P2623 code meaning
Injector Control Pressure Regulator Circuit/Open
Powertrain system Generic code P26xx codes Check engine light
What P2623 means
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.
P2623 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2623
- Engine cranks but does not start
- Stalling or severe power loss
- Malfunction indicator lamp on
Common causes of P2623
- Most likelyOpen IPR valve coil
- Most likelyLoose or corroded IPR connector, broken wire on the high-pressure pump cover
- Less likelyFaulty IPR driver in the PCM
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Icp regulatorWiring harness
What each part of P2623 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 23 | The exact fault in that area. |
What to do next
- Note P2623 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2623
What does P2623 mean?
P2623 means "Injector Control Pressure Regulator Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2623?
Drive gently and only to a workshop. With P2623 the car can go into limp mode (reduced power) to protect itself.
Will P2623 fail an emissions test?
Yes, it can. P2623 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2623 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2623 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.