GMC Sierra EV key fob battery
Every model year listed for the GMC Sierra EV has a proven battery. The most common answer is CR2450. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2024-2025Smart key
CR2450
FCC ID YG0G21TB2Two sites agree: americankeysupply.com and uhs-hardware.com (checked Nov 1, 2026)
Find CR2450 on Amazon - 2026Smart key
CR2450
FCC ID YG0G21TB2Two sites agree: americankeysupply.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2450 on Amazon
Changing the battery
Smart key (push-button start)
- Start by freeing the hidden metal key: there is a latch or slide on the case, and the blade comes out once it moves.
- The gap left by the metal key usually has a pry point. A slow twist with a thin flat tool (tape on the tip saves the plastic) opens the two halves.
- Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
- Reassemble, refit the emergency key, and check that the car sees the fob when you press start.
On many recent GM smart remotes a button on the side releases the key; the slot at the bottom is where the case opens.
A CR2450 is 24.5 mm across and 5.0 mm thick, much fatter than a CR2032. A thinner cell will rattle and lose contact, so buy the exact size.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.