Genesis G90 key fob battery
9 of the 10 model years listed for the Genesis G90 have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2017Smart key
CR2032
FCC ID SY5HIFGEO4Two sites agree: uhs-hardware.com and americankeysupply.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2018-2019Smart key
CR2032
FCC ID SY5HIFGEO4Two sites agree: uhs-hardware.com and americankeysupply.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2020Smart key
CR2032
FCC ID SY5HIFGEO4; TQ8-FOB-4F16Two sites agree: uhs-hardware.com and americankeysupply.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2021Smart key
CR2032
FCC ID SY5HIFGEO4Two sites agree: uhs-hardware.com and americankeysupply.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2022Smart key
CR2450
Two sites agree: americankeysupply.com and bestkeysupply.com (checked Nov 1, 2026)
Find CR2450 on Amazon - 2023-2024Smart key
CR2450
FCC ID TQ8-FOB-4F53UTwo sites agree: americankeysupply.com and uhs-hardware.com (checked Nov 1, 2026)
Find CR2450 on Amazon - 2025Smart key
CR2450
Two sites agree: americankeysupply.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2450 on Amazon - 2026Smart key
Not confirmed yet
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.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- Before you take the old cell out, look at its face. Put the new cell in with the same side showing, and avoid touching both faces at once.
- Close the case until it clicks all the way round, put the metal key back, then try the buttons and a push-button start.
A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.
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.