P2623
Injector Control Pressure Regulator Circuit/Open
- Severity
- High
- Driving
- Drive only to a garage
An open circuit in the injector control pressure regulator. This valve sets the high oil pressure that fires the injectors on some diesels; without control of it, injection cannot be managed and the engine will run badly or not at all.
Possible causes
- CommonFailed injector control pressure regulator
- CommonCorroded or oil-contaminated connector
- CommonWiring damage in a hot part of the engine bay
- CommonLow engine oil level or oil of the wrong grade
- PossibleDebris in the oil jamming the regulator
- RareFailed control module driver
What you might notice
- Hard starting or no start
- Rough running and misfire
- Loss of power
- White smoke on start-up
- Check engine light on
What to check, in order
- Check the engine oil level, condition and grade first. These systems fire the injectors using engine oil at very high pressure, so oil faults cause more problems here than wiring does.
- Inspect the connector for oil contamination - a leaking seal fills its own plug.
- Measure the regulator winding resistance against specification.
- Watch commanded against actual injector control pressure on the live data screen.
- Read all codes - pressure codes alongside this one usually mean the pressure is genuinely wrong.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Computer output circuits and control module
P2600P2601P2602P2603P2604P2605P2606P2607P2608P2609P2610P2611P2612P2613P2614P2615P2616P2617P2618P2619P2620P2621P2622P2623P2624P2625P2626P2627P2628P2629P2630P2631P2632P2633P2634P2635P2636P2637P2638P2639P2640P2641P2642P2643P2644P2645P2646P2647P2648P2649P2650P2651P2652P2653P2654P2655P2656P2657P2658P2659P2660P2661P2662P2663P2664P2665P2666P2667P2668P2669P2670P2671