I have a 2019 Yukon and bought a key on line but to program (per my manual) I needed both original keys. Programming instructions should be in your manual, so you can check.
Got a 2019 Black Graphite Performance edition 6.2 - 10 speed 3.23 rear 22" wheels. Getting 16 to 17 in town and 24.7 (best MPG in 25 miles) on open road. Have 5200 mile on her.
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