"Intermittent" P0456 code

[asone]

I read Integra Emissions System Problem thread, but mine is a bit different.

I have a 2026 Type S that I picked up in late September 2025. Since mid December, it started to throw P0456 "intermittently". First time was on 12/11/25. Second time was on 1/11/26. The third time was on 2/11/26. It's weird that all 3 times happened on the 11th of the month.

Since this happened 3 times, I took the car to the dealer. They smoke tested but it was fine. So, they just cleared the code and that was it. No fix was made. Because nothing was done, I'm suspecting that this will happen again. I do wait well over 10 seconds before removing the gas nozzle after pumping the gas. I did try opening and closing both the outer flap and the inner flap a several times, but that didn't help.

Below is exact words on the paperwork.

Customer's concern of customer states vehicle will no longer make popping noise from exhaust and pulled DTC for P0456 at this time. Checked for service bulletins, service messages, recalls and service history. Road tested. Performed a visual inspection. Performed a diagnostic scan using the I-HDS and found DTC(S) P0456 in history. Performed evap test with smoke machine and no leaks found. Performed exhaust valve test and everything working as should. Cleared pending DTC. Inspection and diagnostics found no failed or defective components. No part replacement or repairs were made at this time. Performed test drive again after clearing DTC now vehicle will make popping noise. DTC history was a intermittent issue due to no leaks found on vehicle.

Did this happen to anyone? Was anything eventually got fixed?

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[ChromaPop]

I have a feeling that cannot be a coincidence that the code was thrown three times on the 11th of the month. The odds of that are like 27,000 to 1. I am curious if when you brought it to the dealer there was a software upgrade for the infotainment system and the engine check system? It sounds to me like merely a software error.

 

[asone]

I have a feeling that cannot be a coincidence that the code was thrown three times on the 11th of the month. The odds of that are like 27,000 to 1. I am curious if when you brought it to the dealer there was a software upgrade for the infotainment system and the engine check system? It sounds to me like merely a software error.

I updated my original post with what the tech said on the paperwork. It doesn't sound like he did any software upgrade during this visit. But it sure sounds like a software error because their diagnosis found no issues.

 

[SlippyFist]

are there even software updates for this car? i got mine in october 2023 and i was at the dealership earlier today to replace my expansion tank and i specifically asked them if there were any software or ECU updates available and he said no.

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