FOB Problem
Thread Starter
4th Gear
Joined: May 2006
Posts: 4
Likes: 0
FOB Problem
Recently my FOB would'nt work, so I replaced the battery; reprogrammed it & worked for a day. Unlocked the car using the key, then reprogrammed again. FOB working, then in a day or so, it no longer functions. Reprogram again... get the picture. Now i'm reprogramming daily or hourly, and it'll work for a short while then fails to fucntion.
Any ideas?
Any ideas?
Veteran
Joined: Jan 2000
Posts: 2,082
Likes: 1
From: Louisville KY
Originally Posted by 2000_Convert
Recently my FOB would'nt work, so I replaced the battery; reprogrammed it & worked for a day. Unlocked the car using the key, then reprogrammed again. FOB working, then in a day or so, it no longer functions. Reprogram again... get the picture. Now i'm reprogramming daily or hourly, and it'll work for a short while then fails to fucntion.
Any ideas?
Any ideas?
If you have a second remote try that one, if not, a new one usually solves the problem 99.9% of the time.
Welcome to the Forum and the Twilight Zone of the keyless remotes!
Instructor
Joined: Sep 2005
Posts: 170
Likes: 1
From: Newcastle OK
Thanks, and thanks. Know of any reliable sources to purchase other than GM dealers?
HTH
Brent
Drifting
Joined: Oct 1999
Posts: 1,712
Likes: 7
From: Sunnyvale CA
The FOBs have weak battery contacts. When you bump it, it loses battery contact momentarily. This forces a re-sync. Open the FOB and gently pry up the battery contacts so they put more pressure on the battery. Bet it works. 
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Here is something that you can try before you dump your old fob that may "still be good"!!
The main 12 VDC battery, if low/weak will start a C5 but play havoc on certain modules! Check your DTC Codes and see what codes are there. If you see tons of history codes, clear them all!! Reprogram the FOB's and when they fail again, recheck the codes. If you see a lot of U series codes, you battery may be too weak to maintain the memory functions in the BCM, IPC. When you start the car, the available battery voltage drops low. If it drops below 9 VDC, your modules will NOT be happy and shut down for a very brief period of time erasing the volatile memory's.
You can have your battery checked out at any of the local automotive stores, and sears. Make sure that they test the reserve cranking voltage capacity of the battery.
Please let me know if this helps you.
Bill C
The main 12 VDC battery, if low/weak will start a C5 but play havoc on certain modules! Check your DTC Codes and see what codes are there. If you see tons of history codes, clear them all!! Reprogram the FOB's and when they fail again, recheck the codes. If you see a lot of U series codes, you battery may be too weak to maintain the memory functions in the BCM, IPC. When you start the car, the available battery voltage drops low. If it drops below 9 VDC, your modules will NOT be happy and shut down for a very brief period of time erasing the volatile memory's.
You can have your battery checked out at any of the local automotive stores, and sears. Make sure that they test the reserve cranking voltage capacity of the battery.
Please let me know if this helps you.
Bill C
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Melting Slicks
Joined: Aug 2004
Posts: 2,237
Likes: 9
From: Springhill FL
I had that same problem with an FOB I bought. Though mine would usually last a few days. Somewhere along the line it decided to work though, because I havent had to reprogram it for several months now.
Of course, now that I've said something....It will quit tonight
Of course, now that I've said something....It will quit tonight
Racer
Joined: Jul 2001
Posts: 455
Likes: 2
From: manahawkin,nj
Originally Posted by DAWS C5
The FOBs have weak battery contacts. When you bump it, it loses battery contact momentarily. This forces a re-sync. Open the FOB and gently pry up the battery contacts so they put more pressure on the battery. Bet it works.
He has it right thats how I fixed mine.
Jerry