How to Reset the Tire Pressure Light (TPMS) on a Cadillac CT6

1. Set the parking brake and place the vehicle in Service Mode.
2. Make sure the Tire Pressure info display option is on, then scroll to the Tire Pressure screen with the five-way DIC control.
3. Press and hold SEL in the center of the DIC control until the horn sounds twice and TIRE LEARNING ACTIVE shows.
4. Hold the relearn tool against the driver side front tire sidewall near the valve stem and press its button until the horn chirps.
5. Repeat at the passenger side front, passenger side rear, then driver side rear tire; two horn sounds end the process.
6. Turn the vehicle off and set all four tires to the pressure on the Tire and Loading Information label.

• Needed after rotating tires, replacing TPMS sensors, or swapping a spare for a road tire with a sensor.
• You have two minutes for the first tire and five minutes overall, or the process stops and must be restarted.

Source: 2020 Cadillac CT6 owner's manual, PDF pages 329, 330. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.