Where is transmission control module on 2003 trailblazer?

The transmission control module (TCM) on a 2003 Chevrolet Trailblazer is typically located on the side of the transmission itself, near the rear. It can be found mounted on the transmission housing, often towards the driver's side. To access it, you may need to lift the vehicle and remove some protective covers or components. Always consult a repair manual for detailed instructions specific to your vehicle.