Technical Description of OBD-II Trouble Code
The control circuit for Fuel Pressure Regulator 2 is experiencing low voltage.
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code that applies to OBD-II equipped vehicles (Isuzu, Mazda, Dodge, Chrysler, Ford, GMC, Chevy, Toyota, Honda, etc.). While it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
When a code P2295 is stored, it indicates that the powertrain control module (PCM) has detected a low voltage signal from the control circuit of the electronic fuel pressure regulator designated 2. The numeral designation 1 is used in systems that have multiple electronic fuel pressure regulators. It may refer to a particular engine bank, but not always.
Typically, the PCM controls the electronic fuel pressure regulator. Battery voltage and ground signals are used to control a servo motor that positions the regulator valve to achieve the desired level of fuel pressure for any given situation. The fuel pressure sensor is located in the fuel injector rail and allows the PCM to monitor fuel pressure so that it can adjust fuel pressure regulator voltage as necessary. Increasing voltage at the electronic fuel pressure regulator servo motor opens the valve and increases fuel pressure. Decreasing voltage causes the servo to retract and decreases fuel pressure.
Most often, the fuel pressure regulator and fuel pressure sensor are integrated into a single housing (with one electrical connector), but they may be separate components.
If the actual fuel pressure regulator control circuit voltage is lower than the desired level calculated by the PCM, a P2295 code will be stored and a malfunction indicator lamp (MIL) may illuminate.
Related fuel pressure regulator engine codes:
Symptoms & Severity
Since excessive fuel pressure can lead to various drivability issues and cause damage to the internal engine and catalytic converter, a code P2295 should be considered severe.
Symptoms of a P2295 code may include:
Causes
Potential causes for this code to be set are:
Diagnostic and Repair Procedures
To diagnose a code P2295, you will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), a suitable fuel pressure gauge, and a reliable vehicle information source (such as All Data DIY).
NOTE: Extreme caution must be exercised when using a fuel pressure gauge. High pressure fuel contacting hot surfaces or open spark could ignite and cause a fire.
Start by visually inspecting the system wiring and connectors, focusing on harnesses and connectors on top of the engine. Pests in cold climates often gnaw system wiring and connectors in the warm upper engine area.
Connect the scanner to the vehicle diagnostic port and retrieve stored codes and freeze frame data. Write down this information as it will be helpful during the diagnostic process. Clear the codes and, if possible, test-drive the vehicle.
If the code is immediately reset, check for the correct voltage and a battery ground at the fuel pressure regulator. If voltage is not present, test power supply relays and fuses following the wiring diagram from the vehicle information source. If there is no ground, use the wiring diagram to locate the fuel pressure regulator control system ground/s and ensure they are secure.
If there is voltage and ground at the fuel pressure control regulator, obtain fuel pressure specifications from the vehicle information source and test fuel system pressure using the fuel pressure gauge. Always follow the manufacturer’s recommendations for using the fuel pressure gauge. Use the scanner to observe fuel system data while visually monitoring manual fuel pressure with the fuel gauge.
If the level of fuel pressure reflected on the scanner does not match the actual fuel pressure, suspect a faulty fuel pressure sensor. Variations in fuel pressure regulator control voltage should correspond to fluctuations in actual fuel pressure. If this does not occur, suspect that either the fuel pressure regulator is defective, there is an open or shorted circuit in one of the fuel pressure regulator control circuits, or the PCM is faulty.
Use the DVOM and follow the manufacturer’s recommendations for testing the electronic fuel pressure regulator and the individual fuel pressure regulator control circuits. Disconnect controllers from the circuit before testing circuit resistance and continuity with the DVOM to prevent damage to control modules.
Additional diagnostic notes:
