On cold starts my truck makes this sketching sound

Pdihno · January 26

Iv noticed over the past week or so that every time I cold start my 2021 gmc sierra 5.3 it makes this weird sketch / whining sound for about 2 seconds when cranking then goes away. Only on cold starts it makes this sound. If I go out and start the truck after driving it does not make this sound. Anyone else experience this problem or knows what it could be. It’s driving me nuts my truck only has 40000km.

PunchT37 · January 26

My `25 does the same thing since new. 5.3 10 speed. Doesn`t sound like engine.

newdude · January 26

42 minutes ago, Pdihno said:

Iv noticed over the past week or so that every time I cold start my 2021 gmc sierra 5.3 it makes this weird sketch / whining sound for about 2 seconds when cranking then goes away. Only on cold starts it makes this sound. If I go out and start the truck after driving it does not make this sound. Anyone else experience this problem or knows what it could be. It’s driving me nuts my truck only has 40000km.

IMG_5997.mov

Normal. Engine oil pump "rrrr" or "rasp". Its due to the gerotor design of the oil pump.

PunchT37 · January 27

Don’t gen v’s have vane style pumps?

s10dragracer888 · January 31

My 4.3 did it too. @newdude is right. Nothing to be concerned about.

mnmarlin · February 28

My '09, the '14, and my current '19 all do it (all with 5.3's, although they are not the same 5.3's obviously). In fact my '97 Suburban with 5.7 does it as well. I had that one looked at by a dealer as it was in for a leaking intake manifold gasket and it was reported as normal.