P2623
Injector Control Pressure Regulator Circuit / Open
The Injector Control Pressure (ICP) regulator on hydraulically actuated injectors (HEUI diesel) or the high-pressure regulator on common-rail systems cannot be driven. Injection pressure cannot be controlled, engine may not start.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Open coil in the pressure regulatorCommon
- Broken control wirePossible
Parts involved
- Icp Regulator
- Wiring Harness
P2623 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.