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I assume this car has a warning light. You should have a mechanic remove the oil pressure sender unit and replace it with a gauge. This will show what is really going on. I suspect the sender is faulty.
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www.fixya.com/cars/t7880379-oil_pressure_drops_zero_idle_2002_gmc Jan 18, 2011 - You could have three possable problems that I can think of. 1) Your oilviscosity is too low and you need to change it to a higher level. A 5w/30 .
When engine is idling the oil pressure sign can come up and that is OK. However if you've noticed that gauge shows much lower oil pressure that a bad sign. Show it to knowledgeable mechanic (but don't be lured in the engine replacement; ask for a root cause - it may be oil receiver or oil pump). Also I hope there's no oil puddles under the car? What about oil level?
It is very possible that the stepper motor that drives the gauge is going bad and needs to be replaced. There are services that repair clusters, check on Ebay.
you need a new cluster if you have less than 75,000 miles check with the dealer gmc issued a recall for that, if your over that look on ebay for a replace or repair service
You need to replace the oil pressure sending unit, this is what tells your gauge what the pressure is. For future information if your oil pressure drops again and its a real failed oil pump within a few minutes you will internally damage the engine. I would get a new Oil Pressure Sending Unit. Let me know if you have any questions.... Thanks!
An oil pressure sending unit is really not an expensive item nor difficut to change . Probably the answer , sending units faulter frequently. Hope this helps
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