Why is your interlock shift engaged on your 2001 dts?

The interlock shift on a 2001 Cadillac DTS is engaged primarily as a safety feature. It prevents the driver from shifting out of "Park" unless the brake pedal is pressed, ensuring the vehicle doesn't accidentally roll. This mechanism helps to avoid unintentional movement and enhances overall driving safety. If the interlock is not functioning properly, it could indicate an issue with the brake light switch or the interlock solenoid.