P2004 is a somewhat rare diagnostic trouble (DTC) code. It indicates that your Ford Ecosport's intake manifold runner control (IMRC) is stuck open. The IMRC system is a relatively new technology, which means three things:
P2004 is a general code, which means that it has the same meaning for the Ford Ecosport as it would any other vehicle. There are three parts to the definition P2004. Understanding each of them will help you diagnose your Ecosport and clear the code a lot faster. The throttle body allows air into the intake manifold. Once the air makes its way through the intake, the IMRC fine-tunes the airflow for each particular intake runner. This action creates a swirling effect that allows for more efficient combustion. The IMRC is controlled by your Ecosport’s powertrain control module (PCM). It can use either the engine’s vacuum or an electronic motor to operate the system (depending on model year and engine type). However, the vacuum-operated version does seem to be more prevalent. The IMRC is stuck open and can no longer fine-tune the air. This may cause some unwanted effects (covered below), particularly at lower RPM levels. Each cylinder head is considered to be a “Bank.” Bank 1 is the cylinder head with the first cylinder. You don’t need to worry about this at all if your Ecosport has an inline engine, as there is only one bank of cylinders. On bank 1, the code is P2004. With bank 2, the code would be P2005. You will usually notice symptoms when your Ecosport has P2004. Usually, it’ll feel like a misfire or a rough running engine. Here are the most common ones:
Here are the most common causes of P2004. Before doing anything, check for codes related to the MAF and MAP sensors. If one of these sensors is bad, it can cause issues with the IMRC and throw P2004. The wiring harness going to the IMRC and the pigtail that connects to it can cause P2004. Check your Ecosport’s wiring harness around the IMRC to ensure that it hasn’t been rubbed against anything or burnt. If it has, you’re going to need to replace or repair the wiring harness. Make sure that the harness has the proper voltage (or voltage going to it at all). Verify that the ground is good. Most IMRC systems are vacuum controlled. Check the vacuum lines going to/from it for a leak. If there is a leak, you’ll need to replace the lines. If the lines look worn out, brittle, or dry rotted, that could be the problem right there. You can use a vacuum pump to verify that the IMRC can still operate the butterflies. With your Ecosport’s IMRC disconnected, you can operate the linkage that it controls by hand. It shouldn’t give any resistance in its movement. If it does, then it’s binding in the intake. This can happen for a few reasons: On a vacuum-operated IMRC, you can control the butterfly valves with a vacuum pump (like a Mityvac). If they open and close with no resistance, you can rule out any issue with the intake, which either leaves the IMRC actuator or something causing it not to command open or closed. Replacing the IMRC actuator is the most common fix for P2004. In the previous step, you checked all of the wiring going to it and ensured that it was good. So, at this point, it’s likely to be the IMRC causing P2004 in your Ecosport. If your Ford Ecosport has P2004, it will often run noticeably rougher, but it shouldn’t break down. Still, you should fix the problem. Leaving it alone for too long can cause other issues.
P2004 Definition: IMRC Control – Stuck Open (Bank 1)
IMRC Control
Stuck Open
Bank 1
P2004 Symptoms: Ford Ecosport
Ford Ecosport P2004 Causes + Diagnosis
1. IMRC Wiring (Likely)
2. Vacuum Leak (Vacuum Operated IMRC Only)
3. Intake Manifold and Linkage (Somewhat Likely)
4. Bad IMRC (Very Likely)
Conclusion