I went out to start my 2007 Camry hybrid after sitting over night in the subzero temps outside and it wouldn't fire up. When I pushed the button, everything came on on the dash like normal but then just died. Tried a couple of times and the same result. I know this car has two batteries. One being the hybrid battery which is less than a year old and a typical 12volt battery. Would it be ok to try and jumpstart the car from the 12volt battery.

 

Yes but before doing so download the owners manual at the site below and follow its guidelines for jumping the 12v battery plus see the link for Earnhard Toyota.

https://www.toyota.com/owners/resour...als.camry.2007

https://www.earnhardttoyota.com/blog...-toyota-hybrid

 

Cold temperatures could affect the chemical process inside the battery and reduce its ability to hold a charge. And yes your car still has a regular internal cumbustion engine that runs on 12 volts. There should be a red positive cap under your hood, hook the red to that then the black (ground cable) to a good ground.