Chevrolet Cobalt Owners Manual: Charging System Light

This light comes on briefly when the ignition is turned on, and the engine is not running, as a check to
show it is working. Then it should go out when the
engine is started.

If the light stays on, or comes on while driving, there may be a problem with the electrical charging system.

Have it checked by your dealer/retailer. Driving while this light is on could drain the battery.

If a short distance must be driven with the light on, turn off all accessories, such as the radio and air conditioner.