Back doors do not lock or unlock with key fob or buttons?I have to unlock by pulling up on the lock manually? This is 08 Pontiac G6 Gt

Bad switches, contacts, fuses/relays.

Go into your settings on the radio and change it to RKE. The alarm will beep when you unlock the doors via your keys but stop once you turn the ignition on, the alarm will not arm unless you lock your doors either.

It's not expensive to program fobs... my dealer will do a reasonable amount (I had 4 of them) for $40 and he states that it would be the same cost for just 1 fob programming

Sounds like the key fob is going bad and needs replaced.

key in ignition 2 number 2 then press the fob. till doors lock. 2 to 3 times then unlock with fob. turn back key lock car. then un lock. then do the same with the other fob.

Often times when you replace the battery in a remote fob you have to sync it to the car by locking and unlocking the drivers door with the key.
Check your owners manual.

Gm and Chevy fob can be programmed at home. I have done it my self for a 01 chevy a 03 sunfire.
The steps on
 Step 1 of 5
Get in your Pontiac G6 and make sure all the doors and the trunk are closed.

 Step 2 of 5
Put your key in the ignition and hold the "Lock" button on the driver's car door.

 Step 3 of 5
Turn the G6 key in your ignition from "On" to "Off" while holding the "Lock" button, and do two more cycles of "On" and "Off" in quick succession.

 Step 4 of 5
Release the "Lock" switch on your door and press and hold the "Lock" button on your keyless remote for 10 to 15 seconds.

 Step 5 of 5
Remove the key from the ignition of your G6, and test the programming.

Or

Or

 Step 1 of 9
Enter your vehicle and close all of the doors behind you besides the driver's door. Be sure to have your keyless remote and ignition key in hand.

 Step 2 of 9
Insert and remove the key from the ignition twice in a row and then close and open the door twice in a row.

 Step 3 of 9
Insert and remove the key from the ignition again and close and open the driver's door two more times.

 Step 4 of 9
Insert the key into the ignition and close the driver's door.

 Step 5 of 9
Cycle the key in the ignition "On" and then "Off" and then remove the key from the ignition.

 Step 6 of 9
Wait for the locks to cycle to indicate the beginning of the programming sequence.

 Step 7 of 9
Press and hold the unlock and lock buttons on your remote for two seconds and then release.

 Step 8 of 9
Press and hold just the
lock button on the remote for three seconds and wait for the locks to cycle to indicate successful programming.

 Step 9 of 9
Repeat steps seven and eight to program any additional remotes and open the driver's door to end the programming sequence once you are finished.
Hope this helps

try pressing the lock and unlock buttons together for 10 seconds and see if this reprograms your fobs

change the battery in the remote.the nearer the car you have to get the lower the battery power.

There is no onboard programming procedure for this vehicle. This vehicle requires special equipment be connected to the vehicle to program the keyless remote. SEE THE DEALER.