Technical Description of OBD-II Trouble Code
The pressure in the low-pressure fuel system is too low.
What does that mean?
This generic powertrain diagnostic trouble code (DTC) typically applies to all OBD-II vehicles. This includes vehicles from Hyundai, Ford, Mazda, Dodge, and others.
Low fuel pressure systems are commonly used in diesel systems. The injection pump is responsible for providing diesel engines with the high fuel pressures they need to atomize the fuel effectively.
However, the injection pump still requires fuel to be supplied to it. This is where low fuel pressure pumps/systems come into play. It is crucial for the ECM (Engine Control Module) to closely monitor these conditions. This is because any air introduced by a starved injection pump/injector under load can cause significant issues. Forced limited power is usually a mode that the vehicle enters to control certain values and prevent further damage to the engine. Fuel also has to pass through various filters, pumps, injectors, lines, and connections before being delivered to the engine, so there are many possibilities for issues. Even small fuel leaks often produce a noticeable smell.
While monitoring numerous other systems and sensors, the ECM has detected a low fuel pressure condition and/or insufficient flow. It is important to be aware of local fuel conditions, as repetitive fill-ups with dirty fuel can contaminate not only the fuel tank but also the fuel pump and other components.
The P008A Low Pressure Fuel System Pressure – Too Low code is set when the ECM detects low pressure within the low fuel pressure system.
What is the severity of this DTC?
As mentioned earlier, low fuel pressures can cause issues in the future for diesel engines. The severity of this code would be considered moderate-high because if you plan to drive your diesel vehicle daily, you need to ensure that your fuel system is functioning properly.
What are some of the symptoms of the code?
Symptoms of a P008A diagnostic code may include:
What are some of the common causes of the code?
Causes for this code may include:
What are some P008A troubleshooting steps?
Basic Step #1
If there are any leaks, address them immediately. Leaks can cause lower than desired fuel pressures in a closed system, so ensure that the system is properly sealed and not actively leaking. Rusted lines, fuel filter gaskets, deteriorated o-rings, and other components can all cause fuel leaks.
Basic Tip #2
Check the fuel filter in your low fuel pressure system. It may be located on the frame rail or close to the fuel tank. If the fuel filter appears to have never been changed or has not been changed in a while, replace it accordingly. Introducing air into a diesel fuel system can be a challenging problem to fix, so make sure to follow proper bleeding and filter replacement procedures. Refer to the service manual for specifications and procedures.
Basic Step #3
If possible, locate the fuel injector. It is usually easy to find, but there may be plastic covers and other brackets obstructing proper visual inspection. Ensure that no fittings or connectors are leaking fuel. Also, check for any signs of physical damage or anything that could restrict fuel flow, such as a kinked line at the injector. Particles in the fuel are a real possibility due to the small openings. Maintain the fuel system properly (e.g., fuel filters, EVAP, etc.).
