Overdrive (O/D) switch: Notes

Fig 1: Identifying Overdrive (O/D) Switch - Selector Lever

Courtesy of FORD MOTOR CO.

The O/D switch is located on the side of the selector lever.

The O/D switch transmits a signal to the PCM to select or suppress 4th gear in selector lever DRIVE position.

The signal of the O/D switch is used for the following functions:

as an input signal to convey the drivers' wishes to the PCM.
to display the drivers' wishes with the O/D indicator in the instrument cluster.

No substitute signal is available for the O/D switch. If it should fail, it is always possible to shift into 4th gear in selector lever DRIVE position.