查了一下Honda的車主手冊
http://techinfo.honda.com/rjanisis/...07/AC0707OM.PDF

2 就是鎖定在 2

Second(2) - This position locks
the transmission in second gear. It
does not downshift to first gear
when you come to a stop. (第175頁)


Toyota 的車主手冊
https://www.toyota.com/t3Portal/doc...df/OM33748U.pdf

2 則是1-2檔在跳

“2” (Second range):
First or second gear will be selected
automatically according to the vehicle
speed or driving conditions. This range
is to be used when engine braking
stronger than that of the “3” range
position is necessary. (第166頁)

另有提到

Do not continue hill climbing or
hard towing for a long time in the
“3”, “2” or “L” position. This may
cause severe automatic transmission damage from overheating. To
prevent such damage, “4” position
should be used in hill climbing or
hard towing. (第163頁)

OD檔就是該變速箱的最高檔