Replacing the oil pressure sensor worked for my situation, it is definitely recommended to check your oil pressure by gauge to verify any low oil pressure situation. Thanks for watching... um.
The same thing happened to me about a 2013 avalanche test drive was awesome started driving home lost oil pressure but as soon as I would shut it off and turn it back on oil pressure came back which made me wonder if it was the gauge because I had no motor noise whatsoever so when I got home I tore into it replace the oil pump pickup tube and oil sending unit and screen never cured my problem so I knew that there was something else wrong so today I hooked up an external oil pressure gauge wow was I surprised cold start I had 80 lb of oil pressure when it warmed up I had 59 lb of oil pressure and I did put the high volume oil pump in with the high-volume tension spring now I think I got too much oil pressure but before I change the spring I need to know why that differs from the gauge inside my car so if any of you are having this problem hook up an external oil pressure gauge before you do any work to it..