2001 Yukon xl

Asked by Mar 16, 2016 at 10:24 PM about the GMC Yukon XL

Question type: Maintenance & Repair

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

3 Answers

685

It could be the oil pressure sending unit, or the oil pump itself.

1 of 1 people found this helpful.
64,395

If you here knocking it wont be a bad sending unit,you have a bad oil pump.

92,865

Yep oil pump, don't continue to drive it you will wipe out the engine if damage hasn't already been done.

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