What do these codes mean? P0404 & P1335

[Juzplanekrazy]

I was able to find these 2 codes my truck is throwing through my Insight gauge. The truck lost power and won't run up to full power. I made another thread about it happening and I thought it was because I ran low on fuel and maybe plug the lower filter but thats not it. I changed it and it's clean as a new one.
So what do these codes mean?
P0404: Exhaust gas reculation circuit range/performance
P1335: Unknown.

[ford_doctor]

You report a noticeable lack of power which, when combined with the DTC's you listed, indicates to me that your EGR valve is stuck open. EGR directly affects turbocharger boost and displaces fresh air with inert gasses. Replacing the EGR valve on a 6.4L PSD is not a do-it-yourselfer kind of job. There is a special removal tool and some technicians have reported valves seizing in the mixer housing. Be advised that this EGR valve is not like the one in the 6.0L PSD therefore the diagnostics and repair procedures are different.

• P0404: Exhaust gas recirculation circuit range/performance -This code tells us that the PCM detected the EGR valve is not responding to the commanded position within a given amount of time. This is typically an indication that the valve is sticking or is stuck.

• P1335: EGR position sensor minimum/maximum stop performance - This code means that the EGR valve position voltage is greater than the allowable limit when closed and is not being commanded by the PCM. I have two different specifications for this: 1.3V>2.5 seconds and 1.5V>2.5 seconds but the indication is still the same. The possibilities include a stuck EGR valve, debris preventing the valve from fully closing, wiring concerns affecting the signal voltage or control circuits and the PCM.

[Juzplanekrazy]

Awesome information ford doctor. It will be heading to the dealer first thing tomarrow morning.

[Eric6.4]

Exact same problem here, extreme loss of power at time, drove (limped) 5 mi to dealer and when they started it up later they could not get it to repeat... They cleared the codes and sent me on my way.. Truck has 495mi on it. Hopefully next time it happens I dont get rear ended as it is a instant loss of power.

[Royster]

Mine did the same thing. After the second time (first time dealer cleared codes and sent me on my way), truck would not go over 10mph and no power. Towed to dealer . They replaced the turbo bowl and something elese with the manifold. Runs great again.