My key fob is not working for my impala and I have tried the following to fix it:
- replace batteries
- check the signal (there is a signal)
- reprogram the key fob
- key fob works for a few minutes after the car is turned on and then off again
- removed the accessory fuses
I am open to try anything to get this to work again.

 

check is the battery retainer in the fob is loose or broken. it can be re soldered. may be a you tube video for it.

 

The fob isn't the issue. The car forgets the key fob even after it has been reprogrammed. The fob works for a few seconds after the car has been on.

 

Assuming your circuit board is good, you can buy bare key FOB on Amazon cheap. You likely have a bad circuit board, but along with a new FOB are still cheap. It gets expensive when you have to have the grooves cut in your unit, but you can transfer that to the new FOB. Do a Youtube review and go from there.

 

There is no soldering to be done on his FOB. Mine has none. It's likely a bad circuit board, tech2. I have done two of them already on my Malibu. It's one of the things I never wanted on my Chevy. Thankfully, I haven't had to visit a dealership to get them programmed. The car does that with a working FOB.