P2624: Injector Control Pressure Regulator Circuit Low
What to do
Expect either a no-start or an engine running roughly and noisily, depending which way the valve has failed.
Worth acting on promptly. The high-pressure oil pump that feeds this valve is an expensive part, and running it against a regulator that cannot be controlled loads it unnecessarily. The fault itself is usually a wiring one — the connector and the harness to the regulator — so it is not typically a large repair provided it is not left.
As at P2623: this is an oil-side fault on an engine where oil does the injecting, so do not let a diagnosis drift into the fuel system.
What this code means
The injector control pressure regulator circuit reads below its valid range — a short to ground, or a driver output that has failed closed. The system it belongs to is described at P2623.
Which way this presents depends on the valve's arrangement, and both directions are consequential on this engine. A regulator held fully open sends the oil pump's full output to the injectors, so injection control pressure runs high — which is P2288's condition, and it makes for a harsh, noisy engine and stresses the high-pressure oil circuit. Held closed, there is no pressure and the engine will not start.
Either way the pump is working against a valve it cannot control, and the high-pressure oil pump is not a cheap part. That is what makes this worth prompt attention rather than a wait-and-see, even though the fault is electrical.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty injection pressure regulator · moderate
- Damaged wiring harness · moderate
Less common
- Corroded or loose connector · easy
Rare
- Faulty engine control module · specialist
Symptoms
Components involved
Information, not instruction
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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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