Powertrain, generic (extended)

P2623 Injector Control Pressure Regulator Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Open IPR valve coil
Loose or corroded IPR connector, broken wire on the high-pressure pump cover
Faulty IPR driver in the PCM

Symptoms

  • Engine cranks but does not start
  • Stalling or severe power loss
  • Malfunction indicator lamp on

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

icp regulatorwiring harness

Related codes

P2624P2625P2284P2285P2286P2288

References: fordservicecontent.com, fordservicecontent.com, performanceparts.ford.com, en.wikipedia.org.