Lost your key fob or need to program a new remote for your 2003 GMC Sierra? Programming your key fob for the 2003 GMC Sierra is easier than you might think, and you can accomplish it yourself without a trip to the dealership. This step-by-step guide will provide you with clear instructions to program your 2003 GMC Sierra key fob quickly and efficiently.
Step-by-Step Programming Instructions for Your 2003 GMC Sierra Key Fob
Follow these simple steps to program your 2003 GMC Sierra key fob:
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Begin by ensuring all doors on your 2003 GMC Sierra are completely closed. This is a critical first step to ensure the system is ready to enter programming mode.
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Insert the ignition key into the ignition cylinder of your Sierra. Have your key ready in the ignition to start the programming sequence.
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Press and HOLD the power UNLOCK button on the driver’s side door panel. Maintain pressure on the unlock button; you will need to hold it until step 9.
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Complete steps 5 through 8 in rapid succession. These next ignition key turns need to be performed quickly for the programming to initiate correctly.
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Turn the ignition key to the ON position. Turn the key in the ignition to the point just before you would start the engine.
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Turn the ignition key back to the OFF position.
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Turn the ignition key to the ON position once more. Again, turn to the ‘ON’ position without starting the engine.
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Turn the ignition key back to the OFF position for a final time.
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Release the power UNLOCK button on the driver’s door panel. Upon releasing the button, listen for the vehicle to automatically cycle the door locks, locking and then unlocking. This lock cycling indicates that your 2003 GMC Sierra has successfully entered key fob programming mode. If the locks do not cycle, remove the key, open the driver’s door, and repeat the procedure from step 1.
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Immediately press and HOLD both the LOCK and UNLOCK buttons simultaneously on the key fob you are programming. Keep both buttons pressed until you observe the doors lock and unlock once again. This might require holding the buttons for up to 30 seconds.
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Repeat step 10 for each additional key fob you need to program, including any existing remotes you intend to use with your 2003 GMC Sierra. It’s important to program all key fobs in one programming session.
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Turn the ignition key to the ON position. This action will exit the key fob programming mode on your GMC Sierra.
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Test each programmed key fob to verify that they are all functioning as expected with your 2003 GMC Sierra.
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