2001 Yukon xl
My oil pressure gauge goes from 40 to zero
while driving and makes a knocking noise
but when I first start it holds pressure to 40 I
soon as I step on da gas the meter waves
It could be the oil pressure sending unit, or the oil pump itself.
If you here knocking it wont be a bad sending unit,you have a bad oil pump.
Yep oil pump, don't continue to drive it you will wipe out the engine if damage hasn't already been done.
Looking for a Used Yukon XL in your area?
CarGurus has 15,372 nationwide Yukon XL listings starting at $1,900.
Search GMC Yukon XL Questions
GMC Yukon XL Experts
Related Models For Sale