Programming Instructions for 2004 GMC Sierra 2500 HD Remote Fob
You must have all GM remotes including working ones when performing this procedure.(This procedure essentially wipes allremotes from the vehicles memory so all must be reprogrammed***Press each button on the remote 26 times (lock x 26, unlock x 26, horn x26) then attempt the steps outlined below***
1. Close all doors on the vehicle.
2. Then insert key into the ignition.
3. Press and hold the power UNLOCK button on driver's side door panel. Do not release until instructed to do so in step 5.
4.
Key Programming Information for 2004 GMC Sierra 2500 HD
Do-It-Yourself programming procedure is not available for this vehicle. This vehicle requires a diagnostic equipment to be connected to the vehicle to program the key. You will need to find a local automotive locksmith or a dealer to program this key.Use our Locksmith Search if you need professional help.