P2285 – Injector control pressure sensor – circuit low

Reinier

By Reinier (Contact Me)
Last Updated 2021-12-08
Automobile Repair Shop Owner

CodeFault LocationProbable Cause
P2285 Injector control pressure sensor - circuit low
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Wiring short to ground, injector control pressure sensor

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What Does Code P2285 Mean?

OBD II fault code P2285 is a generic code that is defined as, “Injector Control Pressure Sensor – Circuit Low”, and is set when the PCM (Powertrain Control Module) detects an abnormally low input voltage in the circuits that are associated with the Injector Control Pressure Sensor.

NOTE:  Note that this code is relatively common on all large-displacement Powerstroke and Duramax common rail diesel engines.

Since large displacement common rail diesel engines require extremely high injection pressures (20 000+ psi), it is very difficult to control the injectors in such a way that proper fuel atomization occurs under all operating conditions. While simple electronically controlled solenoids can provide adequate control on smaller engines, these methods do not provide the required level of control on large engines.

Therefore, the injectors on large displacement diesel engines are controlled by highly pressurized lubricating oil that forces the injectors open. We need not delve into the complexities of this system here, beyond saying that the system uses a dedicated engine-driven oil pump that delivers highly pressurized oil to an oil rail in each bank of cylinders, from where the pressurized oil is delivered to each injector via dedicated oil galleries.

However, since the injectors are controlled by pressurized oil, the PCM uses varying amounts of oil at different pressures to increase or decrease the injectors’ pulse widths to ensure that the engine is supplied with sufficient fuel to operate at peak efficiency under all operating conditions. Therefore, the PCM obtains input data from a dedicated sensor known as the Injector Control Pressure Sensor to monitor the pressure in the oil rails.

As a practical matter, this sensor contains a pressure-sensitive element whose electrical resistance changes in direct response to changes in pressure. Thus, the PCM interprets the changes in the electrical signal as changes in oil pressure, meaning that the signal from the injector control pressure sensor serves as a feedback signal that the PCM converts into an injector pulse width value.

Put differently, this means that when the PCM needs to increase the injectors’ pulse width to meet an increased demand for fuel, it will increase the pressure in the oil rail to keep the fuel injectors open for longer, while adjusting the fuel injection timing, at the same time.

In practice, the injector control pressure sensor plays a critical role in the PCM’s fuel delivery strategy. Therefore, when a fault, failure, or malfunction occurs that affects the operation of the injector control pressure sensor, or the quality of its feedback signal, the PCM will recognize that it cannot control the fuel delivery system effectively, and it will set a trouble code and illuminate a warning light as a result.

Where is the P2285 sensor located?

This image shows the appearance and location of the injector control pressure sensor on a 2002 Ford F250 application with a 7.3L Powerstroke engine.

However, it should be noted that in all cases, this sensor is challenging to access, and in some cases, it may be necessary to remove or disassemble major engine components to access the sensor. Therefore, we strongly recommend that you seek professional assistance with the diagnosis and replacement of the sensor.

What are the common causes of code P2285?

The most common causes of code P2285 are largely the same across all applications, and could include one or more of the following-

  • Failed, defective, or malfunctioning injector control pressure sensor (Most common)
  • Damaged, burnt, shorted, corroded, or disconnected wiring and/or electrical connectors
  • Failed or failing PCM, but note that this is an exceedingly rare event

What are the symptoms of code P2285?

The most common symptoms of code P2285 could include one or more of the following-

  • Stored trouble code and possibly an illuminated warning light
  • Oil leaks that appear to emanate from the turbocharger; in many cases, the sensor is located just below the turbocharger, so when the sensor fails and starts to leak oil, it might appear as if the turbocharger is leaking oil
  • A no-start condition may be present
  • The engine may be difficult to start when it is hot
  • The engine may misfire on all cylinders at some engine speeds and/or engine loads
  • The idling quality may be poor, or the idling speed may fluctuate wildly
  • The engine may hesitate and surge by turns
  • Varying degrees of power loss may be present
  • Fuel consumption may increase
  • The engine may stall repeatedly or unexpectedly at some engine speeds

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