By your description, yes your problem may be in the oil pump, pickup screen. and/or clogged oil channels going into your valve cover /upper valve chamber. The ticking you hear is on the valve lifters and/or rocker arm.
Remove a valve cover, start the engine and see if an ample flow of oil is reaching the valves. Turn off the engine and inspect the oil inlet and return channels for sludge build up.
Not knowing your specifics I don't know where the oil sensor is located but it is probably accurate. Chev uses a side mount and internal oil pump if I recall. Either way yo may have to drop the oil pan to inspect and clean the pickup screen.
If the issue is in the oil pump it could be a damaged cam lever or pump chamber is clogged with grease-like debris. An old shade tree mechanic solution( which I have used successfully several times) was to warm the engine, shut it off, drain and save the new oil then refill with a gallon of diesel or kerosene to dissolve clogged oil chambers/channels. Run in place for 5-10 minutes or until the tapping goes away. Drain the kerosene and check for metal slivers, globs of sludge etc.This is at your own risk because if you have worn bearings that are only being held in place by sludge it could throw one. I suspect excessive sludge. This is a possible solution and if not resolved promptly, your valve guides will wear quickly and you'll be looking at an engine tear down.
The next step would be to remove the oil pump and inspect for clogs or wear. Note there may be a port directly on the pump which can be used to attach a meter for oil pressure at the pump--check your shop manual for your model. As an alternative you can add a half gallon directly to the oil and drive for 15+ miles but you will have to drain that oil/kerosene mixture and dispose of it. Good Luck.
SOURCE: ticking noise and low oil pressure
DOES IT HAVE A LOT OF MILES ON IT OR MAY BE THE OIL PUMP IS IS GOING OUT? THERE IS A SPRING IN THE PUMP THAT IS A BYPASS FOR HOW HIGH PSI IT MAY HAVE BROKE THAT WILL GIVE YOU LOW PSI.
SOURCE: I have a '93 chevy silverado 1/2 ton with oil pressure problems
Sounds like the engine bearings (crankshaft) are worn. Try using a heavyer grade of oil, unless you want to rebuild the engine.
SOURCE: i have a 2005 chevy silverado 1500 2wd 5.3. my
Check the wire behind the guage.If not tight it will make the hand bounce.
SOURCE: changed oil pressure switch,still no oil pressure
The fuel pump on that model runs through the oil pressure switch so that if the truck looses oil pressure,It kills power to the fuel pump to prevent engine damage.you need to find the cause of the low oil pressure reading(possibly a bad oil switch).That would be the cheapest place to start,or have it checked with a mechanical gauge.Good luck,
ChevRev
SOURCE: 2005 chevy silverado with low oil pressure
You should replace your oil pressure sensor its cheap and easy to do...
Steve
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