CircuitTrove [EN]

Last updated: September 16, 2026 Quick Take Auto start-stop is not designed to stop the engine at every light. Battery charge, cabin-climate demand, ambient temperature, seat belt, doors, hood, steering angle, and road grade can all inhibit operation. A persistent or flashing malfunction indicator needs the vehicle-specific service path.   Auto start-stop works only when its safety, battery, and climate conditions are satisfied, so check the displayed status and owner's manual before calling non-operation a fault. The phrase auto start-stop unavailable can describe a normal temporary inhibition or a system problem. The dashboard pattern and current operating conditions separate those cases.   Normal reasons the engine may keep running at a stop A Hyundai model-specific ISG manual lists battery charge, battery-sensor state, ambient temperature, climate demand, and vehicle warm-up among the operating conditions. Seat belt, doors, hood, brake vacuum, steering angle, roa...