These instructions apply to the Hyundai Kona Mk1 (OS) 2017-2023. For other models, please choose your vehicle here.
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Your Hyundai Kona Mk1 (OS, 2017–2023) has Hyundai’s ISG (Idle Stop & Go) system, which switches the engine off when you stop and restarts it as you pull away. It saves fuel, but some drivers prefer to switch it off in stop-go traffic or when manoeuvring. This guide shows how to deactivate it (and back on), and why it sometimes won’t engage on its own.
How ISG Works on the Kona
When you brake to a stop (automatic) or select neutral and release the clutch (manual), ISG shuts the engine down to save fuel. Lifting the brake or pressing the clutch restarts it automatically.
How to Switch ISG Off
- With the engine running, find the ISG / Auto Stop OFF button on the dashboard (marked with an “A” inside a circular arrow).
- Press it once. The ISG warning light illuminates and the display shows a message confirming the system is switched off.
- The engine will now idle normally at a stop.
How to Switch It Back On
Press the ISG OFF button again so the warning light goes out, or simply restart the car — ISG defaults back to ON every time you switch the ignition off and on.
Why ISG Sometimes Won’t Activate
Even with the system enabled, the Kona 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.
- The climate control is working hard in very hot or cold weather.
If ISG stopped working entirely after a battery disconnection, the battery needs to recharge — see our Kona battery guide.
Frequently Asked Questions
Does the Kona remember my ISG 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 ISG?
No. The Kona’s reinforced starter and AGM/EFB battery are built for it, and the system protects itself by skipping stops when the battery is low.
Why did ISG 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.
Can I turn ISG off permanently?
Not from the dashboard — the button is per-drive only. A permanent change would need dealer-level configuration, which most owners skip given the simple button.
If a warning light appeared alongside the fault, look up the code on autodtcs.com. To clear a service reminder, see our Hyundai Kona service indicator reset guide.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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