[SOLVED] P1187 Code: Fuel Pressure Monitoring – Fixing Regulator Valve Stick!

The automobile fault code P1187 indicates a problem with the fuel system. When this code appears, the engine light or service engine soon warning light will turn on.

The most common causes of this fault code are a faulty fuel pressure regulator (FPR), a faulty rail pressure sensor (RPS), or an issue with the engine control module (ECM). To fix this issue, start by visually inspecting the wiring harness and connectors related to the fuel system.

Look for any damaged components or broken, bent, pushed out, or corroded connector pins. This repair is of moderate importance and difficulty, with an estimated repair time of 1.0. It is crucial to address this issue promptly to prevent further damage to the fuel system.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level6.67 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p1187 fault code.

  • The symptoms of the automobile fault code P1187 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code P1187 can be caused by a faulty Fuel Pressure Regulator (FPR), Rail Pressure Sensor (RPS), or Engine Control Module (ECM).

  • The fault code P1187 can be caused by a faulty Fuel Pressure Regulator (FPR), a faulty Rail Pressure Sensor (RPS), or a malfunctioning Engine Control Module (ECM).

To fix the automobile fault code p1187, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code P1187, start by checking the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors related to the issue.
  • Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors.
  • This fix is estimated to take approximately 1.0 hour.

The factors influencing the diagnosis and fixing cost of automobile fault code P1187 are the estimated repair time of 1.0 hour and the typical auto repair shop charges of $75 to $150 per hour.

The P1187 fault code relates to fuel pressure monitoring in the high-pressure system of an automobile. This monitoring system is designed to detect any issues or fuel leakage.

The Engine Control Module (ECM) plays a crucial role in determining the rail pressure value based on the engine’s operating conditions. It also controls the fuel pressure regulator to ensure that the rail pressure reaches the required level. During engine running, the fuel pressure in the fuel line, including the pumps and injectors, is continuously monitored.

If the rail pressure becomes excessive, the fuel pressure regulator opens, allowing a portion of the fuel to return from the rail to the fuel tank via a collector line. On the other hand, if the rail pressure is too low, the fuel pressure regulator closes.

This regulator is located at the tail end of the high-pressure accumulator. If there is insufficient fuel supply in the fuel line, it can lead to engine symptoms such as shutdown and difficulty in starting.

When the fuel pressure monitoring in the engine fuel pressure line generates a threshold value, the ECM identifies it as a fault and sets the P1187 code. This code specifically indicates a problem with the regulator valve sticking.

What are the possible causes of the automobile fault code P1187?

If you see the engine light or service engine soon warning light on, the fault code P1187 could be the culprit. This code is often caused by a faulty fuel pressure regulator (FPR), a faulty rail pressure sensor (RPS), or an issue with the engine control module (ECM). To fix the problem, start by checking the possible causes mentioned above. Take a close look at the wiring harness and connectors, making sure there are no visible damages. Additionally, inspect the components for any signs of breakage, bending, or corrosion on the connector’s pins.

How can I visually inspect the wiring harness and connectors to fix the P1187 fault code?

To fix the P1187 fault code, start by checking the “Possible Causes” mentioned above. Then, visually inspect the wiring harness and connectors. Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors. This will help identify any issues with the fuel pressure regulator, rail pressure sensor, or engine control module.

What should I look for when checking for damaged components and connector pins to resolve the P1187 fault code?

When resolving the P1187 fault code, start by checking for damaged components and connector pins. This can be done by visually inspecting the related wiring harness and connectors. Look for any signs of damage such as broken, bent, pushed out, or corroded connector pins. By doing this, you can identify any issues that may be causing the fault code and take the necessary steps to fix them.

p1187 error fault code explained

If you see the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty Fuel Pressure Regulator (FPR), Rail Pressure Sensor (RPS), or Engine Control Module (ECM).

To fix it, visually inspect the wiring harness and connectors, check for damaged components, and look for any broken, bent, pushed out, or corroded connector pins.

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