I bought it from GM parts direct like 5 years ago. They are probably not available any longer. The hydroboost on my Yukon still going strong after 50k miles.
Swap out the relay for another one, report back.
If this continues with the same issues after swapping the relay. Get the wiring diagram for the fuse block. I suspect its a component that is bad and not the relay or fuse.
How long have you own this vehicle? Do you know the maintenance history? How many miles are on the suv?
I suspect the fuel pump heats up then shutdown the suv. Fuel pumps don't ever show codes.
I read one of the posts that something gets hot then shuts down, are you referring to the fuses or...
You mention the steering gear on the post thats why I was thrown off.
Is the steering feel loose or to soft.
If its loose you may have a bad rack and pinion. If is soft add a steering stabilizer.
I purchased a new Edlemann rack and pinion for my son's silverado and its he has not had any issues with it in 4 years.
https://www.rockauto.com/en/catalog/gmc,2007,yukon,5.3l+v8,1433252,steering,rack+and+pinion,7388
Have you checked the front hub bearings or the rack and pinnion?
What brand parts are you using? Aftermarket parts are junk. They are good for about 20k miles at best.
I personally think it's the rack and pinion. The internal components wearing out and start making funny noises.
These engines are known for the seals to go out after 120k miles. Did the shop tell you what seals are leaking?
Most common failures
Valve cover gasket
Rear main seal
Valley cover gaskets
Oil pan gasket
Oil cooler gasket
I have seen these LS engines go past 300k miles with no overhauls. I...
I have fixed two of them in the past and it's not worth it. You will be chasing cracks once you start moving the dash as you fix it and results might not be to your expectations.
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