P2625: Injector Control Pressure Regulator Circuit High

With P2625 the module sees the injection pressure regulator circuit at too high a level: the switched line is shorted to battery voltage, or the IPR coil draws more current than the driver allows. No manufacturer documents this code publicly; Ford's 6.0 L Power Stroke summaries from 2003 to 2009 fold every IPR driver fault into P2623, and International's HEUI truck engines report through their own codes. The regulator matters because it alone decides how much oil pressure reaches the injectors; Navistar's HEUI design lets that pressure be set independently of engine speed. If the PCM cannot pull the IPR coil, rail pressure stays near minimum, so the engine may not start at all. CARB treats such hydraulic pressure control as part of fuel system monitoring.

Medium severity. Can I keep driving?Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

Symptoms

Long cranking or no-start
Low power, engine may stall
Malfunction indicator lamp on

Most likely causes

IPR control line shorted to a battery-voltage circuit
IPR coil with reduced resistance causing overcurrent
Faulty IPR driver in the PCM

What to check, in order

Start with the simplest. You can tick off each step.

Check the connector and wiring of the injector indicated
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Measure the resistance and compare it with the manufacturer's specification
Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
On diesels, check the per-cylinder injection corrections

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P2625 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
6: Control modules and outputs
25: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2625?

Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

What causes code P2625?

The most common causes are: iPR control line shorted to a battery-voltage circuit; iPR coil with reduced resistance causing overcurrent; faulty IPR driver in the PCM.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.