OBD-II Trouble Codes

P008A Code: Low Pressure Fuel System Pressure – Too Low

Reading Time: 4 minutes

Your vehicle’s on-board diagnostics (OBD) monitors your vehicle’s performance through a network of sensors and alerts you of potential issues.

Trouble codes, such as the P008A, help you understand the nature of a potential problem within your vehicle. Find out what the P008A code means and learn more about its symptoms and possible causes with this brief guide.

What Does the P008A Code Mean?

Diagnostic trouble code (DTC) P008A stands for “Low Pressure Fuel System Pressure- Too Low.” This trouble code sets when the powertrain control module (PCM) has detected that the fuel pressure is too low within the low fuel system. In some cases, low fuel volume or insufficient flow may also trigger this code.

fuel pressure sensor
Code P008A may register when your PCM detects that the fuel pressure is too low within the low fuel system.

Note: The definition of code P008A may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

Often, this code pops up in diesel-powered vehicles. Diesel engines rely heavily on a high-pressure injection pump to provide the high pressure needed to atomize the fuel efficiently. The low-pressure fuel system supplies the high-pressure fuel injection pump with fuel from the fuel tank.

Gas-powered vehicles may also exhibit code P008A. In a typical modern, returnless gasoline fuel system, a control module (usually the fuel pump control module) regulates an in-tank fuel pump to control fuel pressure. A fuel pressure sensor provides the fuel pump control module with feedback regarding system operation. The fuel pump control module communicates with the PCM over a data network.

The PCM monitors the operation of the fuel system closely because a lot of factors may hamper the system’s operations and performance. For example, in a diesel fuel system, additional air introduced into the system by an injection pump or injector may cause several issues. Fuel leaks and contaminated fuel may also affect the fuel pump and other low-pressure fuel system components.

fuel injector
Fuel injector failure is one of the possible causes of P008A code.

What are the Possible Causes of the P008A Code?

There are several possible reasons why a DTC like P008A sets. After all, DTCs indicate the potential location and nature of the issue, not the root cause. Listed below are some of the likely triggers of the P008A code:

What are the Common Symptoms of the P008A Code?

When a trouble code sets, the vehicle’s computer sends a signal to illuminate the check engine light or the malfunction indicator lamp (MIL). For many trouble codes, other symptoms may also be present. However, other trouble codes may not manifest signs other than an activated check engine light. Listed below are some of the common symptoms of the code P008A:

How to Diagnose the P008A Code

Finding out what triggered a DTC to set can be a challenging and time-consuming task. Proper diagnosis requires the vehicle owner or a mechanic to narrow the problem down from a list of possible causes.

With the right tools and information, addressing the main issue behind P008A is possible. Vehicle-specific repair manuals and databases are the best sources of information, as they contain detailed instructions and helpful illustrations. Other sources are also available online, such as how-to videos and informative blog posts.

increased car emissions
Increased emissions can be a sign of P008A code.

How to Fix the P008A Code

Aside from several possible causes, fixing trouble codes is further complicated by the fact that vehicles are made differently, depending on the manufacturer. The solution to P008A on Mercedes-Benz vehicles may not work the same way to address the P008A on Ford vehicles.

Repair manuals and databases may be helpful to the seasoned DIYer. However, if you don’t know how to troubleshoot and fix OBD codes, it’s best to have a professional mechanic or technician do the repairs for you.

Other Notes About P008A

It’s important to keep your fuel system working properly to avoid more problems down the line. Consistently low fuel pressures may cause issues in the future, especially for diesel engines. Once you encounter the P008A code, it is highly recommended that troubleshooting and repairs be done immediately.

Common solutions to the code P008A include replacing the fuel filter or the fuel pump. However, these solutions may not work in all cases. Determining the root cause of the issue is extremely important.

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