Programming Instructions for 2012 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. Quickly turn the ignition ON, OFF, ON, OFF. (ON is the position just before of starting your vehicle, OFF is the position whereyou can pull your key out of the ignition)
5. Release the power unlock button on the driver's side door panel. The vehicle should respond by locking and unlocking automatically. If locks cycle then continue to step 6.(if the door locks begin to lock and unlock BEFORE releasing the unlock buttonthen the vehicle has not entered programming mode and you must start over. Remove key, open door and return to step 1. If thevehicle continues to lock and unlock before releasing the unlock button then there is a problem with the vehicles system and remotesmust be programmed by a certified professional. If you are unable to get the door locks to cycle then you are turning the key tooquick, too slow, there's a problem with the vehicles system, or the vehicle is not equipped with a factory keyless entry system.
6. Hold the LOCK and UNLOCK buttons on the remote at the same time until door locks cycle again. This could take up to 30seconds.
7. NOW repeat step 6. for all additional remotes including working ones.
8. After step 6. has been performed for all remotes TURN ignition to ON to exit programming mode.
9. Turn ignition OFF, remove key and test all remotes to make sure that they are all properly programmed.
Key Programming Information for 2012 GMC Sierra 2500 HD
1. Insert the original, already programmed key in the ignition and start the engine.2. After the engine has started, turn the key to off and remove the key.
3. Insert the key to be programmed and turn it to on within 10 seconds of removing the original key.
4. The security light will turn off once the key has been programmed. It may not be apparent if the security lightwent on due to how quickly the key is programmed. If your vehicle does not have a security light (04-07 GrandPrix, Bonneville, Impala) wait 10 minutes and 45 seconds to make sure the key has been programmed.
5. Repeat steps 1 through 5 if additional keys are to be programmed.
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