KIA Optima Hybrid 2013 - Manual (Page 378)

H7
✽ ✽
NOTICE
In the hybrid system, the engine auto-
matically runs and stops. If the hybrid
system operates, the "READY" symbol
is illuminated.
In the following situations, the engine
may turn on and off automatically:
- When the hybrid battery is dis-
charged
- When the hybrid battery reaches a
certain temperature.