I had this same issue after a major cold spell in Seattle. Comfort access wasn't working anymore, but I could start the car by holding the fob near the steering wheel.
I ended up getting a trickle charger, and replacing the battery in the fob, that combination seemed to do the trick. Not sure which was the fix, but the fob battery was low in voltage, and so a fresh, greater than 3volt, new fob battery did the trick for me.
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