Overdrive Operation

The automatic transmission includes an electronically controlled Overdrive (sixth gear). The transmission will automatically shift into the Overdrive gear if the following conditions are present:
• the shift lever is in the DRIVE position,
• the transmission fluid has reached an adequate temperature,
• the engine coolant has reached an adequate temperature,
• vehicle speed is sufficiently high, and
• the driver is not heavily pressing the accelerator

    See also:

    Onboard Diagnostic System — OBD II
    Your vehicle is equipped with a sophisticated onboard diagnostic system called OBD II. This system monitors the performance of the emissions, engine, and automatic transmission control systems. ...

    Gross Trailer Weight (GTW)
    The GTW is the weight of the trailer plus the weight of all cargo, consumables and equipment (permanent or temporary) loaded in or on the trailer in its loaded and ready for operation condition. ...

    Traction
    When driving on wet or slushy roads, it is possible for a wedge of water to build up between the tire and road surface. This is known as hydroplaning and may cause partial or complete loss of ve ...