Turn the Auto Stop-Go System On or Off

Last updated: June 12, 2026

Your Mitsubishi ASX Mk1 (GA, 2010–2023) — on versions fitted with it — has an Auto Stop & Go (AS&G) system that switches the engine off when you come to a halt and restarts it as you pull away. It saves fuel, but some drivers prefer to switch it off in stop-go traffic. This guide shows how to deactivate it (including the seatbelt trick) and why it sometimes won’t engage on its own.

How Auto Stop & Go Works

When you brake to a stop (automatic/CVT) or select neutral and release the clutch (manual), the system shuts the engine down to save fuel. Lifting the brake or pressing the clutch restarts it automatically.

Option 1 — The Dashboard Button

1. With the engine running, find the AS&G OFF button on the dashboard (marked with an “A” inside a circular arrow).
2. Press it once. The warning light illuminates to confirm the system is switched off.
3. The engine will now idle normally at a stop.

Option 2 — Undo the Driver’s Seatbelt

The ASX also suppresses auto-stop when the driver isn’t belted in or the door is open:

1. Disconnect the driver’s seat belt from the buckle, or
2. Open the driver’s door.
3. With either condition present, the system will not stop the engine.

The button (Option 1) is the proper way to disable it for a drive.

How to Switch It Back On

Press the AS&G OFF button again so the warning light goes out, or simply restart the car — the system defaults back to ON every time you switch the ignition off and on.

Why It Sometimes Won’t Activate

Even with the system enabled, the ASX skips auto-stop to protect comfort and components when:

• The engine is not yet up to temperature (cold start).
• The battery charge is low — common after a battery change or lots of short trips.
• Cabin heating or demisting needs the engine running.
• The steering is turned, or the car is on a steep slope.

If it stopped working entirely after a battery disconnection, the battery needs to recharge — see our ASX battery guide.

Frequently Asked Questions

Does the ASX remember my AS&G setting?

No — it resets to ON every time you restart the car. Press the OFF button each drive if you prefer it disabled.

Is it bad to keep using Auto Stop & Go?

No. The ASX’s starter and battery are built for it, and the system skips stops when the battery is low to protect itself.

My ASX doesn’t have an A-button — does it have stop-start?

Not all ASX versions were fitted with Auto Stop & Go. If there’s no “A” button on the dash, your car doesn’t have the system and the engine idles normally at a stop.

Why did it stop working after a flat battery?

It only runs when the battery is well charged. After a jump-start or battery change it stays dormant until charge recovers; a few longer drives usually restore it.

If a warning light appeared alongside the fault, look up the code on autodtcs.com. To clear a service reminder, see our Mitsubishi ASX service indicator reset guide.