The 7.3 Powerstroke engine is a popular diesel engine used in many Ford vehicles. If you own a Ford truck with this engine, you might come across the Diagnostic Trouble Code (DTC) P1247 on your infotainment cluster. What does it mean, and how can you fix it?
The P1247 code on the 7.3 Powerstroke engine indicates low turbocharger boost pressure in the engine. This is caused by the air intake system between the turbocharger and the intake manifold leaking, the variable geometry turbocharger (VGT) being slow to respond, or the VGT vanes being stuck open.
In this article, I’ll take you through everything you need to know about the P1247 code on the 7.3 Powerstroke engine and potential solutions for fixing this issue. Let’s get started!
5 Steps to Fix the P1247 Code on 7.3 Powerstroke
First, it’s essential to understand the role of the Fuel Injection Control Module (FICM) in the 7.3 Powerstroke engine. It manages the fuel injection system on the engine and determines the fuel needed for different power outputs.
It uses input from various sensors to determine the appropriate amount of fuel to inject into the engine’s cylinders at any given time.
When the FICM detects a problem with the fuel injection system, it will trigger a diagnostic trouble code (DTC), such as the P1247 code, in the instrument cluster to notify the driver of a problem.
The P1247 code indicates that the FICM has detected an issue with the fuel pressure on the engine. This could be caused by several factors, which I discuss below.
1. Check the Fuel Injector and Fix It If It Is Faulty
The fuel injectors on the 7.3 Powerstroke engine are responsible for delivering the right amount of fuel to the engine’s cylinders for the desired power output.
If one or more of these injectors do not work as required, the engine might self-diagnose and trigger the P1247 code.
A fuel injector may be getting stuck when you open it, experiencing coking of the injection valves, or having other problems. You’ll have to diagnose and fix it.
The filter may be functional but clogged. The fuel filter on the 7.3 Powerstroke engine is responsible for removing any contaminants from the fuel before it enters the engine.
If this filter gets clogged, possibly from dirty fuel, it can restrict the flow of fuel to the engine and trigger the P1247 code.
Inspect the fuel filter and make sure it’s not clogged. This involves removing and visually inspecting it for signs of contamination or obstruction. If it’s clogged, you need to clean or replace it. Do the same for the fuel lines.
Once the fuel filter and fuel lines have been checked and any necessary repairs have been made, clear the P1247 code from the engine’s computer and do a road test to ensure the issue has been resolved.
2. Troubleshoot the Fuel and High-Pressure Oil Pumps
The high-pressure oil pump on the 7.3 Powerstroke engine provides the necessary pressure to operate the fuel injectors.
The pressure from the pumps pushes out the fuel from the injectors in the required proportions to facilitate power production by the engine.
If this pump fails, it can cause the fuel injectors to malfunction and trigger the P1247 code.
Check the pump’s pressure output and compare it to the manufacturer’s specifications. If the pump is not producing enough pressure, it might need to be replaced.
The fuel pump transfers fuel to the engine, and if it fails or isn’t functioning correctly, it can cause the engine to run lean and trigger the P1247 code. You may also need to check the fuel injectors and ensure they function properly. Replace any faulty injectors you find.
The sensor of the Powerstroke engine is responsible for monitoring the pressure in the fuel injection system and its failure can also trigger the P1247 code.
Once the high-pressure oil pump and fuel injectors have been replaced and are functioning properly, clear the P1247 code from the engine’s computer and perform a road test to ensure the issue has been resolved.
3. Replace or Repair the MAP Hose if It Is Damaged
The MAP hose is a small rubber pipe that connects the engine’s intake manifold system to the MAP sensor.
The sensor is responsible for monitoring the pressure in the intake manifold, which is used to determine the amount of air entering the engine to mix with fuel for power production.
If the MAP hose is damaged or disconnected, it can cause a vacuum leak in the intake manifold.
This can cause the engine to run lean, which means that fuel delivered to the engine’s cylinders is insufficient, which can cause the engine to run poorly or even stall and trigger the P1247 code.
You’ll need to inspect the MAP hose for any damage or leaks. If the hose is damaged, replace it. You may also need to check the MAP sensor and ensure it is in good condition.
4. Ensure the Turbocharger Is Working Properly
The turbocharger in the engine is responsible for forcing additional air into the engine’s cylinders, which allows the engine to produce more power.
It does so by directing the exhaust gasses from the engine to spin a turbine, which in turn drives a compressor that forces air into the engine.
If the turbocharger is not producing enough boost, it can cause a shortage in the fuel delivered to the engine’s cylinders, which can trigger the P1247 code.
To diagnose and fix this issue, you’ll need to inspect the turbocharger and ensure it is functioning properly.
This entails checking the condition of the bearings, shaft, and seals, as well as the compressor and turbine blades of the turbocharger. If any of these components are damaged or worn, replace them.
5. Faulty Powertrain Control Module (PCM)
The PCM is responsible for controlling the engine’s fuel delivery system. If it’s not functioning properly, it can cause the engine to run lean, which can trigger the P1247 code.
Fixing a PCM problem usually involves using a diagnostic tool to read the code stored in the PCM and determine if there are any problems with the module.
Apart from information from a diagnostic tool, the following can help you know you have a faulty PCM:
- Your vehicle has problems starting.
- Erratic vehicle transmission.
- Your engine is stuttering or stalling.
- Loss of gas mileage.
- The ‘check engine’ light is on.
If the PCM is faulty, you’ll need to replace it.
Next, check the engine’s sensors and ensure they work well. The PCM relies on input from these sensors to determine the correct fuel delivery to the engine, so if any of them aren’t working properly, they’ll need to be replaced.
Unless you have a mechanical background, it’s a good idea to let a mechanic replace the PCM for you as this is not one of those minor things you can handle yourself. You’ll have to pay them, but it’s safer for your vehicle.
How Much Will It Cost To Fix the Problem?
The cost of fixing the P127 error code depends on the underlying issue, the extent of the damage, and the labor costs charged by the mechanic.
In general, however, repairs for the P1247 code on the 7.3 Powerstroke engine range from a few hundred dollars to over a thousand dollars.
This may include the cost of acquiring new parts such as a new fuel filter, fuel injectors, high-pressure oil pump, or PCM, as well as labor costs for diagnosing and repairing the issue.
It is always best to consult your mechanic or repair shop to get a more accurate estimate of how much it will cost to fix the P1247 code on the 7.3 Powerstroke engine. They’ll provide a detailed diagnosis of the issue and give you a more precise estimate of the cost of repairs.
What To Do if the P1247 Code Persists?
If the error code persists even after following the steps explained above, it may be necessary to seek the assistance of a professional mechanic or repair shop. Engines are complex, and repairing them on your own can be challenging.
To avoid more issues, it is recommended to call in a professional at the first sign of the error code to resolve it as soon as possible.
To wrap it up, the code P1247 indicates a problem with the pressure in your 7.3 Powerstroke engine.
To fix the problem, it is recommended to first check the electrical connections and fuel pump, then the fuel injectors and fuel injector control module if necessary.
If you don’t have the expertise, you’re better off seeking the assistance of a professional mechanic or repair shop to diagnose and repair the problem.
Overall, understanding the meaning of the P1247 code and knowing how to troubleshoot it can help prevent potential future problems and keep your vehicle running smoothly.
Other common error codes on the 7.3 Powerstroke and how to fix them: