Transmission Control (TC) Switch

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

The TC switch:

is located on the end of the selector lever.
- The TC switch is not removable from the selector lever. Install a new selector lever if a new TC switch is required.
is a momentary contact switch.
commands the powertrain control module (PCM) to disengage or engage the overdrive function of the transmission.
- When overdrive (D) is disengaged, the message O/D OFF will illuminate on the instrument panel.