Cause
Fractured or leaking fuel line
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.
Typically a moderate job.
Some of these codes mean you should stop driving
2 of the 2 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (2)
Codes where this is a likely explanation first, rather than merely a possible one.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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