Maintaining a vehicle’s fuel system is important for optimal engine performance and efficiency. Among different diagnostic codes, the P0087 code is one of the most significant, especially for Duramax engines. This code denotes low fuel pressure within the rail or system, which may lead to potential engine problems.
In this blog, we’ll discuss the P0087 code Duramax, its symptoms, causes, and possible solutions to help you address the issues and maintain your vehicle’s health. Let’s dive in!
What is the P0087 Code?
The P0087 code is “Fuel Rail/System Pressure Too Low.” It indicates low fuel pressure in the fuel rail or system, which may impact engine performance. This code is important for vehicles with Duramax engines, such as P0087 code Duramax LBZ or P0087 code Duramax LB7. Some common causes of the P0087 code include a defective fuel pressure sensor, a blocked fuel filter, or leaking fuel lines.
What are the Common Symptoms of the P0087 Code?
When the fuel pressure decreases, it results in a decline in the engine’s performance. If you are facing P0087 Duramax no start issues, the below symptoms might be the cause.
- Potential stalling of the engine
- Poor engine performance can lead to misfires from rough operation and diminished power during high RPMs or acceleration.
- A decrease in fuel efficiency since the vehicle may need more fuel than required.
- The vehicle’s engine may idle unevenly.
These symptoms of the P0087 code must be addressed quickly to ensure safe and reliable vehicle operation.
10 Possible Causes of the P0087 Code & Their Possible Solutions
Now, let’s discuss the potential causes of the P0087 code and their solutions that can help to get rid of the problems.
1. Fuel filter issues: A blocked fuel filter restricts fuel flow, leading to insufficient pressure in the fuel rail. For P0087 Duramax cold weather, a clogged filter can create problems. The best solution to overcome this is to replace the fuel filter regularly.
2. Crimp or obstruction in the fuel supply line: Any kind of physical damage or blockage in the fuel supply line can disrupt fuel flow, leading to low-pressure readings. Therefore, inspecting and repairing kinks is important to ensure proper fuel delivery.
3. Bad or failing fuel pump: At times, both low-pressure and high-pressure fuel pumps can fail, resulting in inadequate fuel delivery to the engine. To prevent this, test the pump’s output pressure and replace it if necessary to resolve P0087 code no-start problems.
4. Electrical issues due to low-pressure fuel pump: Wrong wiring or bad connections to the low-pressure fuel pump can become an obstacle to the appropriate functioning of the engine. In such cases, it is important to check and repair electrical connection to prevent major problems.
5. Electrical defects in the fuel rail pressure sensor: A malfunctioning sensor may provide inaccurate readings of fuel pressure, triggering a P0087 code even if actual pressure is adequate. Here, replacing a faulty sensor can solve the problem.
6. Electrical problem with high-pressure pump solenoid: When the solenoid controlling the high-pressure pump fails, it doesn’t activate properly, negatively impacting fuel pressure. To prevent this, test the solenoid and replace it if you find it defective.
7. Broken or worn high pressure pump: Wear and tear on the high-pressure pump can lead to decreased performance and insufficient pressure in the fuel rail. Therefore, it is necessary to inspect the pump and replace it in a timely to avoid significant breakdowns.
8. Camshaft timing or camshaft lobe wear on the pump drive: If the camshaft timing is off or if there is wear on the cam lobe that drives the high-pressure pump, it may not operate effectively due to low pressure. Adjust timing or replace the worn components to fix this problem.
9. Leaking fuel pressure regulator: A faulty regulator can cause the fuel to leak out, preventing it from maintaining proper pressure within the system. It is important to inspect and replace a leaking regulator to ensure the fuel pressure remains at the correct level.
10. Clogged fuel injectors: If fuel injectors become clogged, they can block the flow of fuel into the engine, resulting in low rail pressure. Clean or replace the clogged injectors to ensure proper performance and resolve P0087 error codes.
Here’s a video that’ll help you understand the causes of P0087 easily.
Diagnosis Mechanism Of P0087 Code
Diagnosing P0087 code Duramax involves identifying the underlying issue and then finding a solution to fix the problem. Here are the steps you must follow:
- Check for the trouble codes with the help of OBD-II scanner. This helps you identify and confirm if there are any P0087 codes.
- Check the fuel lines for damage, crimps, or obstructions. If there are any problems, fix them to ensure smooth fuel delivery.
- Next you need to test the fuel pressure regulator using a fuel pressure gauge. If the readings are below the recommended levels, check the regulator for leaks and repair it if needed.
- Check the fuel pump. A weak or failed fuel pump doesn’t work properly as it doesn’t provide the needed pressure for smooth functioning of the engine.
By following the above steps, you can run a diagnostic check of the fuel pump and resolve issues if any. Check this video to know more.
Conclusion
Understanding the P0087 code and its implications is important for maintaining engine optimal performance. If left unaddressed, this error code may lead to major engine problems. Be aware of the symptoms and take measures to diagnose and resolve the underlying problems. When you encounter the P0087 code, consult qualified mechanics who can diagnose the engine and recommend appropriate solutions.
