My M has comfort access and the battery in the key does wear out. Just replace it and see if that resolves it. I notice that when the battery was getting low I had to get closer to the car to get it to unlock the doors and sometimes pressing the start stop button a few times. I replaced the battery and problem resolved. It takes about 3 minutes and a $6 battery. Good luck

No program is required after battery replacement?

Nope. I replaced both fob batteries and no adverse reactions.....

Sounds good. One of my fob's seems to be low on juice. I'll grab a couple new batteries today. Thanks.

Correct. Plug and play

I have noticed with comfort access on my 2011 that I can make the keyless start not work. Did it by accident.

If I have my keys in my pocket with my iPhone and the iPhone is blocking they keys, the car won't start. Makes perfect sense, so now my keys are in the opposite pocket.

Never had that issue with an iPhone, BB, Droid...nada. Maybe it's your leg? You happen to venture over to Japan recently? Specifically near the nuke plants? :wow:

Ordered 5 of them on amazon for $7ish shipped. Thanks again!

Well it was in my left pocket and the signal had to go through "stuff". ;)

My question is...where and how many sensors are in our trucks for CA?

It's weird...when I leave a fob in the center console and take one with me, I can lock the doors. The driver's side isn't supposed to lock if it detects a key is inside the vehicle. The keyfob inside's battery is fine so it's not like it's just a dead battery and the truck doesn't detect it.

Do we have a few sensors inside the truck in order to triangulate the position of the keyfobs? Or is it just one that uses some sort of radio measuring to detect and pinpoint where the keyfob(s) are?