I have a 2007 chevy silverado. It was low on oil. I put 2 quarts in, oil light went off. When I drove it the low oil pressure light came on and also said engine shut down. What could be causing this...

If its reading low oil pressure I would first change your oil and filter.A clogged oil filter will cause your oil pressure to drop.Also remove your pressure sending unit and hook up a direct oil pressure guage to see what your actual pressure is.Its very possible that your oil pump could be bad.Those would be the most probable reasons for low oil pressure.The engine shut down means that your your engine has a fail safe to protect your motor from blowing up.

Oil sending unit, on top of engine ,in very rear , there is no dist on that model ,on top of motor, its a bear to get to ,but you can do it, un plug ,unscrew and reverse, some cussing and fussing may be required