GMC Hummer EV key fob battery
2 of the 5 model years listed for the GMC Hummer EV have 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.
- 2022Smart key
Not confirmed yet
- 2023-2024Smart key
CR2450
FCC ID YG0G21TB2Two sites agree: bestkeysupply.com and uhs-hardware.com (checked Nov 1, 2026)
Find CR2450 on Amazon - 2025Smart key
Not confirmed yet
- 2026Smart key
Not confirmed yet
Changing the battery
Smart key (push-button start)
- Most push-button fobs hide a metal backup key. Press or slide its catch and draw the key out first.
- 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.
- Snap the halves back together, slide the metal key home, and press each button, then try the start button from the driver's seat.
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.
Coin cells are a choking and burn hazard for children. Store the spares in their original pack, out of reach.