Remote start function on remote doesn't work for a 2005 Pontiac G6.

Replace battery first and see if that help, if not then follow steps below, if you cant figure it out or it still doesn't work, or take it to the dealer, it could be remote module is faulty. Keep the windows open as a safety measure, then,

Remove the ignition key from the ignition lock cylinder.

Remove the BCM PRGRM fuse from the fuse panel. Refer to Fuse Block in Wiring Systems.

Close all of the doors.

Close the liftgate.

Turn the ignition lock cylinder to ACC.

Turn the ignition lock cylinder to OFF, & then back to ACC within 1 second.

Open & close any vehicle door. A chime will be heard when the system enters the BCM programming/diagnostic mode.

Important
After 7 seconds, a chime may be heard confirming successful synchronization. It is necessary to wait approximately 14 seconds for a second chime that will confirm successful programming.


Press & hold the transmitter LOCK & UNLOCK buttons simultaneously for 14 seconds.

Repeat the previous step on each additional transmitter to be programmed.

Remove the ignition key from the ignition lock cylinder.

Install the BCM PRGRM fuse back into the fuse panel. Refer to Fuse Block in Wiring Systems.