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My 2005 hybrid threw all 3 of these codes simultaneously this morning, and while I can find individual solutions online I'm wondering if anyone knows whether there might be something else causing the combination of codes to happen at the same time. This might be in my head, but I thought acceleration seemed ever so slightly rough as well.

I've had P2000 come up in the past which I'd determined was related to these service bulletins: 07-036 and 11-043, but the local Honda dealer insists that only one of them applies despite both of them clearly listing "2005 Civic Hybrid M/T". I can check where they punched the VIN to see which one it was, if that helps diagnose the current issue.

I found this bulletin that might explain the P1457 code: 08-016, and a few search results have suggested the P1679 could be as simple as a dirty throttle body, or possibly an issue with the electronic throttle control system. But again, not sure if there's a completely separate issue that could be to blame for all three codes happening at the same time.

I'm supposed to be starting a 14 hour road trip tomorrow, so any help would be very much appreciated!

 
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Not sure how it works with the Honda systems but on some vehicles (specifically the Volvo's where I'm a service writer), when they experience low voltage/loss of power instances, the computer will cut power to the emissions system first as a way to preserve power for the more "critical" components. If that logic applies, P1679 would cause P2000 and P1457.

Check your main fuses to make sure they're all good, and then clear the codes. Drive it for a good bit (probably an hour of mixed driving) and see if it comes back. Since it's a hybrid, there's a non-zero chance something's up with your battery.

 
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Ok thanks, I'll give that a try and report back!