Airbag control unit with part number 80A959655G

What is the function of the airbag control unit 80A959655G?

The airbag control unit with part number 80A959655G is the central control module for the occupant protection system in modern Audi Q5 models. It processes signals from crash sensors to precisely deploy airbags and seatbelt pretensioners in the event of a collision. As an OEM component supplied by Audi/Bosch, it is responsible for storing relevant vehicle data, including crash data.

This control unit, manufactured by Bosch for Audi, continuously monitors the network of acceleration and pressure sensors distributed throughout the vehicle. It serves as the “brain” of the passive safety system, ensuring that all components remain operational at all times.

Its primary task is to determine within milliseconds whether a crash necessitates the deployment of safety devices. These include front, side, and head airbags, as well as pyrotechnic seatbelt pretensioners that securely hold occupants in their seats during a collision.

Why does the control unit 80A959655G fail?

The most common cause of failure for the control unit 80A959655G is the storage of crash data after an accident or airbag deployment. Other causes include internal hardware defects, such as issues with microcontrollers or capacitors, which can lead to communication malfunctions or the persistent illumination of the airbag warning light (error code B2000).

Following an accident involving airbag deployment, the control unit deliberately locks itself by writing non-erasable crash data into its memory. This is a manufacturer‑imposed safety measure designed to require professional inspection and repair of the entire system. A standard OBD2 diagnostic tool cannot erase this data.

Besides crash data, purely electronic faults may also occur. These involve defective components on the circuit board, such as capacitors or the microcontroller itself. Such internal defects often manifest similarly to stored crash data and frequently result in complete loss of communication with the device.

It’s important to note that part numbers 80A959655N and 80A959655R, as well as the Bosch part number A2C96376516, are often interchangeable or compatible with 80A959655G. The described defects apply equally to these variants.

How do you recognize a defect in the 80A959655G?

A defect in the airbag control unit 80A959655G primarily manifests as the airbag warning light remaining constantly illuminated in the instrument cluster. Often, the control unit can no longer be accessed via the OBD2 interface, complicating diagnostics at the workshop. The error memory frequently contains code B2000.

The most obvious symptom is the active airbag warning light. It fails to extinguish after engine start-up, signaling a critical fault in the restraint system, rendering it non‑functional under these conditions.

Another clear indication is a communication breakdown. When the workshop attempts to read the error memory using a diagnostic tool, the control unit no longer responds, effectively going “offline” for standard diagnostic queries.

The specific error code B2000 (“control unit defective” or similar wording) is a very common entry in the error memory of the central gateway or other control units, directly indicating an internal, irreparable fault within the airbag module from the vehicle’s perspective.

In which vehicles is the control unit 80A959655G installed?

The airbag control unit 80A959655G is specifically installed in Audi Q5 models. This includes the second generation (type FY) from model year 2017 onward, as well as the corresponding Sportback variants (type FYB). At Airbag24, we professionally repair this control unit for the aforementioned models.

At Airbag24, we repair part number 80A959655G and its variants for the following Audi models:

Audi Q5 (type FY), model years 2017–2020

Audi Q5 Facelift (type FY), model years 2020–2024

Audi Q5 Sportback (type FYB), model years 2020–2024

This also covers the sporty SQ5 variants within these model years and types. It’s important not to confuse this control unit with those used in the older Q5 generation (type 8R, 2008–2016), as they employ different part numbers.

How is the control unit 80A959655G professionally repaired?

Professional repair of the 80A959655G at Airbag24 involves precise diagnostics, secure deletion of stored crash data, and replacement of defective electronic components. Following restoration, the control unit undergoes functional testing and calibration to ensure full compliance with OEM specifications. A 12-month warranty applies to the repair.

After submitting the control unit to Airbag24, a detailed incoming inspection takes place. Using specialized diagnostic equipment, technicians read the internal error memory to identify the exact cause—whether it’s stored crash data or a hardware defect on the circuit board.

The core of the repair lies in component-level intervention. This involves desoldering memory chips to professionally reset crash data, or replacing faulty components such as microcontrollers and capacitors. This process requires expertise and tools that go far beyond what a typical workshop can offer.

Following component-level repair, the control unit undergoes a comprehensive functional test. It is simulated in a test environment to ensure seamless communication and full restoration of all functions. The unit is returned ready for installation (“plug-and-play”) with a 12-month warranty on the work performed.

What shipping options are available at Airbag24?

For repairing your control unit at Airbag24, you can either ship the package yourself or arrange a UPS pickup at your preferred location. For return shipping, you have access to free standard and paid express UPS options, each also offering cash-on-delivery.

For sending the unit to us, you have two convenient choices. You can securely pack the removed control unit and send it to us, or bring it in person. Alternatively, you can request a UPS pickup from your chosen address.

For returning the repaired unit, we offer several options. UPS standard shipping is free of charge.

If you need faster delivery, you can opt for UPS express shipping.

Both standard and express shipping can optionally be arranged as cash-on-delivery, allowing you to pay the invoice directly to the courier upon receipt. Of course, you may also choose to pick up your repaired control unit in person at our facility.