Truck Forums - Inertia Switch?

New member; first post...
Does the 2011 Sierra (reg cab) have an "inertia switch", and if so, where is it located? I've suddenly developed a "crank..no start" issue. I've determined that this truck has a "fuel pump control module" vise fuse/relay. I've checked for fuel pump: sound at fill pipe (no sound) but found that there is pressure at fuel rail schrader valve. Wanted to check if inertia switch is tripped before going out back to the control module.