If the few degree drop in temp is too much, mash the brake and the engine comes back on. If the cabin temp drops lower the engine comes on automatically anyway. *Bad for starter: YMMV, but see above for mine. *Drains the battery: The battery management will actually disable start/stop if the battery is compromised. Auto Start-Stop may not shut your engine off if your vehicle battery is charging, the engine is still warming up, or if you’re using heat or air conditioning. Your vehicle is equipped with a heavy-duty starter and battery to help compensate for a high number of starts and stops.
1- the battery MUST be a AGM battery. 2- if the battery is correct type, it could be a loose connection at the battery. The battery connectors are a PIA to get tight. 3- it could be the IBS going bad on the cable (positive cable I think) Those are the usual issues for start-stop not working.
One of the fuel-saving features of the third-generation Honda Pilot is its stop/start function for the engine. It's a feature that's common on many vehicles from a range of automakers, designed to Automatic stop/start systems do present engineering challenges. The electric starter that was designed to fire your engine a few times a day now has to start the same engine every time the car Does Start-Stop work? Yes, but it depends. Start-Stop was engineered for city driving so, naturally, if you drive around a lot in the city, you’ll save more gas. Edmunds.com carried out their own study and could get around 10 percent better MPG in mostly city driving. Their test saved them roughly .90-1.50 between two cars over an 80 mile
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