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Overdrive OFF (Diesel Engine Vehicles)

The Overdrive OFF transmission control (TC) switch is a momentary contact switch located on the end of the transmission selector lever which is used along with the Overdrive OFF indicator lamp (TCIL). When pressed, the Overdrive OFF switch sends a signal pulse to the PCM to only allow automatic upshifts that include 5th gear. Overdrive, or 6th gear, is disabled during Overdrive OFF mode. Pressing the Overdrive OFF button again restores automatic upshifts from 1st through 6th gears.

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