What Causes a P0087 Code & How To Fix This Issue

Are you troubled by a P0087 code on your vehicle’s OBD-II system? Getting a P0087 code means your car might not run smoothly. It could lead to issues like engine hesitation, stalling, or trouble starting. Ignoring it could cause bigger problems down the road, so it’s essential to address it sooner rather than later. Let’s explore the reasons behind this common diagnostic trouble code and how you can address it effectively. So keep on reading…

What is a P0087 Code?

The P0087 code indicates a fuel rail/system pressure too low. This means that the fuel pressure in the fuel system is lower than the manufacturer’s specified range. Driving with a P0087 code is not recommended, as it can lead to engine stalling or other performance issues.

Common Symptoms

Engine misfires: Due to insufficient fuel pressure, the engine may misfire or run roughly.
Lack of power: A decrease in engine power or acceleration may be noticeable.
Stalling: The engine may stall, especially when under load or idle.
Check Engine Light: The illuminated check engine light is often the first indication of a problem.

Causes of a P0087 Code

Low Fuel Pressure:

Fuel pressure refers to the force with which fuel is supplied to the engine. It needs to be within a specific range for the engine to operate efficiently.

When the fuel pressure drops below the optimal level, it affects the engine’s performance. It might lead to issues like misfiring, stalling, or difficulty in starting the engine.

Low fuel pressure triggers the P0087 trouble code because it indicates a problem with maintaining the required pressure for proper engine operation.

Fuel Pump Issues:

The fuel pump is responsible for delivering fuel from the tank to the engine. It operates by creating pressure to push fuel through the fuel lines.

If the fuel pump fails or becomes weak, it can’t maintain adequate pressure. As a result, the engine might not receive enough fuel, leading to performance issues and triggering the P0087 code.

Common reasons for fuel pump issues include wear and tear over time, clogs from debris in the fuel tank, or electrical problems affecting the pump’s operation.

Fuel Filter Blockage:

The fuel filter’s role is to remove impurities and contaminants from the fuel before it reaches the engine. Over time, the filter can become clogged with dirt, debris, or sediment from the fuel tank.

A clogged fuel filter restricts the flow of fuel to the engine, reducing fuel pressure. This drop in pressure can trigger the P0087 code as it indicates a problem with delivering sufficient fuel to the engine for combustion.

Faulty Fuel Pressure Regulator:

The fuel pressure regulator controls the amount of fuel that enters the engine’s fuel rail. It adjusts the pressure based on engine load and other factors to maintain optimal performance.

If the fuel pressure regulator malfunctions or gets stuck, it can’t regulate the fuel pressure effectively. This can lead to either too much or too little fuel being delivered to the engine, resulting in performance issues and triggering the P0087 code.

Problems with the fuel pressure regulator can stem from internal wear, contamination, or electrical issues affecting its operation.

Leaks in the Fuel System:

Fuel system leaks can occur anywhere along the fuel lines, connections, or components such as injectors or the fuel tank.

Even small leaks can lead to a drop in fuel pressure over time as fuel escapes from the system. This loss of pressure can trigger the P0087 code, indicating a problem with maintaining the required fuel pressure for engine operation.

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Diagnostic Steps to find out a P0087 Code

Using a Scan Tool:

Scan for codes, paying close attention to the specific code retrieved, such as the P0087 code indicating a fuel system pressure issue.
Analyze freeze frame data provided by the scan tool, which offers a snapshot of vehicle parameters at the time the fault occurred. This data can help identify potential triggers or contributing factors to the problem.
Check for any pending codes that may not have triggered the check engine light yet but could indicate developing issues.

Checking Fuel Pressure:

Locate the vehicle’s fuel pressure test port, typically found on the fuel rail or fuel line. Refer to the vehicle’s service manual or consult with a mechanic if unsure.
Attach a fuel pressure gauge to the test port securely, ensuring there are no leaks or loose connections.
With the ignition key in the “ON” position (engine off), prime the fuel system to build pressure. This step varies depending on the vehicle but often involves cycling the key or activating a priming function through the scan tool.
Once the system is pressurized, observe the fuel pressure reading on the gauge. Compare it to the manufacturer’s specifications for the vehicle. A pressure lower than specified could indicate a problem within the fuel system contributing to the P0087 code.
Perform additional tests, such as a key-on engine-off (KOEO) test and key-on engine running (KOER) test, to assess fuel pressure stability under different operating conditions.

Inspecting Fuel System Components:

Begin by visually inspecting all visible components of the fuel system, including fuel lines, hoses, and connections, for signs of damage, leaks, or deterioration.
Check the fuel filter for clogs or restrictions that could impede fuel flow. If the filter appears dirty or hasn’t been replaced within the recommended interval, consider replacing it.
Inspect the fuel pump and its electrical connections for any signs of wear, damage, or corrosion. Test the fuel pump’s functionality, listening for its operation during key cycles or using a fuel pressure test tool.
Examine the fuel pressure regulator for proper operation and signs of malfunction, such as leaks or erratic pressure control. If necessary, test the regulator’s functionality using a vacuum gauge or other diagnostic methods.

By following these diagnostic steps, mechanics can systematically identify and address issues within the fuel system contributing to the P0087 trouble code, restoring proper engine performance and functionality.

Fixing the P0087 Code:

Replacing the Fuel Pump: If the fuel pump is faulty, replace it with a new one. Ensure that the replacement pump meets the manufacturer’s specifications for your vehicle.

Cleaning or Replacing the Fuel Filter: Clean or replace the fuel filter to remove any dirt or debris that may be causing a restriction in fuel flow. A clean filter ensures proper fuel pressure and prevents future issues.

Repairing or Replacing Fuel Lines: Repair any leaks in the fuel lines or replace damaged sections. Ensure that the fuel lines are properly connected and sealed to prevent fuel leaks.

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Conclusion

A P0087 code can indicate various issues within the fuel system, including low fuel pressure, a faulty fuel pump, a clogged fuel filter, or leaking fuel lines. By understanding the causes and following the diagnostic steps outlined above, you can effectively diagnose and address this issue, ensuring optimal performance and efficiency of your vehicle.