The link to video that "JimCost2014" posted. And reply by "Spendit" are both excellent starting points. And you can get a new negative battery thru Rockauto or GM Partsdirect,com . One of these 2 should be cheaper than going thru your local dealer.
My 2017 5.3 @ 41k miles will read 20 psi. hot idle especially after interstate driving. Normal city driving hot idle reads maybe just a little higher. Normal driving oil psi. runs much like yours slightly under 40 psi. Been that way for I as long as I can remember.
If you are in Cali. you maybe covered on injectors. I would check with dealer I thought I seen somewhere that in Cali. injectors fell under a special coverage bulletin. 10 years or 150k miles sure can't hurt to ask.
My 2017 5.3 with 33,5xx miles on it is at the dealer now with a ticking lifter. Service Advisor called late in the day 10/12 said parts ordered, but 1-11/2 weeks out due to being back ordered. Didn't say which particular part was back ordered. Took the truck in AM of 10/12. A little back ground, dealer oil changes ever 4k since new. And a Range V8 since 3500 miles .Truck does see alot of short trips as it's my run around the farm truck. Usually my wife takes it in for oil changes, and I just check it to make sure the oil filter isn't leaking and the oil level is correct when she brings it back.
Check the Youtube video where the guy tapped and plugged the Tstat valve body. Probably your cheapest option at this point. Just search 6l80e T-stat delete on Youtube. The way it is right now I think the fluid will mainly be going thru the trans T-stat valve body and back to the transmission and mostly bypassing the trans oil cooler.
Did this fix on my truck 4 days ago and the steering has been quiet ever since. Thanks for posting this.
Just looked on Autotrader Mtn. View Chevrolet in Chattanooga, TN has a White 2500 LT Z71. So they are on the ground so to speak. Biggest thing I wasn't to crazy about was the wheels on the truck.
OK so update on the truck. They found a rodent nest under the fuse box on the driver side front wheel housing. They had chewed on the wiring going to the fuse panel and the chewed up wires where touching each other. The fuse panel was shorted out from rodent pee. New fuse panel and a bunch of replaced wiring and all is good.
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