I just had to have battery replaced in 08 cobalt, now keyless entry will not work, had batteries replaced in both fobs, neither is working. Cant arm the alarm at all, have to manual unlock doors, and suggestions>?

SOURCE: remote keyless entry not working

KEY FOBS FOR THIS MODEL MUST BE PROGRAMED USING A TECH 2 SCAN TOOL SO IT MUST BE DONE AT THE DEALERSHIP FOR ABOUT HALF HOUR LABOR HOPE THIS HELPS

Jerry Koski

• 443 Answers
• Posted on Apr 27, 2009

SOURCE: 2004 Chevy Impala Keyless Entry System Stopped Working

HOPE THIS HELPS YOU MIGHT WANT TO REPROGRAM THAT KEYLESS ENTRY FOB.. JERRY
. Turn the ignition to ACC or ON and the radio to off. Do not crank the engine.

2. Press and hold the DISP button on the radio for at least five seconds until settings is displayed.
3. Press the SEEK up or down arrows until FOB PROG appears on the display.

4. Press the PREV or NEXT button to enter the submenu. The current selection will have an
asterisk next to it. BEGIN will be displayed.

5. Press the DISP button to start programming. When the message PUSH FOB flashes, press and
hold the LOCK and UNLOCK buttons on the first transmitter at the same time for 15 seconds. A
chime will be heard to verify the transmitter is learned.

6. Repeat Step 5 for each additional transmitter up to four remotes total. You do not need to press
the DISP button again, just press down the LOCK and UNLOCK buttons on the next transmitter
to be learned to a maximum of four transmitters per vehicle.

The mode you selected is now set. You can either exit the programming mode by following the instructions later in this section or program the next feature available on your vehicle.

EXIT (Exit Feature Customization Mode): This feature allows you to exit the vehicle customization programming.
To Exit:
1. Scroll until EXIT appears on the display.
2. Press the DISP button to exit programming. A chime will he heard to verify the exit.

SOURCE: keyless entry remote

Check inside the remote case...there's instructions printed that tell you to hold the lock and unlock buttons for 7 seconds to reset the remote. I'm in the middle of replacing batteries myself. Let me know if it works.

SOURCE: VW Jetta keyless entry remote not working

newer remotes just pull apart, no screws

first detached the half with the pivoting key
just pull that half away from the other half

on the half without the key attach
it splits apart to expose the battery (usually a 2032 watch battery)
you may need a small flat head screw driver to help to split it apart

SOURCE: Keyless entry stopped working on

Lock all the doors from the inside (with all the doors closed), unlock your driver's door by manually lifting the lock, then press it back down after you are out - this will prevent the alarm from sounding when you use the key to unlock the door.