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P0253 is a diagnostic trouble code (DTC) for "Injection Pump Fuel Metering Control "A" Low (Cam/Rotor/Injector)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
This trouble code identifies an Injection Pump Fuel Metering Control “A” Low (Cam/Rotor/Injector) problem.
This code only ever gets stored on the PCMs (Powertrain Control Module) of diesel engines. It means that the vehicle’s PCM has detected an inconsistency between the electronic fuel control actuator’s signal voltage that was sent out and the one returned by the fuel metering sensor control.
All diesel injection systems rely on some type of an electronic fuel control actuator which is responsible for measuring the amount of fuel that is allowed into the actual pumping chamber of a high pressure diesel fuel pump. Therefore, this device determines how much fuel is going to be delivered to the fuel rail and by how much pressure.
This pressure needs to be controlled, though, and the acceptable range is very narrow. The vehicle’s PCM is constantly checking in on this process through a variable resistance sensor. If the vehicle’s PCM notes that the reading is inaccurate due to an inconsistency between signals, this code gets stored.
There are a few common reasons behind the P0253 code getting stored:
The fuel filter has become clogged or dirty
The fuel pump is defective
The fuel control actuator driver inside the PCM is actually faulty
This last possibility is pretty rare.
Sometimes, there will be only minor symptoms associated with this problem. The Check Engine Light may come on, for example, but nothing more. Other times, though, more noticeable symptoms may appear, such as:
A mechanic will need to do the following to diagnose the problems associated with the P0253 code:
Far too often, a mechanic sees this code and immediately goes to work replacing the injector pump or injectors. However, more often than not, it’s the fuel filter that is the problem. After that, the most common problem is usually the wiring and/or connectors.
The most serious concern attached to the P0253 code – or any trouble code reported from a diesel-engine vehicle – is that an amateur will try fixing the problem on their own. These engines work under extremely high pressures and can be extremely dangerous, especially if the amateur is trying to work on a fuel pump.
Outside of that, this is still a problem that should get fixed right away before it turns into something worse. Anytime the engine is struggling, there’s a risk that a bigger problem is brewing.
Otherwise, the mechanic probably doesn’t have to do much more than examine the connectors and circuits coming from the fuel control actuator and connecting to the PCM. Chances are they’re frayed, damaged or shorted and just need to be repaired or replaced.
When working on a diesel engine’s fuel system, it’s essential that the mechanic observe safety guidelines, especially if they intend to release any of its residual pressure before proceeding with repairs.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.