Some Ford-F150 with 3.5 liters GTDI engines possibly show a MIL illuminated with diagnostic trouble code (DTC) P012d. This specific code refers to poor engine performance issues.
The DTC code P012d Ford F150 means Downstream of throttle valve. In other words Supercharger/Turbo Inlet Pressure Sensor Circuit high. When PCM detects a TCIP sensor signal reading crossing the designer’s limit, it sets the P012d code on Ford-F150. Which indicates that the car is not performing as it should.
Diagnostic Trouble Code made it straightforward for mechanics or users to figure out the problem as soon as possible. You can drive a few weeks or months with a broken MAF sensor. We will explain throughout the entire article so you can learn more about this trouble code and its solutions.
What Does Code P012d Mean on Ford F150?
The code P012d is displayed when the Ford-F150 truck’s powertrain control module (PCM) understands that the signal from the TCIP sensor is crossing its limitation.
Intake manifold pressure is raised by turbochargers and superchargers. This pulls air into the combustion chamber to boost the engine power to accelerate it.
Both chargers have an inlet where the filtered gas gets in. When the sensor detects too high pressure, the P012d code exhibits on the Ford-F150.
The breakdown of the code P012d is given below:
- P = Powertrain (mainly the engine and gearbox). The key accelerates the vehicle forward.
- 0 = Intake Valve Control Solenoid Circuit Low
- 1 = Fuel Rail/ System Pressure – Too High
- 2D = Specific fault index [in our case Supercharger/Turbo Inlet Pressure Sensor Circuit high]
Common Symptoms Of A P012d Ford F150 Issue
When your Ford F-150 shows the trouble code P012d, you will be assured that the car has a problem inside.
But even before that, you will notice some symptoms of the vehicle not working correctly, which will help you understand the problem. Here are some of the common symptoms:
Engine Light Comes on (Limp mode)
Limp mode is built for the driver’s safety which alerts the driver about any problem occurring to their Ford F-150.
Usually, limp mode turns on when the performance and power of the truck drastically go down.
The ECU limits the engine’s max speed and ignition, which results in lower engine power.
The limp mode may also let the TCU control the transmission and be a hitch when you change your gear. The limp mode may restrict the valve timing of your Ford F-150.
Engine Noise and Engine Misfiring
Ford F-150 engine misfires for a few reasons. Sometimes it is due to a lack of airflow. You will smell fuel from the exhaust, indicating the Engine is misfiring.
You will notice some issues with your car and conclude that your car is faulty and making misfiring noise. Firstly the engine light starts to flash, and the engine performs very poorly.
Engine Performance Issues (Poor Performance)
When there is a dirt mass in the airflow sensor, it will get dirty and stop working. So when you try to accelerate the car forward, it will be “laggish” or “sluggish.”
That means the car won’t move forward smoothly; it will jitter in the middle—the most significant symptom of the car hesitating to move forward.
Car not Starting / Stalling
A Ford F-150 can face sudden stalling or starting problems for three most common reasons. There are fuel system failures, air intake systems, and failures in the ignition system.
If your Ford F-150 is not starting or having a rough idle, then it is most likely there is a vacuum leak. You will also hear a hissing sound from the engine bay.
Poor fuel Mileage / Increased Fuel Consumption
The Ford F-150 has a usual mileage of 17 Miles in the city and 23 Miles on the highway.
Dirt in the oxygen sensor, fuel injectors, or spark plugs can be the reason for this problem.
But when you have poor fuel mileage, you will notice a significant drop in the travel distance.
What Are Some Potential Causes Of A P012d Ford F150 Code
There can be some potential reasons for this code to appear in your Ford F-150. Most of them are internal issues.
These possible causes make your car low productive and noisy and force you to spend extra bucks.
Let’s look at some of the causes of P012d:
- Defective Turbo or Supercharger inlet pressure sensor
- Broken wiring harness
- Wiring and connector problems
- A problem within the general electrical system(Fuse)
- ECM or PCM malfunctioning
- Clogged or damaged air filter
How To Diagnose And Fix P012d Ford F150 Code
You are diagnosing engine trouble, and identifying the problem that triggered the code may or may not be straightforward.
For example, some oxygen sensor malfunctioning codes share similar causes and symptoms. If you have no idea what to do, then going to an auto repair shop is your best option.
Or, if you think you are patient enough to learn slowly following proper instructions, you can diagnose the code P012d by yourself. So read the steps below and try.
Replace the Supercharger Inlet Pressure Sensor
Firstly you will need a newsletter in pdf, which will help you locate the sensor’s position.
The solution is to replace the sensor and connector with updated parts. The sensor part number is CV2Z-9F479-A.
You will need some tools like (same tools for all the fixes):
- OBD code reader, multimeter
- Basic Set of sockets, ratchets, and screwdrivers
- Terminal Cleaner
Let the engine cool, and wear rubber gloves for safety. The sensor circuit is behind the throttle valve section.
Check the pins if they are damaged. Buy a new sensor and replace it following the manual. The sensor will cost you around $45.
Check and Fix the Wiring
This is a solution to two of the causes in the article. You will need the same tools as the first solution. Now, find the TCIP and trace the wires. Look for any damage or cut wires.
Check the cables that are connected to the battery. The battery terminals can be damaged. Replace them or polish them with a wire brush and reconnect the wires.
If you see any significant damage on the wire, replace it immediately and if it is not major, then bind it with an anti-shock tape or rubber.
It will work as a cover. The price of wires and wire harnesses varies on the part you need.
Note: Wire harness replacement can look complex to some people, so don’t mess with it. Instead, taking it to an expert is the best thing to do.
Check the fuse and Replace it if necessary.
You need to locate the fuse panel first. It is on the right bottom of the passenger seat’s leg rest area.
Open the board, and you will see two push clips. To open the fuse box, you need to push those clips. Then find which fuse is damaged using the manual, which has a map.
Use a puller clip to pull out the fuse from its socket. It comes with a fuse box. Buy a new fuse with the same model on it. Then replace it and close the panel. That’s it. You are good to go.
The fuse price can start from $8 up to $89, depending on the fuse you need.
Electrical testing of the circuit ( ECM / PCM )
The ECM or PCM can send the wrong signal to the truck. Check the ECM / PCM circuits’ electrical bypass.
If you see it’s not working correctly, buy a new pre-programmed ECM from a well-reputed company, as the dealership will cost a lot of money.
Open the front hood. Disconnect the battery first and open four 10mm screws. Remove the power lines. Make sure the ECM part is the same model. Now install the new part and reconnect the battery.
A new pre-programmed ECM/ PCM will cost around $125, and making a new key will cost $12. The key is necessary, or the car won’t start.
Replace Clogged Air Filter
Open the front hood and locate the air filter. Use a manual to identify it faster. Then unscrew the bolts and lift an air vent.
You will see the filter there. Take it out and dispose of it. Make sure the air filter chamber is clean and clear.
Get a new air filter online or at your local store. Put it back in the same position and close the chamber. Now your Ford F-150’s air filter is replaced and good to go.
The air filter can cost from $8 to $16. But it is available, and you can also find it in your local area for much lower.
How To Prevent A P012d Ford F150 Issue From Happening In The Future
The prevention methods for DTC P012d on Ford F-150 are very simple and can help prevent this.
It happens primarily because of the carelessness of the driver, and some don’t even follow the basic guidelines given in the manual.
Let’s look at some prevention methods for DTC P012d (Ford F-150):
- Trucks are used for carrying heavy stuff, but there’s a carry limit. Do not cross 3,325 lbs.
- Inspect the Air filter often and try to keep the air vent clean.
- Melted battery terminals can cause many issues. Check it regularly and, if possible, spray a heavy metal coat on it.
- Fix minor wire issues before it gets worse.
- Take the truck to a mechanic once a month to check the internals.
- Do not use old ECM or PCM, as they can do more damage.
Ford F-150 is convenient for some people looking for a pickup truck to do their heavy work. However, the combination of a Sedan and SUV makes it more expensive. Besides, the parts get more expensive with the more pricey lineup. So the components get costly too.
So what can you do so you don’t face the DTC P012d issue again on your Ford F-150? The answer is straight. Read the guidelines and learn more about them. You don’t have to know about your car in one day.
Learn one thing a day and try to implement them. Going to an auto repair shop is always an expensive choice. So, before going there, try to fix the problems yourself if you want to save some cash.