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I used my scanner to operate the rear liftgate and it works fine but not with the keyfob.
 

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This worked on my ‘08 Acadia. Try resetting the controller by doing this.... Turn ignition to run, but don’t start the engine. When everything has powered on and chime stops, Hold down the lift button on the remote for at least 30” or until you either hear a beep, or the lift gate moves.
 
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