Check the driver-door body-frame ground and the fuel pump control module wiring. On this truck, voltage dropped on the red/violet power wire between the FPPM fuse and the rear module; the damaged section was in the square tube where the loom turns under the frame beneath the driver-side fuse panel. Repair that wiring rather than replacing the module if power is present at the fuse but not at the module.
The owner of a 2016 Chevrolet Silverado had no communication from the fuel pump control module. Power was present at the fuse box, but the red/violet wire at the module had only about 1.4 volts and no obvious break. The expert suggested checking the ground at the driver's door body-frame mount and reviewing the module wiring diagrams. Further testing found a voltage drop to about 2 volts on the red/violet wire between the FPPM fuse and a midpoint toward the rear module. A jumper around the damaged section allowed the truck to start, and the break was located in the square tube where the loom turns under the frame beneath the driver-side fuse panel. Later posts described similar no-start and power-loss symptoms, but no additional confirmed repair was established.
