VCM totally different then the ECON button. Search on VCM for lots of details here at Piloteers, beware it's a rabbit hole
and you can read for hours. ECON will do NOTHING to turn the VCM off.
Either the S-VCM or VCM Tuner II would be good. Yes buy it online, we have links in other threads or just quick google search. S-VCM is out of Canada, that is what I have. Very easy to do. Hardest part is unclipping the wire plug clip from original temperature sensor. Lots of pictures on here with it.
Warranty with VCM disabled? There are post about what others encountered. The technical......if a dealer notices it they might or might not note it in their system. They could then deny a warranty claim saying it directly caused a problem. Then it's their well paid lawyers against my nit so well paid ones to prove it didn't and was not even related. I do most of my own maintenance, if it does need to go shop for warranty or diagnostics, I remove it just in case. If I ever break down on the road (fingers crossed doesn't happen) I can still remove it before tow truck shows up in less than 5 minutes. Mine is covered with the same black split loom as rest of motor so it does not stand out even if looking hard.
The ECON just adjusts throttle input and some other computer setting for transmission so that it makes everything more conservative. You think your stepping on the gas 1/2 way, computer says only do it 1/4-1/3 and let her get to speed slower. She wants to accelerated, don't down shift, let it take longer. It will also adjust your air conditioning to run less to eliminate drag and reduce MPG. Hot days AC doesn't seem to be cold enough? Turn off ECON. It's in the owners manual I think. Maybe not the small quick guide one but the 3 inch thick one you have to order from Honda.
You can search with my name and I have links with how the transmission modes work and react if you are AWD. Search Sand mode and also snow. This thread has links with links to links
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