2024 Alfa Romeo Tonale PIM Software Update TSB

This Technical Service Bulletin (TSB) 08-400-25, revised as 08-045-24 REV. C on December 12, 2025, addresses specific software issues affecting the Power Inverter Module (PIM) in certain 2024 Alfa Romeo Tonale vehicles. This update is crucial for resolving various electrical system concerns, including diagnostic trouble codes and warning messages related to the hybrid system. This bulletin supersedes the previous TSB 08-045-24 REV. C issued on December 11, 2024.

This TSB has also been released as Rapid Service Update (RSU) 24-153, which means applicable vehicle identification numbers (VINs) have been pre-identified for this service action. Owners of affected vehicles experiencing symptoms should contact their authorized dealer for the necessary software update.

Symptoms

Owners of the 2024 Alfa Romeo Tonale may observe a Malfunction Indicator Lamp (MIL) illumination on the dashboard. Additionally, the vehicle might display the message "Cabin Preconditioning Unavailable" if the scheduled cabin preconditioning does not perform as expected. These symptoms are often accompanied by specific diagnostic trouble codes.

Fault Codes / DTCs

Customers may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system:

Code	Description	Module
P2601-00	Electric Coolant Pump Control Circuit Performance Stuck Off	Hybrid Control Processor (HCP)
U0623-00	Lost Communication With Coolant Pump "A"	Hybrid Control Processor (HCP)
P1DBA	Battery Cooling System Failure	Module, Hybrid Control Processor (HCP)

Diagnosis

To diagnose the issue, technicians will use a Scan Tool (wiTECH) to verify related systems are functioning correctly. If any of the listed DTCs or symptom conditions are present, the repair procedure outlined in this bulletin should be followed. For vehicles identified on the RSU VIN list, the repair is applicable directly. If a vehicle not on the RSU list exhibits the symptoms, the repair procedure should still be performed.

Repair Procedure Summary

The primary solution for this issue involves reprogramming the Auxiliary Hybrid Control Processor (AHCP) and Hybrid Control Processor (HCP), collectively known as the Power Inverter Module (PIM), with the latest available software. This software update addresses the underlying cause of the Malfunction Indicator Lamp (MIL) illumination and the "Cabin Preconditioning Unavailable" message, as well as the associated DTCs like P2601-00, U0623-00, and P1DBA. The process requires ensuring the vehicle's battery is adequately charged using a battery charger to prevent interruption during the flash. After reprogramming, any set DTCs in other modules due to the update will be cleared using the wiTECH application.

Important Warnings

Technicians must adhere to strict safety protocols when performing this software update, especially concerning high-voltage components:

• Before software reprogramming, the vehicle must be made safe, which includes disconnecting the high-voltage system's power supply if repairs involve or imply contact with live high-voltage components.
• Only specifically trained and qualified technicians are authorized to work on high-voltage systems.
• All general instructions for working safely on hybrid/electric vehicles, including the use of suitable general equipment and Personal Protective Equipment (PPE), must be followed.
• The vehicle must not be connected to a high-voltage charger while performing software updates.
• Install a battery charger to ensure sufficient battery voltage during the flash process.
• If the flash process is interrupted or aborted, it must be restarted.
• No parts are required to be replaced for vehicles exhibiting DTCs P2601 and U0623 before or after the software update.

Required Tools

• wiTECH or Equivalent: A compatible scan tool is necessary for diagnosis and performing the software reprogramming.

Owner Action

If your 2024 Alfa Romeo Tonale is experiencing a Malfunction Indicator Lamp (MIL) illumination, displaying a "Cabin Preconditioning Unavailable" message, or you suspect any of the listed DTCs (P2601-00, U0623-00, P1DBA), you should schedule an appointment with an authorized Alfa Romeo dealer. This software update for the Alfa Romeo Tonale PIM update is reimbursable under warranty provisions. The dealer can verify if your vehicle is part of the RSU 24-153 campaign or if it requires this specific TSB 08-400-25 service action.

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Source: NHTSA ID: 11026679