Engine Light - P0441 and P0455 codes

Hey folks, engine light on, plugged in diagnostic reader and getting the P0441 and P0455 codes.

I replaced the purge valve with OEM. Unfortunately, the engine light returned after about 50 miles. The gas cap looks fine...could replace it I reckon just in case. Otherwise, seems I'll need to check the hoses.

2016 Limited with 93k miles

 

Gas cap is usually the first thing to trigger those 2 codes (I'd look their first); sometimes they just don't get the required seal (I'd go OE on this part also as I've had issues w/auto part warehouse brands in past).

You've already handled the next step which would be purge valve...

 

Follow-up....so replaced the gas gap with OEM and replaced the purge valve with OEM, looked at all the hoses. No gas odor, easy gas fillup....I am baffled. Seems like I am down to the charcoal cannister. Disappointing issue with just 94k miles.

 

How do you drive, or what's your useof your truck on a daily pursuit? short trips from home to work most of the time?

 

Do you top off the tank when filling or stop after it clicks?

 

I drive it on weekends...maybe 5k miles per year. True, I do sometimes add gas after the first click.

But I am not experiencing the symptoms associated with a faulty charcoal cannister. Is there such a thing as a charcoal cannister sensor that could be malfunctioning?

 

Well, as it turns out, mice ate the lines coming off the top of the fuel tank. Not a cheap repair.

 

So many guys are having problems w/rodents these last couple of years... Hopefully insurance covered it for you at least, and thank you for the update

 

How did you diagnose this, did you have to drop the tank to inspect the wiring (obviously)?