Many owners of many vehicles report this issue, so am guessing it's not a big problem. The vehicle crawls in reverse or any forward gear until things warm up; normally just a few seconds. ~Thirty seconds has been the longest when it was ~10F outside (car garaged though).
I've owned thirty vehicles but very few automatics. Does anyone know more about them and have an explanation for what is happening?
It has 32K miles now and at 24K miles I did change the Toyota WS entirely out for Redline D6 (because I tow, though original fluid turned out to look fine). It's tricky to verify fluid level but I am very detailed and am sure it was correct; re-checked a week later. Also pan was dropped and filter changed.
Am thinking to pull the battery overnight and reset the ECU. Could add a little more fluid for a week (I don't drive far most days).. fluid expands when warm so maybe a little low?
Also the car has sat for three->four weeks several times this year. On my return it did the same thing just the first time; vehicle crawled for ~five seconds and then it was totally fine including on restarts (until I brought it back to Denver where mornings can be really cold).