I have had same issue last Friday(Jan 7,2022) it was -24 celcius Had to get the van towed as I could not get more than 15km/h. They said there was a pinched wire near the throttle box and they fixed it. Yesterday it was -25 and the engine light came back on. I was lucky this time as I was able to make it to the dealership. They plugged it in and again it was same code as last week, it was related to the throttle body. There were 2 Carnival with same issue at the dealer that morning. Today the dealership called to advise that they had done a lot of tests as per KiaTech and I was told that there were a large amount of Carnivals in Quebec with same issue. They were told not to do anything as of yet. KIA wants to investigate this further before they start changing parts. Biggest issue is that my $50K+ vehicle cannot be driven if it's too cold outside. Hope they can find a solution quickly. I guess these vehicles were not made for the North American winters.
UPDATE: Our van was brought in for the 3rd time with the same code again Jan 11th. Dealer claimed it was "safe to drive" however i don't even leave the driveway and the code is popping up,( how is that safe?) along with now a massive engine vibration. I contacted Transport Canada twice (filed a online report, as well as phoned to talk to someone) The transport Canada guy on phone was super helpful. He stated that if the dealer says its safe to drive, request that in writing on the work order. The biggest issue is i have been fighting weeks on end since this first happened on Christmas eve and the dealer refuses to do anything, which means that every time i bring it in i am without a vehicle. In there eyes i don't qualify for a rental because either work needs to be done or a part is on backorder. Of which there is no fix (at this time)
It is a 50K vehicle sitting at the garage for days with apparently according to my dealer a bucket of unknowns. also the customer service is just beyond me.
So i requested the following day (still without a car to get to work) that the service manger write and sign stating he said the vehicle with the engine light is in fact safe to drive. His response was exactly what i needed "its illegal to write that it is safe because there is a fault code in engine which misfires and the plate gets stuck" <which means its not safe.
So I stated i was in contact with transport Canada and now there looking into this matter as obviously its a road hazard if you loose acceleration. I also said i need to rental. So he said give him till end of day.
So I then called Kia Canada and there tone really changed when i expressed transport Canada advised me not to drive the car, also according to the man i spoke with at Kia Canada if i drive the vehicle with the check engine light on and more issues happen, my warranty will be void. Kia Canada finally stated to me after all my complaints with the dealer and this van that they would be in contact with my dealer. so finally after HOURS and Days making calls I have a rental sitting in my driveway that Thursday afternoon. 48 plus hours with no vehicle. Return on Rental is Feb 11th. So my dealer says kia Canada is working on a fix. (i have high hopes for Feb 11th)
My advise. Don't drive the van. Fight with Kia and fight with the dealer. Its not like we all bought a 6$ pair of socks. Kia needs to get there shit together and find a fix for this van.