The vehicle has a Trailer Sway Control (TSC) feature as part of the StabiliTrak system. If TSC detects that the trailer is swaying, the vehicle's brakes are automatically applied.

When TSC is applying the brakes, the TCS/StabiliTrak indicator light flashes to notify the driver to reduce speed. If the trailer continues to sway, StabiliTrak will reduce engine torque to help slow the vehicle.
TSC will not function if StabiliTrak is turned off. See Traction Control/ Electronic Stability Control.
Towing Equipment
Conversions and Add-OnsTaillamps, Turn Signal, Sidemarker, Stoplamps, and Back-Up Lamps Lighting Bulbs
SidemarkerStoplamp/Turn Signal Lamp/TaillampBack-up LampTo replace one of these lamps:Open the liftgate. SeeLiftgate.Remove the two screw covers from the taillamp assembly.Remove the two screws securing the taillamp assembly.Pull the taillamp assembly out of the vehicle body.Disconnect the lamp wiri ...