Does anyone know where to find the shock sensor reset button on a 2001 Blazer?

huh? What is a shock sensor?

I assume you're referring to the fuel pump inertia switch. It is designed to shut off the power to the fuel pump in case of collision. However, a good bump in a parking lot can also trip it. Check just above the passenger side kick panel or consult your owner’s manual. If you still can’t locate it, ask the dealer. It's there somewhere, guaranteed.