2011 Chevy Malibu will not reverse

It could mean

• There is a problem inside the transmission causing the reverse system not to work. It could be a broken internal gear, or a problem in the hydraulic control system or any number of other failures. The fix here is to replace the transmission. Sorry big $$$ to fix.
• Its possible that there is a problem with the transmission control linkage between the shifter handle and the transmission. I've seen troubles here with bent linkage rods (although that was a manual transmission). I've also seen a cable operated system with a broken plastic bushing that caused the car to not shift correctly. Easy, peasy $4 fix. I will say on that car the owner had some notification of the trouble. The previous day, the car wouldn't start (as the neutral/park safety switch wasn't set correctly...)

Generally you may have some indications of troubles. Loud clunk noises? Other odd transmission behavior? Troubles with transmission fluid levels? Excessive mileage ( greater than 185,000 or so) ?