The transmission control module works in tandem with the engine and transmission to keep you and your passengers moving. When you’re driving forward, this is the part that calculates the best time and place to change gears in order to make your driving experience the best it can be.

Aside from this primary responsibility, this control module may also send On-Board Diagnostic II (OBD2) codes to your car’s computer if it detects a transmission malfunction or other issues. These codes appear as the check engine light on your dashboard, alerting you that something isn’t quite right under the hood.