I had to have my entire steering gear/ rack and pinion replaced after my steering completely went. I just got my truck back yesterday. Below is a brief summary of what happened.
On 5 separate occasions, my power steering completely failed. The first 2 times were all coming to a stoplight, at around 15-5 MPH a "POWER STEERING SERVICE UNAVAILABLE" warning would flash on the instrument cluster and the steering was stiff as all hell. This would only last for a second or two then the steering would return to normal. These all happened about a week apart of each other so it's briefness and intermittency was not too concerning. That is until I was rolling down the highway going 75 MPH and my power steering goes completely out for 15-20 seconds until I could pull off to the shoulder and come to a stop. This is easier said than done because a truck full-size truck with 12.5 wide tires is a bit of a handful to reel in sans power steering.. I gave the wheel a few jerks and it snapped out of its episode, so I went about my day with my hands clenched tight because I thought it was going to go out again at any moment. The following two mornings steering went out twice more just after starting the truck and making it maybe 30 seconds away from my house, both were momentary losses.
I take the truck to the dealer and there are several codes thrown ( voltage codes, and something about implausible data right front hub maybe some others didn't have a chance to write down the full codes, sorry guys I'll get them later though). They take it in and have a look at it and say the power steering gear has been binding up, causing the failure. Here's the kicker, this apparently happened to the shop foreman's truck as well as a couple of other 2019's that my dealer services and they are apparently using a revised part due to these failures (it's a wonder I haven't seen it come up on the forum if it's that much of an issue though).
The codes thrown were "c2129-17" as well as some other voltage codes. Here's the ticket post fix.
https://**************/community/threads/power-steering-failure.2655/#lg=attachment6167&slide=0
https://**************/community/threads/power-steering-failure.2655/#lg=attachment6169&slide=0
You can read the whole thread over at 5thgenrams if you want.
https://**************/community/threads/power-steering-failure.2655/