P0449 & P0455

[02Lightning]

I just got these two codes on the title. I changed my purge valve last year, and it cleared a P0496 code. I guess I'll go after the vent valve this time. Only other ideas I have is the pressure sensor on the gas tank. What's everyone think, is this the right track?

 

[02Lightning]

So, installed these two items last night and cleared the codes. I'll wait and see what happens.
https://www.amazon.com/gp/product/B00RW3A04E/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B0055B121U/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

 

[funymuny]

What was the verdict? I have P0449 code. I cleared it once and it came back within 10 minutes of driving. The original gas cap does not seem to fit as snugly anymore. But this code means an electronic issue, or so I thought.

 

[02Lightning]

All fixed, light didn't come back on.

 

[funymuny]

Alrighty, thanks. I will give it a try. I don't have a lift (but have a friend who does)...either way, looks fairly DIY, even if laying on the ground. Great thing about the Yukons, and 4WD, lots of room underneath.

 

[02Lightning]

Alrighty, thanks. I will give it a try. I don't have a lift (but have a friend who does)...either way, looks fairly DIY, even if laying on the ground. Great thing about the Yukons, and 4WD, lots of room underneath.

I just backed it up on some ramps, plenty of room.

 

[funymuny]

Makes sense. I have ramps. Thanks for the post. Lots of useful info here.