<h1>2023 GMC Sierra Smart Key Programming Instructions</h1> <p><font size="3"><b>Important Notice:</b> This model does not support onboard keyless remote programming by the owner. </font></p> <p><font size="3"><b>Programming Instructions:</b> </font></p> <ul> <li><font size="3">Step 1: A trained technician must use an authorized scan tool to access the vehicle’s programming interface.</font></li> <li><font size="3"> Step 2: Insert or scan the new smart fob as prompted by the diagnostic system. </font></li> <li><font size="3">Step 3: Complete the programming cycle and verify each fob's functionality. </font></li> <li><font size="3">Step 4: Confirm programming is complete by testing locking, unlocking, and engine start functions.</font></li> </ul>
