This is an old thread and this has been mentioned before but I am going to bring it up again because it is a serious safety issue. When the ambient air temp sensor under the passenger side mirror fails it will disable the drive modes and the auto start, it will has cause the HVAC to not work properly. I found this out other day when I was driving while it was -10 F outside and went to put my 2015 TH into snow mode and it did not work. I noticed the service engine light came on and the outside temp was reading -- I got the code checked and it was P0073 ambient temp sensor. Today the temperature was above freezing and the error code was gone and everything was working again. This also happens with several other parts on the car when it is extremely cold out. I do not have a garage so I am not going to try a take apart the mirror and atempt to pull out the sensor and replace it when it is 5 degrees out. So now I have to decide to live with it and hope it does not happen to often or have the dealer put in a new mirror with the same crappy parts and wait for it to happen again. This is a known issue and the dealer told me today they have replaced several mirrors because of it. I use the drive modes, I had to park in behind my house the the other day and to get there I had drive up a step driveway then through over a foot of fresh snow. I hope one day they come up with a real fix or a forced recall to fix it.
