These instructions apply to the Mitsubishi ASX Mk1 (GA) 2010-2023.
For other models, please choose your vehicle here.
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
- With the engine running, find the AS&G OFF button on the dashboard (marked with an “A” inside a circular arrow).
- Press it once. The warning light illuminates to confirm the system is switched off.
- 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:
- Disconnect the driver’s seat belt from the buckle, or
- Open the driver’s door.
- 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.
Independent guide — not affiliated with Mitsubishi. Always follow your official service manual and safety precautions. Read our full disclaimer.