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
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