2022 Alfa Romeo Stelvio ACC Does Not Operate TSB

Owners of the 2022 Alfa Romeo Stelvio may encounter specific warning messages related to their vehicle's Adaptive Cruise Control (ACC) and Start/Stop system. This manufacturer communication, identified as TSB 10221417, addresses these concerns, which can significantly impact driving convenience and vehicle functionality. The core issue often points to an invalid signal from the Engine Torque DASM.

Symptoms

If your 2022 Alfa Romeo Stelvio is affected by this issue, you may observe the following warning messages displayed in your vehicle's instrument cluster:

• "ACC Does Not Operate"
• "Start Stop Unavailable"
• "ACC Unavailable Service Required Messages"

These messages indicate that the respective systems are not functioning correctly, potentially affecting your driving experience and the vehicle's efficiency.

Fault Codes / DTCs

The primary diagnostic trouble code (DTC) associated with the Alfa Romeo Stelvio ACC does not operate and related issues is:

• C1452-86: Engine Torque DASM- Signal Invalid

This code points to a problem with the signal integrity from the Engine Torque DASM (Driver Assistance System Module), which is crucial for the operation of systems like ACC and Start/Stop.

Diagnosis / Trigger Conditions

The presence of DTC C1452-86, specifically indicating an "Engine Torque DASM- Signal Invalid" condition, is the key diagnostic indicator for this issue. This signal invalidity can prevent the Adaptive Cruise Control and Start/Stop systems from engaging or operating correctly, leading to the warning messages. A proper diagnosis by a qualified technician is required to pinpoint the exact cause of the invalid signal.

Repair Procedure Summary

While specific repair steps are not detailed in the summary of manufacturer communication 10221417, addressing the Alfa Romeo Stelvio ACC does not operate issue will involve diagnosing and correcting the "Engine Torque DASM- Signal Invalid" condition. This typically requires specialized diagnostic tools and expertise to identify whether the problem lies with the DASM module itself, its wiring, or related sensors. The repair will focus on restoring the valid signal from the Engine Torque DASM to ensure proper functionality of the ACC and Start/Stop systems.

Owner Action

If your 2022 Alfa Romeo Stelvio is displaying "ACC Does Not Operate", "Start Stop Unavailable", or "ACC Unavailable Service Required Messages", it is recommended to schedule an appointment with an authorized Alfa Romeo dealership. They have the necessary diagnostic equipment and technical information, including TSB 10221417, to accurately diagnose the C1452-86 fault code and perform the appropriate repairs. Do not attempt to self-diagnose or repair complex driver assistance systems, as this could lead to further issues or safety concerns.

NHTSA ID: 10221417