Subaru’s Auto Start Stop (ASS) system automatically shuts off your engine when you stop and restarts it when you release the brake, aiming to improve fuel economy. Many drivers find this feature intrusive and wish to disable it, especially since the setting typically resets each time the vehicle is restarted. While there isn’t a permanent, one-time disable switch accessible through the infotainment system or a simple button press that lasts across all restarts, you can disable it for each drive cycle. Understanding which settings stick and which ones revert is key to managing this feature.

Disabling Auto Start Stop for the Current Drive

For most recent Subaru models, the primary method to disable the Auto Start Stop system is through a dedicated button. This button is usually located on the dashboard, often near the gear shifter or the climate controls. Pressing this button will deactivate the ASS for the current driving session.

To confirm it’s off, look for an indicator light on the ASS button itself or a corresponding message on your instrument cluster or infotainment screen. The exact location and appearance of this indicator can vary slightly by model year and trim level. Remember, this action is temporary and will need to be repeated each time you start your Subaru.

Understanding What Settings Persist

The critical point for Subaru’s Auto Start Stop system is that the deactivation setting does not permanently persist across ignitions. Each time you turn off your Subaru and then restart it, the ASS system defaults to being active. This is a deliberate design choice by Subaru to prioritize fuel efficiency and emissions standards. Therefore, you must press the ASS disable button every time you want to turn it off for that particular drive.

Other settings within the infotainment system, such as radio presets, climate control preferences, and seat memory positions, are designed to be persistent and will remain as you last set them after the vehicle is turned off and on again. However, the ASS system’s status is not among these persistent settings.

Confirmation That Auto Start Stop is Off

After pressing the Auto Start Stop disable button, you should receive a visual confirmation that the system is deactivated for the current drive. This typically involves an illuminated icon on the ASS button itself or a message displayed on your vehicle’s dashboard. For example, you might see an “Auto Start Stop OFF” message or the ASS icon illuminated in a specific color (often amber or red, depending on the model).

If you don’t see this confirmation, try pressing the button again. In rare cases, a model year or software update might slightly alter the confirmation method, so consulting your Subaru owner’s manual for your specific vehicle can provide the most accurate details.

Limitations and What to Expect

While disabling Auto Start Stop is straightforward for each drive, it’s important to understand that Subaru designed this feature to meet fuel efficiency and emissions targets. The system is integrated with your vehicle’s engine management and emissions controls. Therefore, there is no manufacturer-approved method to permanently disable it through software modifications or aftermarket devices that would bypass its intended function without potential unintended consequences. Attempting to permanently disable ASS through unofficial means could impact other vehicle systems, void warranties, or lead to check engine lights.

What to Do If the Setting Doesn’t Revert as Expected

If you find that the Auto Start Stop system is not disabling when you press the button, or if it unexpectedly reactivates during a drive, there are a few troubleshooting steps to consider. First, ensure you are pressing the correct button and that it illuminates as expected. Sometimes, a slight delay or a specific sequence might be required, though this is uncommon for ASS deactivation.

If the issue persists, it could indicate a minor system glitch. Turning the vehicle off completely, waiting a minute, and then restarting it can sometimes resolve temporary electronic issues. If the problem continues after these steps, or if the ASS button appears to be unresponsive, it is advisable to consult your Subaru owner’s manual for further guidance or contact a Subaru dealership for professional diagnosis and repair. The ASS system is tied to various engine and emissions controls, so any persistent malfunction should be addressed by qualified technicians.