Hyundai Tucson Owners & Service Manuals

Hyundai Tucson: Idle Stop and Go (ISG) System / Calibrating the Battery Sensor

If the AGM battery is reconnected or replaced, the ISG system does not operate immediately. If you want to use the system, the battery sensor needs to be calibrated following the procedure.

1. Turn off the engine.

2. Disconnect all electronic devices that were additionally installed after the vehicle was delivered, such as navigation, dashcam, etc.

3. After 4 hours with the engine off, turn the engine on and off 3 to 4 times.


The ISG system may not operate in the following situations.

- There is a malfunction with the ISG system.
- The battery is weak.
- The brake vacuum pressure is low. If this occurs, have the vehicle inspected by an authorized HYUNDAI dealer.


  • Use only a genuine HYUNDAI AGM battery for replacement. If not, the ISG system may not operate properly.
  • Do not recharge the AGM battery with a general battery charger. It may damage or explode the AGM battery.
  • Do not remove the battery cap. The battery electrolyte, which is harmful to the human body may leak out.
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