior door handle ejection," is addressed by Audi Technical Service Bulletin (TSB) 2079351/1, released on September 29, 2025. This bulletin provides workshop information regarding the potential triggers and diagnostic steps for this specific concern.

Symptoms

The primary symptom reported by vehicle owners is the manual release mechanism for the exterior door handles ejecting unexpectedly. This can occur without any prior warning or incident, such as an accident. The TSB notes that the mechanism is ejected for no reason, as depicted in the Owner's Manual for manual release procedures. This can impact the overall functionality of the doors and their operation, as well as the vehicle's access control, start authorization, and anti-theft protection systems, specifically concerning the locking and unlocking of the vehicle. The issue is categorized internally by Audi as a functionality concern related to body attachments and installations, particularly the doors and their lids operation.

Figure 1 in the TSB visually illustrates the manual release mechanism for the door handles, showing the component in an ejected state, indicating the physical manifestation of the problem.

Fault Codes / DTCs

When the "Audi A5 A6 e-tron exterior door handle ejection" occurs, technicians may find specific diagnostic trouble codes (DTCs) logged in the vehicle's control units. These codes help pinpoint the electronic systems involved in the malfunction.

Diagnostic Address	Diagnostic Trouble Code	Fault Symptom	Storage State
00BB	B1908F0	Crash response active	Intermittent
0052	B1908F0	Crash response active	Intermittent
0052	B1908F0	Crash response active	static
0042	B1908F0	Crash response active	Intermittent
00BC	B1908F0	Crash response active	static
00BB	B1908F0	Crash response active	static
0042	B1908F0	Crash response active	static
00BC	B1908F0	Crash response active	Intermittent
0046	U112100	Data bus missing message - symptom: 86111

The B1908F0 code, indicating "Crash response active," is typically logged in the door control units with diagnostic addresses 0042 (Driver's door electronics), 0052 (Passenger's door electronics), 00BB (Rear driver's side door electronics), and 00BC (Rear passenger side door electronics). This code can be stored as either "Intermittent," meaning the fault occurred temporarily, or "static," indicating a persistent issue. The U112100 code, signifying a "Data bus missing message" with symptom 86111, may be found in the convenience system central module (diagnostic address 0046). This suggests a communication breakdown within the vehicle's network.

Technical Background and Diagnostic Conditions

Audi TSB 2079351/1 outlines several technical reasons, beyond those described in the Owner's Manual (such as an accident or intentional manual release), that can cause the "Audi A5 A6 e-tron exterior door handle ejection." These conditions often relate to electrical or communication issues within the vehicle's complex electronic systems:

• Vehicle battery discharged/weak: A low or failing vehicle battery can lead to various electrical anomalies, potentially affecting control unit operation and triggering unexpected system responses, including the door handle mechanism. Insufficient voltage can cause control units to malfunction or report erroneous data.
• Driver's door unlocked via emergency power supply at front bumper: If the driver's door is unlocked using an emergency power supply, it might create a transient condition that the system misinterprets, leading to the ejection. This specific action can disrupt the normal electronic sequence for door access.
• Missing signals from airbag (fallback function relating to crash detection): The airbag system plays a crucial role in crash detection and related safety functions. If signals from the airbag system are missing or erroneous, the vehicle's safety systems might enter a fallback mode. This mode could inadvertently trigger mechanisms like the door handle ejection, which is typically designed for post-crash access to the vehicle.
• Sudden interruption of a diagnostic session while terminal 15 is switched on: "Terminal 15" refers to the ignition being switched on, supplying power to various vehicle systems. If a diagnostic session with the vehicle's systems is abruptly interrupted while the ignition is on, it can leave control units in an unstable state, potentially causing errors and unexpected activations.
• Unplugging of control units involved in signal transmission while terminal 15 is activated: Disconnecting critical control units while the ignition is on can severely disrupt the vehicle's internal communication network. Control units such as the J1312 (control unit for drive system and running gear functions, HCP1), J1273 (central control unit for data bus communication, HCP5), J519 (onboard supply control unit, HCP4), the door control unit, and the exterior door handle itself are vital for proper door handle operation. Their sudden disconnection can lead to system errors and trigger the manual release mechanism.
• Implausible signal chain of verified messages when programming the VKMS (vehicle key management system): The Vehicle Key Management System (VKMS) is responsible for recognizing and authorizing vehicle keys. Issues during the programming of the VKMS, particularly if there are inconsistencies or implausible signals in the communication chain, can affect how the vehicle recognizes and authorizes access, potentially leading to the door handle mechanism being triggered.

Workshop activities, especially those involving the vehicle's electrical system or control units, can also inadvertently cause the manual release mechanisms to eject. Technicians are advised to review event memory entries logged around the time of the complaint for wiring-related issues or airbag signal message failures, which can provide further clues to the root cause.

Repair Procedure Summary

For the "Audi A5 A6 e-tron exterior door handle ejection" issue, Audi TSB 2079351/1 outlines a diagnostic approach rather than a specific repair for the mechanism itself. The procedure depends on whether other underlying causes are identified:

1. Initial Assessment: Technicians should first check if any of the causes listed under the "Technical Background" section could have applied. This involves reviewing event memory entries logged in various diagnostic addresses at a date and time corresponding to the complaint. These entries may indicate wiring-related issues or airbag signal message failures.
2. Addressing Underlying Causes: If there are indications that the issue may have occurred due to other causes (e.g., additional event memory entries pointing to specific system failures), technicians should work through these using standard workshop materials and diagnostic procedures to address those underlying issues.
3. Re-inserting Pins (if no other cause): If, after thorough investigation, there are no other indications of underlying causes, or if the manual release mechanisms were triggered during a workshop visit, the procedure is straightforward: the pins for the manual release mechanism should be re-inserted. Owners can refer to their vehicle's Owner's Manual for instructions on how to perform this action. In this specific scenario, it is explicitly stated that it is not necessary to perform further checks on the manual release mechanisms.

Important Warranty Information

Owners should be aware of specific warranty limitations related to this issue, as detailed in Audi TSB 2079351/1. The bulletin explicitly states that:

• The reasons listed under the "Technical Background" section (such as a weak battery, emergency unlock scenarios, missing airbag signals, diagnostic session interruptions, unplugging active control units, or VKMS programming issues) are not a fault covered under warranty.
• Other causes, such as wiring failures or failures due to control units involved in transmitting signals, must be billed separately via the corresponding service number.
• It is not possible to bill for fault finding and/or component replacement under warranty via this TSB.

This means that if the issue stems from one of the technical conditions described in the TSB, the diagnosis and any necessary repairs or component replacements will likely not be covered under the standard vehicle warranty.

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Source: NHTSA ID: 10255152