bobbykart

I can't remember , is the battery a 2032? I have had many problems with
fob not being recognized. Start troubleshooting with a simple fob battery replacing

probono

2032 it is...just replaced mine after 2 years and 8 months and after the fob, left in the garage at 34 degrees, refused to lock or unlock the doors. When brought into the house and allowed to warm, it worked fine, but I thought I was on borrowed time.

Ken

djmichel

The 2032 is the correct battery. I just replaced batteries in both of my remotes. Easy to do and while do so, I checked voltage difference between old and new batteries. Old batteries were 2.7-2.8 volts dc. The new batteries were 3.3 volts. My old batteries were just hitting 3 years since the vehicle was new. I had random no fob recognized so to be safe I changed
the batteries. The original batteries would probably have worked down to 2.5 volts. I have found that iPhone proximity to the fob will prevent recognition.

TEXHAWK0

As others have found, even the unused fob battery will go dead at a out the same age as used one, so change both.

Grimlock13

Mine refused to work after 4 years, got the spare that was never used, it worked once then quit.

If it your only car, change both at 3 years.

JerryU

The FOB batteries appear to need voltage in the "new" area.

I have a battery checker that puts a load on the battery (depending on size) so it is giving a better value that just a voltage reading. With a digital volt meter the current draw is very low.

I had changed my 2014 C7 FOB battery after 2 years as a precaution. After a year that FOB was not always opening the door and then would not allow the car to start. I used my other FOB which had been in a draw not used for then 3 years. It worked for a short while then it was erratic.

Checked both batteries and they read just barely in the Green OK area. Bought two new quality batteries that read strongly in the Good range. Both FOBs worked fine!

Will change my Grand Sport FOB battery with a quality replacement after two years! Those cheap eBay batteries (and probably Amazon) are not worth using, IMO!

CVG993

Recently changed the batteries in both fobs on 2015, and work like a charm now. Had same issue where it would not unlock, and wouldn't recognize to start. Replaced and all good.