P0251 Code: Injection Pump Fuel Metering Control “A” (Cam/Rotor/Injector)

The fuel injection system is controlled by the powertrain control module (PCM) which controls the operation of fuel injectors and other components based on information from various sensors.

P0251 is one of the several trouble codes related to a fault in this system. Know more about it through this article.

What Does the P0251 Code Mean?

Diagnostic trouble code (DTC) P0251 stands for “Injection Pump Fuel Metering Control “A” (CAM/Rotor/Injector).” This code typically applies to vehicles with diesel engines.

The injection pump fuel metering control circuit “A” is usually located inside or on the side of the injection pump. It’s usually equipped with a fuel rail pressure (FRP) sensor and a fuel control actuator (FCA).

The FRP sensor monitors the amount of fuel delivered to the engine by the fuel FCA to the high-pressure pump and sends this data to the PCM using voltage signals. The PCM then uses this data to analyze the amount of fuel it’ll inject into the engine based on engine operating conditions.

Code P0251 is set once the PCM detects an input signal that doesn’t match normal engine operating conditions. This “normal” condition is based on what’s set in the PCM’s memory.

Note: The definition of code P0251 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0251 Code?

• Failed fuel control actuator
• FRP sensor circuit issues (short/open/grounded)
• Malfunctioning FRP sensor
• Faulty fuel pump
• An issue with the PCM, such as software in need of an update

What are the Common Symptoms of the P0251 Code?

• Illuminated check engine light
• Decreased fuel economy
• Engine performance problems, such as a lack of power and stalling

How to Diagnose the P0251 Code

While DTC P0251 is a generic powertrain code, the steps for diagnosing this code will vary across different makes and models. If you don’t have the tools and technical know-how to diagnose the problem, it might be best to have a professional identify the problem for you instead. If you’re an experienced automotive DIYer, then you can go ahead and do it yourself.

How to Fix the P0251 Code

Trying to fix any trouble code can be tricky, especially if you don’t have the right tools and technical knowledge. We recommend bringing your vehicle to the nearest auto repair shop and having a certified mechanic fix the issue.

But if you have the tools and experience for it, make sure to have the right tools before starting. Guides like those from Chilton can help you fix the issue correctly. An ALLDATA subscription containing vehicle-specific repair information will also be of great help.

Get a Long-Lasting Fuel Rail Pressure Sensor

Is the fuel rail pressure sensor responsible for the P0251 code set by the PCM? Investing in a reliable replacement sensor can prevent recurrences of the trouble code and save you on future repair costs. Fortunately, CarParts.com can help you find a dependable fuel rail pressure sensor quickly and easily.

CarParts.com is your one-stop shop for high-grade replacement parts for various makes and models. We only source our products from trustworthy manufacturers, ensuring the new parts perform as promised throughout their service life. Quickly find the right part by plugging your vehicle’s details into our website’s built-in vehicle selector. You can browse our extensive catalog of products for the new sensor that meets your application and budget. You can expect your new fuel rail pressure sensor to reach your doorstep in only several business days if you live in the continental US and order before noon ET.

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