P1401 code — how to fix error fast

The code P1401 can be a pretty tough one, especially for owners that drive diesel-powered cars. If you received this code via a diagnostic scan, chances are that you’ll be looking for a quick fix. However, before we can get to that, it’s time to help you go through the P1401 code meaning and causes to give you the bigger picture of this code.

So, let’s not waste any time and get straight to fixing this code by going though the main reasons behind it and diagnostic methods to help you narrow down the solutions.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P1401 code mean?

The P1401 code is a diagnostic trouble code (DTC) that is related to the exhaust gas recirculation (EGR) system. It is typically found in vehicles with diesel engines and indicates that there is a problem with the EGR flow control valve.

When the EGR flow control valve fails or malfunctions, it can cause a number of issues with the engine’s performance. One of the most common symptoms of a faulty EGR flow control valve is a reduction in power and acceleration. The engine may also run rough or stall when idling.

What causes the P1401 code?

There are several potential causes of the P1401 code, which can make it difficult to diagnose. Some of the most common causes include:

Faulty EGR valve

The EGR valve can become clogged or damaged over time, which can cause it to malfunction. This can result in the P1401 code being triggered.

Open or short EGR valve circuit

If there is a problem with the wiring or circuitry that controls the EGR valve, it can cause the P1401 code to be triggered.

Faulty EGR pressure sensor

The EGR pressure sensor is responsible for monitoring the pressure in the EGR system. If it malfunctions, it can cause the P1401 code to be triggered.

Vacuum supply issues

The EGR valve relies on a vacuum supply to function properly. If there is a problem with the vacuum supply, it can cause the P1401 code to be triggered.

Which car models does the P1401 code affect the most?

The P1401 code is typically found in vehicles with diesel engines, particularly those manufactured by Ford. Some of the most commonly affected models include:

• Ford F-250 Super Duty: This truck is known to have issues with the faulty EGR pressure sensor which often led to the code P1401 showing up after a diagnostic scan.
• Ford Excursion: This one is yet another Ford vehicle that has issues with the P1401 code due to faulty sensors and short circuits among other electrical issues that the model is reported to have.

How to diagnose the P1401 code

Diagnosing the P1401 code can be tricky, as there are several potential causes. However, there are a few steps you can take to help narrow down the problem:

Check the EGR valve

The first step is to check the EGR valve itself. Look for any signs of damage or wear, and check to make sure it’s working properly. You can do this by using a vacuum pump to apply a vacuum to the valve and checking to see if it opens and closes.

Check the wiring and circuitry

If the EGR valve appears to be working properly, the next step is to check the wiring and circuitry that controls it. Use a multimeter to check for any open or short circuits.

Check the EGR pressure sensor

If the wiring and circuitry appear to be working properly, the next step is to check the EGR pressure sensor. Use a multimeter to check for any open or short circuits.

Check the vacuum supply

Finally, check the vacuum supply to the EGR valve. Make sure there are no leaks or other issues that could be causing the problem.

How to fix the P1401 code

Fixing the P1401 code will depend on the underlying cause of the problem. Here are some of the main ways that the issue can be resolved based on what you’ve found to be the reason behind the code:

Replace the EGR flow control valve

If the EGR valve itself is faulty, it will need to be replaced. This is a relatively simple repair that can be completed by a qualified mechanic.

Clean the EGR passage

If the EGR passage is clogged with carbon buildup, it may need to be cleaned or replaced. This is a more involved repair that may require the removal of the intake manifold.

Repair damaged wiring or circuits

If there are issues with the wiring or circuitry that controls the EGR valve, repairs may be needed to fix any open or short circuits.

Repair or replace the EGR pressure sensor

If the EGR pressure sensor is faulty, it will need to be repaired or replaced. If this sensor fails, the EGR valve won’t do its job properly and that’s why the code P1401 may appear.

How to prevent the P1401 code

Preventing the P1401 code from being triggered in the first place is the best course of action. Here are a few tips to help prevent the code:

• Perform routine maintenance
• Use high-quality fuel
• Drive at highway speeds

Using high-quality fuel can help reduce the buildup of deposits in the EGR system, which can help prevent the P1401 code from being triggered. Also, driving at highway speeds can help keep the engine running at optimal temperature, which can help reduce the risk of the P1401 code being triggered.

Our take

The code P1401 is an OBD2 error code that could lead to quite a few issues with your engine’s performance and increased gas emissions. Thankfully, it’s possible to contain the issue before it grows into a serious engine fault, and our team hopes that this guide will help you do just that.