Notably, the extra key fob 5H1 option is available on the Work Truck (WT) and LT trim levels of the Silverado HD and on the Pro trim level of the Sierra HD. It’s currently unclear how many ...

Regardless of how many times you press the button or smack the key fob against the palm of your hand, the doors won't unlock. Of course, all hope is not lost because this usually just means the ...