Hi all,

I have a '09 Sierra 1500 crew 5.3 V8, and today I started experiencing oil pressure gauge problems. I have read a lot on here and other forums about something similar, but I haven't exactly found someone having the same problem yet.

I was driving and the oil pressure gauge shot to 0, check engine light came on. Truck drove normally besides this, no warning messages or beeps. I checked the oil when I parked--everything looked fine. I left about an hour later; this time, the gauge shot up to 80 max and stayed there with the check engine light on. It didn't fluctuate except for once when I braked, and it shot down to 0, but back up to 80 when I began moving again, where it has stayed since. Truck feels like it is driving completely normal.

Any idea? Of course the sensor itself, I've read a lot about the OP sending unit and the filter, but everyone seems to be getting a read of 0 and tons of warning messages where mine is acting a big differently.

I would firstly inspect & clean the electrical wires going into the OP Sender.
Sometimes things can get coated with oil, and a little contact cleaner may restore contacts.
Otherwise, try replacing the Sender with a Delco replacement part.
My Pk Ave had drops to zero and back up again, it turned out to be the OP sender.

Oh & I totally forgot to to say...
Welcome to the Forums Jerick!
Feel free to post some photos of your truck!
In Your Ride section we select rides for Car Of the Month as Well.
Follow the link in my signature, Photos are always appreciated !

99% of the time the oil pressure sensor is shorted internally, causing the gage to peg 80 psi all the time. Very common on these trucks.