DTC P0404, and P0405 PLEASE HELP!!! - Ford Powerstroke Diesel Forum
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Old 01-06-2010, 08:01 AM
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DTC P0404, and P0405 PLEASE HELP!!!

Just a few minutes ago, I was driving down the road at about 45mph, and my tuner started chirping, I looked and it was showing two Trouble Codes

P0404, and P0405.

I know they are EGR codes

Circ Range and Sensor circuit low or something to that effect.
The truck seems to be running fine, I am not running any performance tune, been running the factory tune for about the last 2 or 3 weeks.

Can someone please tell me what I should do about this or what exactly the problem is? This is the first time I have ever seen this truck throw any DTC's...

Any help will be greatly appreciated...Thanks in Advance

Like the signature says, it is a 2005 F-250 4x4 6.0l with 108,000 miles...


Thanks,

Tim
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Old 01-06-2010, 06:55 PM
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Bump, please help me out guys/gals...
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Old 01-06-2010, 07:57 PM
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The p0404 is the Egr valve is sticking people on here claim to clean them but I recommend replacing them depending on what they look like. The p0405 is Egr valve sensor circuit low. As it sits in the truck pin A is on the driver's side, and E is on the passenger side. Check resistance across the pins on the valve. If they are out of spec then the valve is bad. That would be my guess as to what is wrong.
Pins B and C: 50-2,500 ohms
Pins C and D: 2,000-7,000 ohms
Pins B and D: 3,000-7,000 ohms
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Old 01-06-2010, 10:27 PM
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I will do that thanks for the help...I hope the EGR Valve is not bad.
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Old 12-31-2010, 08:04 AM
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O'Reilly now sells the EGR valve w/lifetime warranty.
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Old 01-01-2011, 11:26 AM
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Oh boy. I wonder how long that will last.
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Old 01-01-2011, 01:23 PM
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I had the 404 code yesterday.After reading a lot of different post here I decided to try the cleaning of the EGR valve. It actually came out very easy. I just used a large pair of channel locks and wiggled it out. I cleaned it with carb cleaner and freed the valve with silicone spray and reinstalled it. When I started the motor a large puff of black came out the exhaust pipe and then it started up. I dorve it about 70 miles without a problem but when I checked the trouble codes it showed a 488 and a 1334. I then cleared the codes and drove another hundred miles on the hyway and checked the codes again when I got home and was happy to say it had none. I found a new EGR valve on Ebay for a hundred bucks and bought it just in case.
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