Bought 2014 Prius - check engine - P0441 and P0455

Do you have another car that you could swap gas caps with?

 

no but maybe the emissions warranty, check with a dealer.

 

It wouldn't hurt to do a visual inspection of your gas cap and where it seats when you install it. You could try cleaning it.

 

Not sure what/how you'd check, but could previous owner filling gas tank right up to the neck have caused this? There's a miles per tank faction that like to do this.

 

I wonder if the evap system hose is leaking somewhere. Will wait for an update

 

So lights are off now? Hopefully stays that way, and it was an aberation. At least it's on record with them.

 

Looks like you just missed the 5 year 50,000 mile emission warranty coverage. Darn!

 

I have a 2013 Prius IV, and I noticed that we got the same code after my wife scraped the bottom of the car on a high driveway entrance. we got P0441 and P0455. I replaced the gas cap and cleared the code, but the light came back on the next day. I am going to have to have someone visually inspect the emissions system. Was told by a mechanic that it could be a wire to a sensor was pulled or evap valve, broken canister or a leak in the system from the fuel tank to the intake manifold. Hope it's something simple and not so costly.

 

I have a 2010 Prius IV with P0441 P0445 P0446.

What did it turn out to be?

 

So this is kind of an old thread, but I trust some of you read all of the posts. I hope you're all doing well. I recently got this infamous p0455, and I did find that the gas cap was improperly installed. I don't want to force a reset. How long does it take for the check engine light to reset itself?

 

Usually, it's on a mileage basis, so usually after a couple of hundred miles, it will clear up on its own. I would very much advise just hooking up to a scan tool and clearing the codes as you can then find out if the issue is resolved or not. If the gas cap was improperly installed however, I almost 100% guarantee that was the issue.

 

Thank you. I was hesitant to clear it because it's due for emissions inspection and I think the check when the codes were cleared, but a couple hundred miles is to long to wait.
I'll clear it today

 

Every trouble code has its own confirmation pattern that can be looked up in the repair manual.

Toyota Service Information and Where To Find It | PriusChat

There are very few, if any, that depend on driving a certain number of miles. But a lot of them depend on doing enough driving with the engine warmed up to cover a certain variety of driving conditions, which can be different for each code. People simplify that to just "go do a whole bunch of driving", which usually means you'll have covered the needed driving conditions.

For a "current" code (one that lights the dash light) to go away without being cleared takes 40 drives with no malfunction noted. For the "permanent" code (the version the ECM remembers but without lighting the dash light) to go away takes three separate drives with all the monitor conditions being met and passing results.

For some codes, the monitor test doesn't even happen while driving. The evap system tests itself while the car is off, about five hours after shutdown. Sometimes you see questions on PriusChat like "I went in my garage last night and why was my Prius humming?'. That's the evap test.

I just saw this later post. You might want to rethink that, especially if you have an inspection due. When you clear, you will reset all of the car's emission monitors to 'incomplete' status, and you will have to wait for all of them to meet all of their confirmation conditions again with passing results before your car will pass inspection.

If there was just one trouble code that you know you had and you know you fixed, it is better to avoid doing a clear, and instead just drive the confirmation pattern for that code.

 

Oh look, it went out. Yay!