2001 Honda Odyssey Owner's Manual - Page 212

Automatic Transmission Your Honda's transmission has four forward speeds, and is electronically controlled for smoother shifting. It also has a "lock-up" torque converter for better fuel economy. You may feel what seems like another shift when the converter locks. Shift Lever Position Indicator The "D4" indicator comes on for a few seconds when you turn the ignition switch ON (II). If it flashes while driving (in any shift position), it indicates a possible problem in the transmission. Avoid rapid acceleration and have the transmission checked by an authorized Honda dealer as soon as possible. The malfunction indicator lamp may come on along with the "D 4 " indicator if there is a problem in the automatic transmission control system. This indicator on the instrument panel shows which position the shift lever is in. Driving