Pontiac G6:

Service air bag

The AIR BAG indicator lighting up on the instrument panel while the engine is running tells us there's a fault in the Supplemental Inflatable Restraint (SIR) System, and a DTC (Diagnostic Trouble Code) has been stored in the Inflatable restraint sensing and diagnostic module (SDM).

It's going to require a technician with a diagnostic scan tool to read the trouble codes, check for any related technical service bulletins, and accurately diagnose and repair the problem.

A GM dealership is probably your best bet, but a qualified technician at an independent shop should be able to handle the job also.