2017–2020 AD (6th generation)
2017–2020 Hyundai Elantra Key Fob Battery Type and Replacement
The 2017–2020 Hyundai Elantra key fob takes a CR2032 coin cell. How to open the fob without breaking it, and which substitutions actually work.
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Quick answer
The 2017–2020 Hyundai Elantra key fob takes a CR2032 coin-cell battery, available at any pharmacy, hardware store, or online for a few dollars.
Replacing the 2017–2020 Hyundai Elantra key fob battery
- Pry the fob open gently at the seam with a small flathead screwdriver or a coin, working around the edge. Many fobs have a hidden release slot near the key ring or emergency-key blade.
- Note the battery orientation (usually positive side up) before removing the old cell.
- Avoid touching the new battery's faces with bare fingers; skin oils can shorten its life.
- If the fob doesn't work after replacement, check that the battery is seated fully and the contacts weren't bent. Most vehicles do not need re-pairing after a battery change.
Which Hyundai Elantra model years does this cover?
These key fob battery specifications apply to every Hyundai Elantra built from 2017 through 2020 — the AD (6th generation), compact sedan. Nothing in this specification changes between those model years. Pick your year for the engines it offered, what changed that year, and the problems recorded against it.
What changed during the 2017–2020 Hyundai Elantra
- 2017AD generation launch; 2.0L MPI base engine, 1.4T Eco introduced
- 20181.6T Sport sedan added, replacing the previous-generation naturally aspirated Sport
- 2019Facelift: new front/rear fascias, standard LED DRLs, available LED headlights on upper trims
- 2020Final model year before the CN7 redesign; carryover engines
2017–2020 Hyundai Elantra key fob battery: common questions
What battery does the 2017–2020 Hyundai Elantra key fob take?
- A single CR2032 coin cell.
Can you use a CR2032 instead of a CR2025 in a 2017–2020 Hyundai Elantra key fob?
- This fob takes a CR2032, so start there. The two cells share a 20 mm diameter but differ in thickness, and the thicker one does not always seat in a housing built for the thinner.
How do you open a 2017–2020 Hyundai Elantra key fob?
- Slide out the mechanical emergency key first, which usually releases a catch, then part the halves with a plastic pry tool or a coin wrapped in tape. A screwdriver will mark the case and can crack the seam.
Sources
- Ontario Hyundai, Elantra oil type & capacity by model year (all AD engines)
- AMSOIL lookup, 2018 Elantra 2.0L MPI oil spec/capacity
- AMSOIL lookup, 2018 Elantra 1.4L Turbo oil spec/capacity
- AMSOIL lookup (CA), 2018 Elantra 1.6L Turbo oil spec/capacity
- NHTSA recall 21V-301, 2.0L Nu MPI piston oil ring defect
- NHTSA recall 17V-213, MDPS steering connector
- NHTSA recall 17V-063, brake booster failure
- Hyundai Motor America press release, 2022 Engine II litigation settlement
- Edmunds, 2018 Elantra specs (curb weight, fuel tank, mpg)
- Cabin air filter 97133-F2000 fitment (2017–2023 Elantra)
- Engine air filter 28113-F2000 fitment (2017–2020 Elantra)