Winter and Tire Pressure
Why does the tire pressure warning system always come on during winter?
Most likely, it's not a malfunction. Chances are it is the changing temperature.
If your vehicle has a Tire Pressure Monitoring Systems (TPMS); these systems monitor your tires for punctures and pressure losses. If the tire pressure drops below the TPMS minimum, it will emit a warning.
The problem with cold weather is it causes tire pressures to drop. Using the formula, PV/T= P2V2/T2, you'll find tires lose about one psi for every ten degrees.
So if your vehicle's TPMS system emits a warning, refill your tires and then reset system. There should be directions to reset your system in your owner's manual.
If that doesn't fix the problem, then reach out to Captial Buick GMC.