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A bad oil sending unit, a bad oil sensor.
Probably a faulty sending unit inside the fuel tank, not uncommon for GM.
It is in the fuel tank ---- part of the fuel pump ---
The oil pressure sending unit on a 2005 GMC Sierra
in the fuel tank
Inside the oil pan!!!! It is part of the oil pump.
Under the hood.
The fuel pump is located in the fuel tank and is attached to the fuel sending unit.
Where is the oil pressure sending unit located on a 2004 4.8 L V8 GMC?
If you are have fuel gauge problems I would suspect the sending unit in the fuel tank to be at fault. Rarely the gauge is the problem.
Remove the front grill to access the headlights.
on the engine