It is a Federal mandate the ESP tell tale illiminate on start as a bulb check.
If the car with the squiggly line underneath illuminates momentarily it usually means ESP is active.
If the car with squiggly line and ESP/BAS light illuminates and stays on it indicates a fault. Most common fault is steering wheel not being straight followed by faulty WSS in my experience.
ESP in new JK's is sensitive, especially with oversized tires where the speedometer has not been calibrated. If driven aggressively ESP will likely engage.
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