Electronic Transmission Range Selector Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

When a gear is selected, the Transmission will shift into the range commanded by the ETRS system. The ETRS system components will communicate on CAN 2, CAN 3, and LIN.

The Backup Park Lock functionality is internal to the Transmission, and forces the transmission into Park position under specified conditions. Under these conditions the vehicle is put in Latent Fault Mode, refer to Latent Fault Mode Description .

The K212 Gear Shift Control Module in the ETRS system has no mechanical linkage to the transmission. Instead, the K212 Gear Shift Control Module will provide electrical signals based on customer input to the Engine Control Module, where the customer shift request will be determined.

K212 Gear Shift Control Module Assembly includes:

Park Button - Single push button. Normally open switch that is closed when the button is pressed. Actuation is one push.
Reverse - Push lever forward two positions. Normally open switch that is closed when the lever is moved forward.
Neutral - Push lever forward one position. Normally open switch that is closed when the lever is moved forward.
Drive/Manual - Pull lever back one position. Normally open switch that is closed when the lever is pulled.

The vehicle is equipped with the following Electronic Transmission Range Selector Components:

K212 Gear Shift Control Module
K20 Engine Control Module
K71 Transmission Control Module