Oil pressure gage drops to zero

Asked by Sep 08, 2016 at 11:40 PM about the 1999 GMC Suburban K1500 SLE 4WD

Question type: Maintenance & Repair

My oil pressure gauge drops to zero and
comes back up and it constantly drops to
zero but it is full of oil. It's a 1999 gmc
suburban. Any ideas of what it could be is
greatly appreciated

2 Answers


When this happens it is always a piece of mind to have the oil pressure checked with a mechanical gauge. But if the motor is not knocking or ticking when your oil pressure drops, then there is more than likely a problem with the oil pressure sending unit, (the opsu needing to be replaced, and check the opening it is screwed into, may be plugged up), or the gauge on the dash, (not likely tho)

Yeah it don't make any noises or knocks or anything when the oil pressure drops. I'll check the oil pressure sending unit. Thank you for the response

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