GMC Yukon Oil Pressure

in GMC
I have a 2005 Yukon Denali with about 78k miles. I've had my gauge cluster replaced. My oil pressure gauge drops to zero and then comes back up.
Specifically, I have to drive about 70 mph (I don't regularly do that) and let of the gas. After I've been driving for some time, the oil pressure will go down until I hit the gas again. It happened first about a year ago during the summer on a long trip. It happened again about two months ago at the beach. This past week it happened a lot.
Am I looking at a bad oil pump? Could it just be the sensor?
Thanks.
Specifically, I have to drive about 70 mph (I don't regularly do that) and let of the gas. After I've been driving for some time, the oil pressure will go down until I hit the gas again. It happened first about a year ago during the summer on a long trip. It happened again about two months ago at the beach. This past week it happened a lot.
Am I looking at a bad oil pump? Could it just be the sensor?
Thanks.
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Comments
thanks
Best of luck.
I know it's been a while since this topic began, but I hope someone will pick it up again. I have the opposite problem. I have the oil pressure gauge reading all the way high (pegged at 80+ psi) since my last DIY oil change. I thought perhaps I had overfilled, so I drained it bit by bit and checked to see if the pressure would drop. It did not. Eventually the "check oil level" light came on and I measured the amount of oil I'd removed. It was almost 4 quarts. So I refilled it and let it sit overnight. Still no change. Do you suppose the pressure is actually that high? Could it be a bad gauge, switch, pump? Runs fine, otherwise. 2005 Yukon XL C1500. Thanks.
For the benefit of future readers, I replaced the oil pressure switch/sensor, and everything is fine again. Reads at 40-45 psi, as usual. It was a bear to reach and disconnect. But I managed, and I assure you I am not the most mechanically inclined among us. Youtube and google for instructions and diagrams. Once you know what you're looking for and have a good angle on it, it's pretty simple. The part was $52 (plus $8 for a deep socket I needed and did not already own), compared to $300 dealer service dept estimate.