Cobalt LS. Also no noise for turn signals on. The actual signals all work. Have checked fuses. Very occasionally the noises will work, so it's on & off problem, but mostly not working.
Doesn't make ding noise for headlites left on or key in ignition when door open. on 2008 Chevrolet Cobalt
I have a 2008 cobalt with the same problem. The sound comes from the left front door speaker. When I removed the door panel found a loose and corroded connection, replaced door speakers with aftermarket. everything has been working fine since. hope this helps.