This error is an unintended action that may result in a lack of transmission park pawl engagement and possibly delayed rearward movement of the vehicle.
Power Train — Automatic Transmission — Lever And Linkage — Column Shift
On certain pickup trucks equipped with diesel engines and automatic transmissions, in an attempt to exit the vehicle quickly without shutting off the engine and removing the key, the driver may inadvertently leave the automatic transmission shift control in indicated reverse.