2025 Alfa Romeo Tonale Cabin Preconditioning TSB 08-044-26

Owners of the 2025 Alfa Romeo Tonale may experience issues with their vehicle's scheduled cabin preconditioning system. Technical Service Bulletin (TSB) 08-044-26, revision 08-401-25, has been issued to address this concern. This bulletin specifically applies to 2025 Alfa Romeo Tonale vehicles built on or before October 20, 2025, equipped with the 1.3L I4 DOHC Turbo PHEV Engine (Sales Code EYG) and is applicable to the North American market. This TSB supersedes a previous bulletin, TSB 08-402-25, dated December 12, 2025.

Symptoms

Customers may observe that their 2025 Alfa Romeo Tonale is not performing scheduled cabin preconditioning as expected. This condition is often accompanied by the message "Cabin Preconditioning Unavailable" displayed in the Instrument Panel Cluster (IPC).

Cause

The root cause of the 2025 Alfa Romeo Tonale cabin preconditioning issue is identified as outdated software within the Auxiliary Hybrid Control Processor (AHCP) and Hybrid Control Processor (HCP) modules. Updating these modules with the latest available software is necessary to resolve the problem.

Important Warnings

Several critical warnings and precautions must be observed during the repair procedure to ensure safety and prevent damage:

• Vehicle Safety: Before any software reprogramming, the vehicle must be made safe. This includes disconnecting the power supply to high-voltage components and systems if repairs involve potential contact with them.
• Qualified Technicians: Only specifically trained technicians, qualified to work on vehicles with high-voltage systems and authorized by current national laws/regulations, are permitted to perform these repairs.
• High-Voltage Safety: All diagnostic and repair work on hybrid/electric vehicles requires careful adherence to general safety instructions, including the use of suitable general equipment and Personal Protective Equipment (PPE).
• Charging Prohibition: The vehicle must not be connected to a high-voltage charger while performing software updates.
• Battery Voltage: A 12V battery charger must be installed to ensure sufficient battery voltage throughout the flash process.
• Interruption of Flash: If the flash process is interrupted or aborted for any reason, it must be restarted.
• Fuse Removal: Removal of fuse F81, a green 30 Amp fuse for the Brake Booster Vacuum Pump located in cavity F81 of the Power Distribution Center (PDC) in the engine compartment, is mandatory. Failure to remove this fuse could damage the Brake Booster Vacuum Pump.
• Flashing Order: The AHCP must be flashed first. It will temporarily go offline and come back online after the HCP flash is complete. Do not proceed with the HCP flash if the AHCP flash fails or is interrupted; contact STAR support if this occurs.

Repair Procedure Summary

The repair for the 2025 Alfa Romeo Tonale cabin preconditioning problem involves updating the software for the Auxiliary Hybrid Control Processor (AHCP) and Hybrid Control Processor (HCP). The procedure, which takes approximately 0.5 hours of labor, is as follows:

1. Technicians must first remove the green 30 Amp fuse from cavity F81, which controls the Brake Booster Vacuum Pump, located in the Power Distribution Center (PDC) in the engine compartment.
2. The AHCP is then reprogrammed with the latest available software using the wiTECH diagnostic application. If any issues arise during this step, a help desk ticket should be submitted.
3. Following a successful AHCP flash, the HCP is then reprogrammed with its latest available software, also using the wiTECH diagnostic application. Again, help desk support should be contacted for any issues.
4. After both modules are successfully reprogrammed, fuse F81 must be reinstalled.
5. Finally, any Diagnostic Trouble Codes (DTCs) that may have been set in various modules during the reprogramming process must be cleared using the wiTECH application.

Required Tools or Parts

To perform this service, technicians will require a wiTECH diagnostic tool or an equivalent system. Additionally, a 12V battery charger is necessary to maintain proper voltage during the software flashing process.

Owner Action

If your 2025 Alfa Romeo Tonale is experiencing issues with scheduled cabin preconditioning or displaying the "Cabin Preconditioning Unavailable" message, it is recommended to schedule an appointment with an authorized Alfa Romeo dealership. The repair, identified by labor operation number 18-19-86-BM, is reimbursable under the provisions of the vehicle's warranty.

NHTSA ID: 11028760