2002 Suburban LT 1500- almost 200K miles. Original power steering pump.

My problem is that I got stuck in marshy mud yesterday. I tried Hi and Low 4WD to back it out. I didn't try too long, as I could see I was only getting buried deeper. A nice young man with a Ford F-150 pulled me out. Embarrassing. Anyhow, I noticed that my power steering no longer worked after I got out. It was working during my extrication. Not much mud underneath, I didn't see any leaks indicating a broken line, I opened the PSF reservoir and there was fluid in there, I did notice that there wasn't much swirling of fluid like there usually is.

Likely that the pump failed? Is there by chance a fuse for power steering on these vehicles?

 

Pump failed or maybe a line hard point to the cooler was crushed restricting flow. In my experience they go bad by leaking from the front seal long before they quit pumping. I'd trace all of the lines first before changing the pump.