P2624
Injector Control Pressure Regulator Circuit Low
Fuel injection (diesel)
Generic OBD-II
High
What it means
P2624 means the ECM saw low voltage in the injector control pressure regulator circuit. On high-pressure-oil diesels this regulator sets the pressure that fires the injectors, so a fault here can cause hard starting, stalling, low power, or a no-start. It's usually a wiring, connector, or regulator problem — worth diagnosing promptly.
High
Can I keep driving? May hard-start, stall, or fail to start — on affected diesels this regulator is needed to fire the injectors.
Common symptoms
What you'll notice
- Check-engine light on with the code stored
- Hard starting, extended cranking, or no-start
- Stalling, especially at idle or under load
- Low power, hesitation, or rough running
Common causes
Most likely first
- Short to ground or open in the pressure regulator (IPR) control circuitLikely
- Corroded or loose connector at the regulatorCommon
- Faulty injection control pressure regulatorCommon
- Low engine oil level or aerated oil on high-pressure-oil (HEUI) systemsLess often
- Faulty ECM control-circuit driverLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and injection control pressure (ICP) live data.
- Check engine oil level and condition on HEUI diesels first.
- Inspect the regulator connector and wiring for shorts, opens, or corrosion.
- Measure the regulator's resistance and command it with a scan tool.
- Replace the regulator if out of spec. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2624?+
Not reliably. This regulator controls the pressure that fires the injectors on affected systems, so you risk stalling or being stranded. Repair it before extended driving.
Can I just clear P2624?+
It returns as soon as the circuit fault recurs. The wiring, connector, or regulator needs repair.
Related codes
Often seen with P2624
Read & clear P2624 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX