2023 Alfa Romeo Stelvio P0606 PCM Software Update

Owners of the 2023 Alfa Romeo Stelvio may experience a Malfunction Indicator Lamp (MIL) illumination and the diagnostic trouble code (DTC) P0606 - Control Module Processor. This issue is specifically noted for vehicles equipped with the 2.9L V6 Twin Turbo PDI Engine (Sales Code EEC). This condition can also lead to the vehicle entering a "limp-in mode," which restricts engine performance to prevent further damage.

This bulletin, TSB 18-003-25 REV. A, addresses these concerns by providing a software update for the Powertrain Control Module (PCM). It supersedes a previous bulletin, TSB 18-003-25, issued on February 08, 2025, and has also been released as Rapid Service Update (RSU) 25-037.

Symptoms

If your 2023 Alfa Romeo Stelvio is affected by this issue, you may observe the following:

• Malfunction Indicator Lamp (MIL) illumination on the dashboard.
• The presence of Diagnostic Trouble Code (DTC) P0606 - Control Module Processor.
• The vehicle may enter a limp-in mode, limiting power and speed.

Fault Codes / DTCs

The primary diagnostic trouble code associated with this issue is:

Code	Description	Module
P0606	Control Module Processor	PCM

Diagnosis / Trigger Conditions

To diagnose this issue, technicians will use a Scan Tool (such as wiTECH) to verify system functionality. If other DTCs or symptoms are present beyond those listed in this bulletin, they must be addressed first. The repair procedure for the Alfa Romeo Stelvio P0606 issue is applicable if your vehicle's VIN is listed in the RSU VIN list or if it exhibits the described symptoms.

Repair Procedure Summary

The repair for the Alfa Romeo Stelvio P0606 involves inspecting and potentially reprogramming the Powertrain Control Module (PCM) with the latest available software. This vehicle is equipped with two Engine Control Modules (ECMs), referred to as Primary and Secondary PCMs, both of which require updating.

1. VIN List Check: The technician will first confirm if the vehicle's VIN is on the Rapid Service Update (RSU) VIN list. If not, they will proceed based on the presence of symptoms.
2. Software Version Check: The current software version of the PCM will be checked. If the latest software is already installed, the RSU is considered complete.
3. PCM Reprogramming: Both the Primary and Secondary PCMs will be reprogrammed with the latest software using the wiTECH Diagnostic Application. The Primary PCM must be programmed first, followed by the Secondary PCM.
4. Control Unit Routines: After reprogramming, specific routines such as "Control unit reprogramming" and "Oil level sensor replacement" will be performed in wiTECH, located in the ECM and ECM2 “Misc. Functions” menu tabs.
5. DTC Clearance: Any diagnostic trouble codes that may have been set during the reprogramming process will be cleared.

Required Tools or Parts

Technicians will require a wiTECH or Equivalent diagnostic scan tool to perform the inspection and reprogramming procedures.

Important Warnings

• Failure Code Usage: Dealers must use the appropriate failure code. The "RF" (Required Flash) failure code is mandatory for essential module flash/reprogramming when the VIN is included on the RSU list. If the customer's concern matches the symptoms described in the TSB, the "CC" (Customer Concern) failure code should be used, requiring a detailed description of the concern.
• Battery Voltage: During the flash process, a battery charger must be installed to maintain battery voltage between 13.2 and 13.5 volts. Voltage must not drop below 13.2 volts or climb above 13.5 volts.
• Ignition and Engine Conditions: Before performing certain control unit routines, the ignition must be in the ON position, the engine OFF, and the engine temperature must be above 80 °C (176 °F).
• Interrupted Flash: If the flash process is interrupted or aborted, it must be restarted.

Owner Action

If you own a 2023 Alfa Romeo Stelvio and are experiencing a Malfunction Indicator Lamp (MIL) illumination, a P0606 - Control Module Processor DTC, or your vehicle is going into limp-in mode, you should contact your authorized Alfa Romeo dealer. This repair, identified by TSB 18-003-25 REV. A and RSU 25-037, is reimbursable within the provisions of your vehicle's warranty.

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Source: NHTSA ID: 11015905