P0087 - Fuel Rail/System Pressure Too Low

Introduction

The DTC P0087 trouble code indicates that the fuel rail pressure is not as high as the engine management system expects. This problem can affect the performance of the vehicle, causing a variety of symptoms ranging from a slight loss of power to difficulty starting and power delivery. In this article, we will explore in detail the symptoms, causes, diagnosis methods, and troubleshooting and repair procedures associated with this trouble code. The goal is to provide auto mechanics with a practical guide to address and resolve the problem.

Symptoms

When your vehicle has a DTC code P0087, you may observe a number of symptoms, including:

  • Power loss :
    the engine may have difficulty accelerating or may noticeably lose power while driving.

  • Difficulty starting :
    the engine may have trouble starting, requiring more attempts than normal.

  • Warning lights on :
    It is likely that warning lights will come on on the dashboard, such as the "Check Engine" or other engine management related lights.

  • Increased fuel consumption :
    Due to an irregular fuel delivery, consumption may increase significantly.

  • Engine vibrations :
    the engine may vibrate abnormally due to poor fuel atomization.

Cause

Causes of the P0087 code can vary and include:

  • Low fuel pressure :
    This is the main cause and can be caused by a faulty fuel pump.

  • Clogged fuel filters :
    A clogged fuel filter can prevent adequate fuel flow to the engine.

  • Sensor problems :
    A bad or faulty fuel pressure sensor can send incorrect readings to the ECU, causing the error light to illuminate.

  • Damaged pipes :
    Damaged fuel lines or leaks can compromise pressure.

  • Electrical problems :
    Damaged electrical circuits or loose connections can affect the operation of the fuel pump.

  • Defective bank :
    In the case of direct injection engines, a faulty cylinder bank could cause uneven fuel distribution.

Diagnosis

Diagnosing the P0087 code requires a systematic approach and the use of appropriate diagnostic tools. The steps to follow include:

  1. Error Code Analysis :
    Use an OBD-II scanner to check for other related DTC codes, such as P0088 (Fuel Line Pressure Too High) or P0191 (Fuel Pressure Sensor).

  2. Visual inspection :
    Perform a visual inspection of all fuel lines, pump, and filters for signs of damage or leaks.

  3. Fuel Pressure Test :
    use a pressure gauge to measure the fuel pressure in the line. Compare the measured value with the manufacturer's specifications.

  4. Checking the pressure sensor :
    Check the operation of the fuel pressure sensor using a multimeter to check continuity and readings.

  5. Fuel pump check :
    Test the fuel pump to make sure it is working properly and providing the necessary pressure.

Resolution and repair

Once you have identified the cause of the P0087 code, you can proceed with the repair. Here are some common steps:

  • Replacing the fuel pump :
    If the pump is defective, it is necessary to replace it with a new one.

  • Replacing the fuel filter :
    A clogged filter must be replaced to restore adequate fuel flow.

  • Pipeline repair :
    Any damaged lines must be repaired or replaced to eliminate fuel leaks.

  • Replacing the fuel pressure sensor :
    If the sensor is faulty, it must be replaced to ensure accurate readings.

  • Checking the electrical connections :
    make sure all electrical connections are solid and free of corrosion.

  • ECU Reset :
    After carrying out repairs, it is advisable to reset the engine control unit to clear the error code and monitor the operation of the vehicle.

Insight into the components involved

Critical Power System Components

To better understand the P0087 code and its implications, it is helpful to examine the key components involved in the fuel system:

  • Fuel pump :
    responsible for sending fuel from the tank to the engine. Electric pumps can fail due to wear, overheating, or fuel contamination.

  • Fuel filter :
    removes impurities from fuel. A clogged filter can reduce fuel flow and affect pressure.

  • Fuel pressure sensor :
    monitors the pressure in the fuel line and sends information to the ECU. If it does not work properly, it can cause incorrect readings and the error light to come on.

  • Pressure rectifier :
    In some vehicles, there is a pressure regulator that keeps the fuel pressure within specific limits. If the regulator is faulty, it can cause pressure fluctuations.

Conclusions

The DTC P0087 trouble code represents a serious problem in a vehicle's fuel system, directly impacting engine performance and reliability. Identifying and resolving the underlying causes requires careful analysis and the use of appropriate diagnostic tools. Through a methodical approach and thorough understanding of the components involved, auto repairers can successfully address this trouble code, ensuring a proper repair and a return to full vehicle functionality.

Important
Not all OBD2 codes used by one manufacturer are used by other brands, and may not have the same meaning.
The information presented here is for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any concerns about repairing your vehicle, please contact your repair shop.