Injector Control Pressure Regulator Circuit High
What it means
P2625 means the PCM saw a high (out-of-range) voltage on the injection control pressure regulator circuit. On hydraulically actuated (HEUI) diesels this regulator sets the high-pressure oil that fires the injectors, so a fault here can cause hard starting, low power, rough running, or a no-start. The problem is usually electrical — wiring or the regulator valve — but low or contaminated engine oil can also upset injection pressure.
Can I keep driving? Limited — on these diesels the injection-control-pressure regulator is essential for firing the injectors, so expect hard starting, low power, or a no-start; get it fixed before relying on the vehicle.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting or a no-start
- Low power / limp mode
- Rough running or stalling
- Poor fuel economy
Common causes
Most likely first
- Short-to-voltage or open in the injection control pressure (IPR) regulator circuitLikely
- Faulty IPR / injection control pressure regulator valveCommon
- Corroded or loose connector at the regulatorCommon
- Low or contaminated engine oil (these HEUI systems use oil to fire the injectors)Less often
- Faulty PCM / injector driverLess often
How to diagnose & fix
Work through it in order
- Scan and view the injection control pressure (ICP) and IPR duty-cycle data while cranking.
- Inspect the IPR connector and wiring for a short-to-power or an open circuit.
- Check engine oil level and condition — low or dirty oil upsets injection pressure.
- Test the IPR valve's resistance and commanded response.
- Replace the IPR valve if faulty; consider the PCM only after wiring and oil are verified good.
FAQ
Quick answers
Is it safe to drive with P2625?+
Can I just clear P2625?+
Related codes
Often seen with P2625
Read & clear P2625 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.