How to Reset the Tire Pressure Light (TPMS) on a Chevrolet Blazer

1. Set the parking brake and place the vehicle in Service Mode.
2. Make sure the Tire Pressure info page option is turned on in the DIC Options menu.
3. Scroll to the Tire Pressure screen, then press and hold the thumbwheel until the horn sounds twice and TIRE LEARNING ACTIVE shows.
4. Starting at the driver side front tire, hold the relearn tool against the 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.
• There are two minutes to match the first tire and five minutes overall, or the process must be restarted.
• A TPMS relearn tool is required; see your dealer or GM Tools.

Source: 2026 Chevrolet Blazer owner's manual, PDF pages 290, 291. 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.