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Check Engine Code P0456: Tag Expires in 22 Days

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Sep 8, 2022, 11:20 AM

Post #1 of 3 (345 views)
Check Engine Code P0456: Tag Expires in 22 Days Sign In

So, my check engine light came on: P0456 ("Evaporative Emission System Leak Detected (very small leak).") This happened shortly after I filled up with gas, so I probably didn't tighten the gas cap enough.

I got the code cleared, but, of course, it's not cleared internally yet. And, it's the 8th of the month, and my tag expires at the end of the month. What do I need to do to get the code to clear internally (assuming it was just the gas cap issue) so I can pass inspection? Some places I read said you have to drive 50-100 miles. Other places said you have to drive a certain number of cycles. Still other places said unhooking the battery for several hours would clear the code internally.

I work at home so I don't commute, so I'm basically going to have make special trips over the next few days just to make sure I put enough miles on the car. I'm looking for any advice on what I should do.

Also: if someone hooked a scanner up to the car, would they be able to tell whether there are any internal codes that would prevent the car from passing inspection (even though the check engine light on the dashboard is out)?


2003 Dodge Caravan SE, 3.3L

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 8, 2022, 12:31 PM

Post #2 of 3 (332 views)
Re: Check Engine Code P0456: Tag Expires in 22 Days Sign In

Yes, a professional scanner would be able to tell you the status.

Even if you have cleared the code, the car still needs to go through a complete drive cycle to reset the monitors. Some states allow for some monitors to not be reset but only one or two and that varies from state to state.

A generic code reader likely won't tell you the status of the monitors. You need a better one for that.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 8, 2022, 2:14 PM

Post #3 of 3 (324 views)
Re: Check Engine Code P0456: Tag Expires in 22 Days Sign In

State by state if you meant "inspection stickers" emissions safety items. Here, MA no vehicle can be used on public roads legally if a safety issue is found but just emissions or "not ready" you get a sticker for 30 more days to pass FREE to redo just that - a clean code reading would be fast.

Check your rules can be local or whole state? Find out now just to know anyway,


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