The 2023 Kia Sorento features Idle Stop & Go (ISG) with a button to disable the system when you prefer continuous engine operation. When this button stops responding—either failing to disable ISG or showing no indicator change—frustration mounts. Understanding the button's function helps diagnose the issue.
How the ISG Button Works
The ISG OFF button sends a signal to the engine control module requesting system disable. Pressing it should illuminate an indicator confirming ISG is disabled for this drive cycle. The setting resets each time you restart the vehicle—there's no permanent disable option from the factory.
Why the Button May Not Respond
Several issues can cause ISG button non-response. A stuck or failed button switch doesn't send the disable signal. Circuit wiring issues between the button and control module interrupt communication. Software glitches may prevent the module from recognizing the input. In rare cases, the button works but the indicator bulb has failed, making it appear non-functional.
Testing the Button
Proper testing determines if the button, circuit, or module is at fault. Pressing the button should produce a click feel. The indicator should illuminate or change. If no response occurs, diagnostic scanning reveals whether the module receives the button signal. Voltage testing at the button connector confirms switch operation.
Common Solutions
For stuck buttons, cleaning the switch contacts sometimes restores function. Failed buttons require switch replacement—often accessible without major disassembly. Wiring issues need tracing and repair. Software issues may resolve with module reset or update. Indicator bulb replacement is simple if that's the only problem.