Reset the inertia/rollover switch, check the fuel pump fuses and relays, and reseat the fuel pump module and computer connectors after grounding yourself. Inspect the wiring for obvious faults. Module testing is typically dealer-specific, so avoid replacing the expensive module without further diagnosis.
The owner of a 2000 Ford Ranger 4x4 reported OBD-II messages saying the fuel pump driver module was disabled or offline and the fuel pump control was out of self-test range, listing codes 1234 and 12345. The expert said these appear to be Ford-specific monitoring codes related to fuel pressure and a separate module, and recommended checking the inertia switch, fuses, relays, connectors, and wiring before considering module replacement.
