Had a cardiologist appointment today and it also happened to snow today in Dallas.
Had no trouble driving through the snow whatsoever however on the way home, I got a check engine light stating service transmission and shift to Park however I couldnt shift to park and once stopped the truck would shut off (engine) itself but would not turn completely off.
I got it restarted and drove the last couple of miles home and looked at it in my driveway.
The ignition still would not go to the off position, only accessory and run which if left on would simply drain the battery. I ultimately had to disconnect the battery and set the emergency brake to get the truck to completely power down.
In doing some digging, I found that this is a common issue with these trucks with heavy snow or wet snow which is what we got.
I found this when climbing under the truck to check, it was indeed packed with snow
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So if you drive in heavy wet snow and get enough packed in under the truck, you may get a "Service Transmission" error and a failure of the ability to shift into park