P2625: Injector Control Pressure Regulator Circuit High
What to do
Expect a no-start, or an engine that starts and runs badly.
One thing to ask about specifically: whether there is oil inside the connector. This regulator sits on the high-pressure oil pump, and oil wicking along the wires into the plug is a common cause here — it insulates the terminals and looks exactly like a broken wire. If oil is found, cleaning the connector alone is not enough, because the oil will keep arriving; the wiring behind it needs attention too.
As at P2623: this engine injects using high-pressure oil rather than fuel pressure, so a no-start here is not a fuel system problem however much it looks like one.
What this code means
The injector control pressure regulator circuit reads above its valid range — an open circuit, a disconnected connector, or a short to supply. The system is described at P2623.
The regulator sits on the high-pressure oil pump, in a hot and oily part of the engine, and its connector lives there too. Oil creeping into a connector along the wires is a real failure mode rather than a theoretical one — it wicks along the strands from a seal that has aged, insulates the terminals and eventually produces an open circuit that looks electrical and is not.
That has a practical implication worth acting on: if oil is found in the connector, the wiring back from it needs checking too, because the oil has come from somewhere and will keep coming. Cleaning the plug alone puts the fault back a few months.
Likely causes
Start here
- Open circuit in control wiring · moderate
- Oil ingress into connector · moderate
- Disconnected sensor connector · easy
- Faulty injection pressure regulator · moderate
Less common
- Wiring shorted to voltage · moderate
Symptoms
Components involved
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.
Community experience
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