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I got my Odyssey 2 weeks ago, everything function well except I have a hard time to understand how the grade logic transmission work. It downshift when I was driving 40 mph down a small slope but did nothing when I am driving 60 mph down a steep hill. The dealer said it's because of the body weight. Does anyone know anything about it? Thanks.
 

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My experience is the opposite. Grade control logic kicks in on a steep slope. My guess is grade control downshifts when the van is accelerating down a slope and senses deceleration when the brakes are tapped.
 
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