taken from another board:
These characteristics are normal; they should not require you to call your Honda dealer. - Quick downshifts. The transmission has a computerized control system called grade logic. When going down a hill, even a light touch of the brake pedal can cause grade logic to downshift to the next lower gear. Downshifting helps to slow the vehicle through engine braking.
- Does not always shift through the full range of gears. This can also be caused by the grade logic system keeping the transmission in the optimum gear for different driving conditions.
- Mechanical noise when selecting a forward or reverse gear. It's normal to hear a slight mechanical noise when moving the shift lever from one gear to another. This noise can sound abnormally loud if any of the windows are down and you are parked next to a wall or another vehicle.
- Vehicle may not hold its position when stopped on an incline in gear (may roll backward when the brake pedal is released). This can occur on most Honda-made vehicles. It is one of the measures used to improve fuel economy.
- Hard shifts before the engine warms up. By design, the transmission shifts a little harder when the engine is cold. It returns to smoother shifting when the engine warms up.
These characteristics are not normal; if you experience any of them, call your Honda dealer. - While driving, the D4 indicator on the instrument panel flashes.
D4 Indicator
- An abnormally loud noise from the transmission.
- Extremely slow or delayed gear engagement, upshifts, or downshifts.
- Abnormal gear slippage during upshifts or downshifts.
- Erratic or excessively harsh shifting.
- Automatic transmission fluid (ATF) leaks.