2022-2024 Alfa Romeo Stelvio Check Engine Light & DTC P0606-00

Owners of 2022-2024 Alfa Romeo Stelvio vehicles may encounter a persistent Check Engine Light, also known as a Malfunction Indicator Lamp (MIL-On). This condition can sometimes be accompanied by a noticeable reduction in vehicle performance, known as a "Limp-In condition." If your vehicle displays these symptoms and a diagnostic scan reveals Diagnostic Trouble Code (DTC) P0606-00, it indicates a specific internal issue with the Engine Control Unit (ECU).

This manufacturer communication, identified as S2418000016 and released in December 2024, addresses these specific concerns. It provides guidance for technicians encountering the "MIL-On/Check Engine Lamp On" and "Limp-In condition" alongside the P0606-00 fault.

Symptoms You Might Experience

If your Alfa Romeo Stelvio is affected, you might observe one or both of the following conditions:

• "MIL-On/Check Engine Lamp On": The Check Engine Light illuminates on your dashboard, indicating a detected issue with the vehicle's emissions or engine management system.
• "Limp-In condition": The vehicle may enter a reduced power or "limp home" mode. This typically occurs during the same key cycle as the Check Engine Light activation, limiting performance to prevent further damage.

Fault Code and Its Meaning

Upon further investigation by a technician, the primary diagnostic trouble code associated with these symptoms is:

• P0606-00: This code signifies "ECU Internal Performance set in ECU1 (Engine Control Unit 1)." It points to an internal malfunction within the vehicle's main engine control module.

Important Warnings for Owners and Technicians

This manufacturer communication S2418000016 contains critical advisories:

• Do Not Replace Components: The document explicitly states, "If the above conditions exist, replacing any components will likely not repair the issue." This means that attempting to replace the ECU or other related parts will probably not resolve the underlying problem.
• No Warranty Repairs Authorized: "This document does not authorize warranty repairs." Owners should be aware that this communication is for informational purposes for technicians and does not automatically cover the cost of diagnosis or any potential future repairs under warranty.
• Issue Under Engineering Investigation: The root cause of the P0606-00 fault is currently "under engineering investigation at this time." This indicates that the manufacturer is actively working to understand and develop a permanent solution.

Current Recommended Action

Given that the issue is still under investigation, the current guidance for technicians is straightforward:

1. Erase the DTC: Clear the P0606-00 fault code from the vehicle's system.
2. Return the Vehicle: Hand the vehicle back to the customer.

This temporary measure acknowledges the ongoing investigation and advises against premature, ineffective repairs.

What Owners Should Know

As this is an active engineering investigation, a definitive repair procedure or software update is not yet available. If your 2022-2024 Alfa Romeo Stelvio exhibits the "MIL-On/Check Engine Lamp On" or "Limp-In condition" with DTC P0606-00, it's important to understand the current situation. Your dealer will follow the manufacturer's guidance, which involves clearing the code and returning the vehicle.

Should the issue persist or if technicians require further assistance, they are instructed to "Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no solution is found." This ensures that the manufacturer gathers more data and provides updated guidance as the investigation progresses.

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Source: NHTSA ID: 11011713, Manufacturer Communication Number: S2418000016