2005 Pontiac Montana SV6 Owner's Manual - Page 211

Engine Coolant Temperature Warning Message Charging System Indicator Message The charging system battery symbol will come on in the message center when you turn on the ignition as a check to show you it is working. United States Canada This message will come on when your engine gets too hot. If this message comes on, it means that your engine coolant has overheated. If you have been operating your vehicle under normal driving conditions, you should pull off the road, stop your vehicle and turn off the engine as soon as possible. See Engine Overheating on page 5-25. It will remain on as long as the engine is not running. It should go out once the engine is running. If it stays on, or comes on while you are driving, you may have a problem with the charging system. It could indicate that you have problems with a generator drive belt, or another electrical problem. Have it checked right away. Driving while this indicator appears in the message center could drain your battery. If you must drive a short distance with the message on, be certain to turn off all your accessories, such as the radio and air conditioner. 3-47