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The fuse feeding a fuel pressure or volume regulator, blown so the regulator receives no power at all. The module commands it, sees no response, and reports the regulator — which is in perfect condition behind a dead supply.

A blown fuse is a symptom and replacing it without asking why is the mistake. These fuses do not fail with age; they fail because the regulator's winding has shorted, the harness has chafed to earth, or the driver stage has failed short. A replacement fuse that blows immediately confirms a short, and one that lasts is worth watching rather than trusting.

Measure the regulator's winding resistance before fitting a new fuse. A reading well below specification is a shorted coil and is the cause. Check what else shares the fuse while you are there: many of these circuits feed several components, so an apparently unrelated fault elsewhere on the same fuse is the better clue to which one is dragging it down.