Many older Chevrolet/GM vehicles allow surprising amounts of DIY programming; newer push-to-start models do not. Here's the breakdown.
Onboard transponder relearn
GM's PASS-Key/immobilizer system on many turn-key models supports an onboard relearn — commonly a 10-minute (or 30-minute, repeated three times) ignition-on wait sequence that registers a transponder key without a tool. Common chips include Megamos 13 and Philips 46; the B106/B111 keyway is widespread.
Self-programming remotes
Many GM remotes self-program via an onboard sequence (using the Driver Information Center or a door/ignition cycle) once the key is recognized. Steps vary by model and year.
Push-to-start (newer models)
Newer Chevrolet push-to-start smart keys (FCC families such as HYQ1AA, HYQ1EA by model/year) require an OBD-II programmer and often a relearn window, so plan on a tool or locksmith for these.
Buy the matching fob
Confirm the FCC ID and button count, then shop our Chevrolet key collection. See also how to program a car key fob, the complete key fob guide, and our programming service.
FAQ
What is the GM 10-minute relearn? An onboard wait sequence that lets the immobilizer accept a new transponder key without a scan tool.
Do newer Chevy push-to-start keys program onboard? No — they need an OBD programmer.