Thanks for using Just Answer, my name is Doug.
The EGR valve is relatively easy to access on your truck. However, before you replace it I would recomend finding out what the code is for sure. While the EGR code was what came on last time and it can cause poor fuel economy, I would hate to help you replace a part that was not the cause of your problem you're facing now.
Some models allow you to access trouble codes by turning the key on, off, on, off, on (leave on now) and the code will be displayed in place of the mileage. If you have a moment to verify this works on your model, I can help you with the replacement and suggestions that you've asked for.
Great, yes it does help.
P1404 is defined as an EGR valve position sensor malfunction.
The possible causes for this are the EGR valve, wiring or the computer. While there are other codes that relate to an EGR valve which would indicate a flow issue (cleaning passages like you were hoping to do help with flow issues), the code you have appears to be electrical in nature and not related to flow.
Both flow and electrical failures of the EGR valve will result in a Check Engine Light (CEL) as well as poor performance/poor fuel economy.
Were you looking to do any trouble shooting with this? For your answer and follow up support I can provide technical assistance.
If you simply would like to know how to replace the valve and where it is then I can provide that information instead.
Please let me know how you'd like to proceed.
OK, do you have a multimeter? And if so, what is the model number and how familiar are you with it? If you don't have one, would you be willing to go buy one? They are usually less than $30.00.
The EGR valve is located on the front of the engine, just behind the altenator on the "right" cylinder head. Right is as seen from sitting in the driver's seat. There should be a tube going to it held on by 2x 8mm bolts and the valve itself is usually held on by 2x 10mm bolts. According to the factory service manual, you can remove it without taking anything else off. I've yet to replace an EGR valve on a hemi motor yet (I've been at an independent shop for a while, no longer at the dealer) but I do know in other applications they CLAIM it will just come right off but in actuallity, other components have to be moved first.
The valve looks like a small coke can. It will have a 5 wire connector on the top and bolt to the head on the bottom. If you've searched online for replacement valves then you'll probably recognize it once you see it.
The electrical connector will have 5 wires in it. The following information is based on the ignition switch being in the "on" position with the engine running or not.
--Dark Blue/Dark Green is the sensor ground, DO NOT use a test light to check this, only a multimeter.
--Dark Blue/Violet is the EGR solenoid Control. This should have power on it when the EGR valve is being commanded on. Without a scan tool to actuate the EGR valve, you won't be able to verify this.
--Black/White is the ground for the Control circuit. It appears to go to a chassis ground so you may use a test light (clamped to battery positive) to verify this wire.
--Yellow/Pink is the 5 volt supply wire. You should see 5 volts on it all the time.
--Dark Blue/Light Green is the EGR signal wire. With the sensor unplugged, this will show 5 volts. The computer puts out 5 volts on this wire to check to see if the sensor is unplugged. Once the connector is plugged in then the 5 volts drops down to whatever the signal voltage should be based on EGR valve position, you may be able to remove the valve from the head, plug the valve back in and move the small plunger by hand and watch for a voltage change on this wire. I've not done this before but logic would suggest that a functioning valve would report a voltage change. It's possible that your old one won't report a voltage change and that's precisely why you are having problems with it in the first place.
Let me know if you need additional assistance.
Great. Thanks for the accept and the update. Let me know if you need any assistance in the future.