EGR CODE P0403 - Ford Powerstroke Diesel Forum
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Old 05-22-2013, 10:40 AM
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EGR CODE P0403

I keep getting this code and my engine light is on. Truck is running fine. I erase the code and it comes right back. Any ideas?
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Old 05-22-2013, 11:47 AM
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Is your EGR unplugged?
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Old 05-22-2013, 12:13 PM
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I had to put the truck back to stock to get the turbo replaced. The guy at the dealership told me he noticed that the EGR was unplugged and figured I was using a tuner, so he didn't mess with it or reflash. They don't care about tuners, he just didn't want to mess up any programming I had done. Turbo has been replaced, but I can not find where it is unplugged at. It is also throwing a P20E8 code.
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Old 05-22-2013, 12:32 PM
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I seem to remember some members who had returned their trucks to stock getting an EGR trouble code for stuck valves. Might want to look into that?


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Old 05-22-2013, 12:45 PM
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Quote:
Originally Posted by Hawkeye Diesel View Post
I seem to remember some members who had returned their trucks to stock getting an EGR trouble code for stuck valves. Might want to look into that?


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That is what I am thinking, but I can see and hear the plunger,that operates the valve, move when you shut the truck down. Like I said above, the service rep told me they saw the EGR was unplugged, but I can not find where they saw that at.
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Old 05-22-2013, 03:29 PM
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Did you plug both plug ins back together when you returned to stock? Even with mine unplugged, my plunger still cycles shortly after I shut my engine down. Did you possibly break either of the plastic tabs on the plugs?
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Old 05-22-2013, 03:41 PM
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I did a little research and the plunger activates the the EGR bypass. The EGR is directly in front of that. Gonna try to look at it tomorrow.

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Old 08-23-2013, 02:49 PM
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What did you end up finding was the issue? Having similar issues here.
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Old 08-23-2013, 03:33 PM
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Egr valve. Too much soot plugs it up.

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