2025 Audi A5/S5 AC System Malfunction TSB 2080019/1

Symptoms of AC Malfunction

Owners of certain 2025 Audi A5 and S5 models may experience a frustrating issue with their vehicle's air conditioning system. The primary symptom of this 2025 Audi A5 AC system malfunction is that the air conditioning system fails to operate as expected. When the driver attempts to activate the AC, the AC button on the control panel automatically deactivates itself almost immediately after being pressed. This prevents the vehicle from cooling the cabin effectively, leading to discomfort, especially in warmer conditions.

Identifying the Fault Code B16A1F0

When diagnosing this specific air conditioning problem, technicians will typically find a particular event memory entry logged in the vehicle's diagnostic system. The relevant diagnostic address is 00C5, which is associated with the thermal management system. Within this system, the fault code recorded is "B16A1F0 - Refrigerant Shut-Off Valve, icing - water load too high". This specific fault code points directly to the root cause of the AC system's malfunction and the automatic deactivation of the AC button.

Diagnosis and Confirmation

To confirm the presence of this 2025 Audi A5 AC system malfunction, a technician will first attempt to reproduce the customer's complaint. This involves trying to engage the air conditioning system and observing the immediate deactivation of the AC button. Following this, a diagnostic scan of the vehicle's control units is performed. The key step is to check for the event memory entry "B16A1F0 - Refrigerant Shut-Off Valve, icing - water load too high" within diagnostic address 00C5. The presence of this specific fault code confirms that the vehicle is experiencing the software-related issue detailed in Technical Service Bulletin 2080019/1.

The Software Update Solution (TSB 2080019/1)

Technical Service Bulletin (TSB) 2080019/1 outlines the necessary repair for the 2025 Audi A5 AC system malfunction. This TSB replaces a previous Pending Service Solution (PSS) TSB, specifically PSS TSB 2079225, which also addressed the AC system not working and the AC button deactivating. The core of the repair involves a software update to correct the underlying issue within the thermal management system (diagnostic address 00C5).

Before initiating the repair described in TSB 2080019/1, technicians are instructed to verify if another relevant bulletin, TSB 2079690, titled "00 Combined software update 03.10.00/C (28.13.01) KD2", is applicable to the vehicle. If TSB 2079690 is visible and applicable, its prescribed software update must be performed. This ensures that all necessary software corrections are applied to resolve the AC system's erratic behavior.

Required Tools and Procedures

The repair procedure for this 2025 Audi A5 AC system malfunction primarily involves a software update. During this process, it is crucial to connect a battery charger to the vehicle. This ensures a stable power supply throughout the software flashing procedure, preventing potential interruptions or data corruption that could occur due to voltage fluctuations. The labor operations, identified by codes 0151 0010 and 0151 0040, cover the software update itself, along with all associated preliminary and follow-up work. This includes managing the bus sleep cycle, performing a calibration drive if required, and restarting the software update should any interruption occur during the flashing process. While no specific physical parts are replaced, the correct software version, identified as "00 Combined software update 03.10.00/C (28.13.01) KD2", is essential for a successful repair.

Warranty Information

For owners of 2025 Audi A5 and S5 vehicles, warranty coverage for this repair is subject to Audi's standard Warranty Policies and Procedures Manual. The Service Number for this issue is 8711, and the Damage Code is KD02. It is important to note a specific condition regarding warranty claims: if the vehicle is outside of its warranty period, Technical Service Bulletin 2080019/1 is provided for informational purposes only. This means that repairs performed on out-of-warranty vehicles may not be covered by Audi and could incur costs for the owner. All claims submitted for payment must adhere strictly to Audi's warranty guidelines and are subject to review or audit by Audi Warranty personnel.

Source: NHTSA Manufacturer Communication 11026274