Fault code P2625 is called “Injector Control Pressure (ICP) Regulator Circuit High” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.
Technical description and explained code P2625
This Diagnostic Trouble Code (DTC) is a generic powertrain code. Error P2625 is considered a generic code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly depending on the model.
Saving this code means that a high signal level has been detected in the injector control pressure regulator circuit. On most vehicles, this circuit is normally controlled by the Power Control Module (PCM).
Although this code is used primarily in high pressure diesel fuel injection systems, it can also be used in vehicles with gasoline engines. The PCM controls high-pressure fuel injection using one or more fuel pressure sensors.
The high-pressure injection system of a diesel engine operates on the valve timing and is driven by the main components of the engine timing. Incorrect pressure in the injector control system can indicate a serious malfunction in the engine’s lubrication or timing mechanisms.
The conditions that cause this code to appear can be either mechanical or electrical causes.
The injector control pressure regulator controls the oil pressure coming out of the high pressure oil pump. This pressure is used to control the fuel injectors.
If the oil pressure is too high, the injectors will not work properly, so the PCM monitors the fuel pressure while the engine is running. If the oil pressure regulator sends an invalid signal, or does not send a signal at all, code P2625 will be stored.
Symptoms of vehicle malfunctions
The main signal that an error P2625 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.
It can also be warning signs such as:
- The “Check engine” control lamp on the control panel will light up (the code will be memorized as a fault).
- Other related fault codes may also be present.
- Low oil pressure.
- Excessive amount of smoke coming from the exhaust.
- Abnormal noises coming from the engine compartment.
- The engine may fail to start or stall after starting.
In most cases, the error P2625 is high, because it can lead to serious consequences for the engine. Therefore, it is recommended to eliminate its causes as soon as possible.
Factors that can cause this error code
The error code P2625 can mean that one or more of the following problems have occurred:
- Faulty injector control pressure regulator.
- Faulty high-pressure injection pressure switch.
- Faulty high-pressure oil pump.
- Low engine oil level.
- Low oil pressure.
- Open or short circuit in control circuit.
- Corroded, damaged, or loose connector.
- Weakened or faulty control box ground contact.
- Sometimes faulty PCM is the cause.
How to fix or reset OBD-2 code P2625
Some suggested steps for troubleshooting and fix the error code P2625:
- Connect the OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
- Before continuing with diagnosis code P2625, check the engine oil level.
- If the level is normal, check the oil pressure as well as the high-pressure oil pump.
- Also check the hoses for leaks.
- Inspect and test the associated wiring.
- If necessary, repair or replace any shorted, broken, damaged, or corroded wiring.
- Test injector control pressure regulator and relay.
Diagnose and repair of problems
Before diagnosing error P2625, check that the engine is filled with oil to the proper level and that the oil pressure and oil level lamps on the instrument panel are not illuminated. If not, you may need to manually check the oil pressure.
Oil pressure affects the timing components of the engine. High pressure injection is driven by engine timing components. If the oil pressure in the engine is low, the injection phasing can be adversely affected.
Next, make a visual inspection of the associated wiring harnesses as well as the connectors. Repair or replace wiring that has been cut, burned, or otherwise damaged.
Checking the electrical part
Using a multimeter, check the voltage and ground circuits on the injection system pressure regulator. If no voltage is detected, check the system fuses, replacing the blown ones if necessary.
If voltage is detected, check the corresponding circuit on the PCM connector. If no voltage is detected, there is likely an open circuit between this sensor and the PCM. If voltage is detected on the PCM, the module itself may be defective or there may be a programming error.
Also, when troubleshooting error P2625, the injection pressure regulator itself should be checked with a multimeter. If it does not meet the manufacturer’s specifications, it is defective and must be replaced.
On which vehicles does this problem occur most frequently
Fault code P2625 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:
- Hyundai (Santa Fe)
Fault code P2625 can sometimes be found with other errors. The most common are the following: P2623, P2624.
