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A high pressure fuel line cracked or leaking at a fitting. These lines carry fuel at pressures of well over a thousand bar, so a leak is not a drip — it is an atomised spray, and it is an ignition risk against a hot engine as well as a pressure fault.

The module sees it as a rail that cannot hold its commanded pressure, so the codes name rail pressure or the regulator while the fault is a hole. A pressure that builds and then falls away under demand, with a healthy pump, is a leak — and the confirmation is usually visible as a wet or unusually clean patch where fuel has washed the dirt off a fitting.

High pressure lines are single-use on most systems. The end forms cold-seal against the seat, so a line that has been removed and refitted often will not seal again — which is why this fault appears after injector or pump work rather than at random. Never attempt to seal one by overtightening; the correct repair is a new line, and the ferrule and seat should be inspected while it is off.