P2623Injector Control Pressure Regulator Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Engines with hydraulically actuated unit injectors (HEUI) fire their injectors with engine oil pressurised by a high-pressure pump; the injection pressure regulator (IPR) valve sets that oil rail pressure. P2623 says the PCM cannot drive the IPR because its circuit is open. Ford's OBD summaries for the 6.0 L Power Stroke from 2003 to 2009 call this the IPR actuator monitor: it runs continuously every 8 ms with engine off or running, needs less than a second and fails when the driver status shows an open or short. Ford's 2014 PCM code list marks P2623 as a MIL code. Without IPR control the oil rail cannot reach the pressure the injectors need, so expect a no-start or stalling. P2624/P2625 are the low and high faults; ICP sensor faults are P2284-P2288.
- What you may notice
- Engine cranks but does not start
- Stalling or severe power loss
- Malfunction indicator lamp on
- Likely causes
- LikelyOpen IPR valve coil
- LikelyLoose or corroded IPR connector, broken wire on the high-pressure pump cover
- RareFaulty IPR driver in the PCM
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.