Fix for persistent PCV CEL codes P0451, P0455,P0456,P0496, or P04F0 -- wire wear & corrosion issue

[MavXL]

So after a few weeks and $400 dollars of parts I finally found the reason why I get a reoccurring CEL with a combination of codes P0451, P0455, P0456, P0496, and P04F0. The worst part is I had to spend $0 to fix it. Through chasing this issue and ended up replacing the fuel vapor separator (purge valve) and the fuel tank pressure sensor which totaled about $400.

Today I was under the truck and decided to volt test the connector to the fuel tank pressure sensor because I was getting a persistent P0451 CEL and a constant static pressure reading on FORScan. I got some erratic voltage and then I noticed the sheath around the wires was worn down and a tiny hole formed in the signal wire and corroded the wire. Spliced it back up and we’re good to go! Not saying the purge valve and/or pressure sensor weren’t bad but before you go throwing your money around check out your wires!

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[MavXL]

Forgot to add, but in the pics you can see where the felt liner was rubbing against the wires. I snipped the wire before I took a pic but it rubbed a hole into the signal wire and corroded the wire.

 

[AYYO]

You just saved me a trip to the dealer and $$$. How can I buy you a beer?!
I was throwing P0446 and P04F0 among others and couldn't figure it out.

Pulled the hairy carpet back, and sure enough, worn through and corroded completely. The wire tape is even worn through the paint on the frame in spots..

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