I have a 2016 PMC and have experienced the same cold weather transmission issues. I’ve relayed this info on the forum previously, in response to a similar complaint but - because i feel your pain and had to figure out how to cope with this issue without assistance/any info- I wanted to pass along what I learned; hope it is helpful to you/others:
The first winter season I owned my PMC, it would “lurch” during the first few miles - when really cold. It even began stalling and shutting off in the mornings, within the first mile. When this occurred, it sometimes wouldn’t start - or would start and almost immediately shut off. Several dash lights came on (those listed in the manufacturer’s update notice/bulletin). I was about to return to the dealer but managed to resolve the issue myself.
“Hill assist,” electronic shift, ESC, etc. were all suddenly displaying a malfunction-“service required”
The check engine light simultaneously illuminated- with some of the codes referred to in the manufacturer’s bulletin.
After experiencing this a few times, I checked the oil level and it was low. I topped it off and the severe problems stopped.
I haven’t had an issue since - it still lurches a bit during the first few miles of severe cold temps- but less & tolerable. Think it is largely due to transmission fluid temp/engine oil level and temp.
1. As others stated: keep up with frequent oil changes
2. Check your oil level often
3. I also let it warm up for a few minutes and take it slow for the first few miles on particularly frigid mornings
That seems to work for my PMC. I agree it is an annoyance - seems like this particular year/model just wasn’t engineered for severe cold. I have experienced other issues with it, exclusively during cold temps -this goofy transmission behavior was def the most nerve wracking though.
I hope this helps somebody