diesels and oil pressure

rickjf wrote:
Hi all,
having an oil pressure problem and I know there are many knowledgeable folks here. First, the basics.
its a 2012 gmc duramax with about 57,000 miles. We're full timing
so a lot of miles are towing a trailer. oil is not leaking, it is
not low. had oil changed 2000 miles ago.
pressure will be fine, and then, slowing for traffic, a stop sign or
light etc, the gauge will momentarily to 0, a chime goes off, and then it goes back up. I went to a dealer in Oregon a few weeks back,
and they said it was the sending unit, and we replaced it. Well, it happened again yesterday so its not fixed.
any ideas?

Sounds like a weak oil pump to me. Secondly there are two sensors it is possible that they replaced the Oil Level sensor not the Oil Pressure sensor.

Check that first. If it was me I'd replace that oil pump if there was any chance it could be worn or bad. Have them clean it out first and give it a test drive.