The vehicle has a TSC feature as part of the StabiliTrak system. If TSC detects thatthe trailer is swaying, the vehicle's brakes are automatically applied.

When TSC is applying the brakes, the TCS/StabiliTrak indicator light flashes to notifythe driver to reduce speed. If the trailer continues to sway, StabiliTrak will reduceengine torque to help slow the vehicle.
TSC will not function if StabiliTrak is turned off. SeeTraction Control/Electronic Stability Control.
Recreational Vehicle Towing
Trailer Hitch Replacement#PIT5200A: HVAC Blows Cold Due To Low System Voltage Or DTC B101E Symptom 4B - (Nov 8, 2013)
Subject:HVAC Blows Cold Due To Low System Voltage Or DTC B101E Symptom 4BModels: 2010 - 2014 Chevrolet Equinox2010 - 2014 GMC Terrainwith Auto HVAC System (RPO C68)This PI was superseded to update model years and diagnostic info. Please discard PIT5200.The following diagnosis might be helpful if th ...