Fluctuating oil pressure gauge

[DaveBarn]

I got a 14 Silverado with a duramax a couple months ago. The oil pressure has read high since I got it. The last couple days it has been fluctuating. I will try to attach some video to show what it is doing.  

Video 1 starting

 

Video 2 after starting

 

Video 3 after a few minutes driving

What could be causing this?
Thanks

[davester]

Could be anything, from a broken oil pump, to a bad oil pressure sensor (OPS), to a wiring/connector problem, to a computer problem.

 

Not likely to be a gauge problem, because you also are getting the low oil pressure warning when it goes to zero.

 

Personally, I would start with getting a mechanic pressure gauge and hooking it up in place of the OPS to verify that you are getting good oil pressure, then test if the sensor is working right, then check the wiring.

[508gm1]

It is interesting when your revolutions increase the oil pressure gauge decreases, almost in tandem together. I wonder if there is a shared ground connection somewhere that is starting to deteriorate. Hopefully someone on here will have an electrical diagram to see if it is a path worth exploring.

 

Checking oil pressure with a mechanical gauge is the best advise you have been given so far.

 

I assume your oil level is at the correct level.

[DaveBarn]

Oil is at the correct level. After the truck has ran for 5 minutes the fluctuations stop. Then the pressure gauge says it is almost 120. 

[Tie]

19 hours ago, davester said:

Could be anything, from a broken oil pump, to a bad oil pressure sensor (OPS), to a wiring/connector problem, to a computer problem.

 

Not likely to be a gauge problem, because you also are getting the low oil pressure warning when it goes to zero.

 

Personally, I would start with getting a mechanic pressure gauge and hooking it up in place of the OPS to verify that you are getting good oil pressure, then test if the sensor is working right, then check the wiring.

I think so too

 

[Tie]

19 hours ago, davester said:

Could be anything, from a broken oil pump, to a bad oil pressure sensor (OPS), to a wiring/connector problem, to a computer problem.

 

Not likely to be a gauge problem, because you also are getting the low oil pressure warning when it goes to zero.

 

Personally, I would start with getting a mechanic pressure gauge and hooking it up in place of the OPS to verify that you are getting good oil pressure, then test if the sensor is working right, then check the wiring.

Listen for the engine on the first startup if it's chattering chattering mean low oil pressure so it could be oil pump issue if there is no chattering electrical issue

[Tie]

Also opening the engine oil cover on the four start up listen to you see if you could see oil flowing spilling that means good oil pump or know your oil pump is working.