2024 Subaru Impreza RS 2.5L ECM: The Critical 10/05/2023 Build Date

Critical Compatibility Warning: Read This First

The key OEM part number for this specific module is 22765AS671, which supersedes the earlier number 22765AS670. A different part number, 22765AS672, is used for vehicles built from October 6, 2023, onwards. Before purchasing a replacement, you must verify your vehicle's production date. This can be found on the sticker located on the driver's side door jamb. Matching the part number on your original ECM is the most reliable way to ensure compatibility.

Symptoms of a Failing ECM

A failing ECM can cause a variety of symptoms, ranging from minor annoyances to critical failures that leave the vehicle undrivable.

• Check Engine Light: This is often the first indicator. Specific diagnostic trouble codes (DTCs) pointing to internal processor failure (like P0601, P0606) or communication errors (P0600) are strong signs of a bad ECM.
• Engine Performance Issues: You may experience rough idling, stalling, engine misfires, poor acceleration, or reduced fuel economy as the ECM struggles to manage the engine correctly.
• No-Start Condition: One of the most common symptoms of a completely failed ECM is the engine cranking but refusing to start. This can happen because the ECM is not controlling the fuel injectors or ignition coils.
• Intermittent Problems: The vehicle may run fine when cold but start having issues as it warms up, or problems may appear and disappear randomly. This can be caused by failing internal components or cracked solder joints within the module.
• Communication Loss with Scan Tools: If a diagnostic scan tool cannot communicate with the ECM, it's a major red flag that the module itself may have failed.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

As of early 2026, there are no specific recalls or TSBs directly targeting the ECM for the 2024 Subaru Impreza. However, several related campaigns are relevant:

• NHTSA Campaign Number WRA-24: This recall addresses an issue where the instrument panel harness may rub against the steering beam bracket, potentially causing a short circuit and a loss of drive power. While not an ECM failure, the symptoms could be similar. Dealers will inspect the harness and add protection or replace it if damaged.
• NHTSA ID 23V-754 (Subaru WRP-23): This safety recall for certain 2024 Impreza models involves front drive shafts that could crack and break, leading to a loss of motive power.

It is also common for manufacturers to release TSBs that involve reprogramming the ECM to fix software-related issues, such as correcting conditions that trigger false diagnostic trouble codes. Owners should have their dealership check for any open campaigns or available ECM software updates anytime the vehicle is in for service.

Programming and Immobilizer Requirements

After physical installation, the module must be registered to the vehicle's immobilizer system. This process 'teaches' the new ECM to recognize your car's keys. If this step is not performed, the car will not start. This programming requires specialized diagnostic equipment, such as the Subaru Select Monitor (SSMIII) used by dealerships, or a capable aftermarket tool with J2534 pass-thru functionality and a subscription to Subaru's technical information service. While some advanced independent shops or automotive locksmiths may have this capability, a dealership is the most reliable option for ensuring proper programming.

Buying a Used 2024 Impreza ECM

Purchasing a used OEM ECM can be a cost-effective solution, but careful verification is essential.

• Verify the Part Number: The most critical step is to match the OEM part number exactly. For this specific application, you are looking for 22765AS671. Do not purchase a module with a different number, even if it looks identical.
• Confirm Donor Vehicle Specs: Ensure the used ECM comes from a 2024 Impreza RS with a 2.5L engine and a production date on or before 10/05/2023.
• Physical Inspection: When you receive the used module, inspect it carefully. Look for any signs of corrosion on the housing or pins, bent pins, or evidence of water intrusion. The connectors should be clean and free of damage.
• Plan for Programming: Remember that even a perfect used ECM will not work until it is professionally programmed to your vehicle. Factor the cost of programming into your total replacement cost. Some services offer to 'clone' the data from your old ECM to the replacement unit 🎬 See how to clone a used Subaru ECU, which can simplify installation.

Replacement Cost Comparison

Prices can vary based on location and supplier. The following is an estimated breakdown of costs.

Frequently Asked Questions (FAQ)