Recently changed brake pads and now ABS and Tract control sensor lights are on

You probably installed the abs sensor wrong and it is throwing a fault or damaged it broke a wire to the abs controler

If you take it an have it checked for DTC'S - diagnostic trouble codes stored in the ABS module I'm sure you will find out what the problem is ! Besides the brake pads have nothing to do with it ! Wheel speed sensors , yes , brake pads no ! Wiring problem , control module , maybe even a ABS relay !

ABS light comes on with ignition then should go off when you start the car.
If abs sensor does not turn off after disconnecting the battery, then there is a real problem, a faulty sensor or ABS malfunctioning.

I'd first make sure the new pads are the correct size. Doesn't happen very often but maybe the parts person gave you the wrong size pads ( for the smoking problem). As for the ABS light, most newer cars will throw out codes if you wait too long to change them out, I would contact a chevy dealer or search online about reseting the code (light).

Traction control and anti-locks(ABS) lights come on there is sensors that are pluged in behind the rotors check and see if they are disconected or loose sometimes when you change your brake pads they might come loose and not making contact.

Sounds like you have loose brake pad linings.
The traction control measures rotational speed between each rear wheel. If your pad lining momentarily causes one wheel to hesitate your trac control will flash. As the ABS detects braking without the brake pedal being pushed, it will flash.
Check your emergency brake pads. They can fall apart inside the drum/rotor combo on the rear. That is where your sensor is for the ABS.

Check to see if your brake pads and rotors are in good condition. Or if you have replaced the pads yourself and have not reset the wheel sensors this would cause the ABS Antilock Brake System light and the ASC Automatic Stability Control light to stay on as the ASC uses the ABS brakes with computer assistance to control the car

Could be just a sensor dirty, or bad connection. Who did the brakes?

Abs and dsc are related and with the light on these won't work. It is possible that you need to go back to where the work was done to look this over.

looks like you have a faulty sensor (ABS) check all conections on hubs you may have disturbed something when you changed your brakes hope this helps