2013 Chevy Silverado 5.3; Low engine oil pressure

Asked by RusseyG Apr 29, 2021 at 07:07 PM about the 2013 Chevrolet Silverado 1500 LS Crew Cab 4WD

Question type: Maintenance & Repair

Okay so truck starts up fine, and runs fine for
about a half hour then the dash starts flashing
“low oil pressure stop engine now” and
beeping. This is the 1500 5.3l engine 70k
miles. It’s weird cuz the truck dosent have any
problems while it’s running. Purrs like a kitten.
Did some reading on the issue and followed
troubleshooting recommended by a mechanic
friend of mine.

We started by replacing the Oil pump
assembly (which is a pain to do in your
driveway without pulling the engine, or
dropping the oil pan). We started it up ran it
drove it about a mile and the truck ran even
smoother and then the same oil pressure drop
followed by flashing lights and beeping.

After this we replaced the oil pressure sending
unit, and the screen below it. Same issue. Ran
the code it was throwing and it said “oil
pressure sending unit performance” or
something like that. Sent it into a shop to have
them run a diagnostic and just have them
quickly change the oil and oil filter while it was
in there, and the best they could tell me was
that at 1000rpms it holds about 12psi and that
the code could mean the issue is somewhere
something on the interior of the engine is worn
out which seems odd to me on a truck with
less than 100k miles. Running it the oil
pressure seems to drop on idle, and rise on
acceleration until it just drops to zero and the
truck tells you to shut it off.

I’m truly at a loss for what to do at this point,
since registration is up, and I can’t pass
because of the code that keeps getting
thrown, and even if it did I can’t drive it
because the truck drops and tells me to shut
it off after the truck seems to warm up.

2 Answers


I posted circuit description for sensor performance. If you click on the text it will enlarge. On the sensor connector, you can check ref voltage--signal and ground. You might try an analog gage in place of oil pressure sending unit, just to double check oil pressure. My info for oil pressure says 6--65 psi, I suppose six being the lowest. The old rule of thumb used to be 10 psi for every 1k rpms. it's best to use proper specs. There are codes for hi senor voltage and lo sensor voltage for oil pressure sensor. good luck

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