These instructions apply to the Hyundai i40 Mk1 (VF) 2011-2019.
For other models, please choose your vehicle here.
If the remote on your Hyundai i40 (VF, 2011–2019) has short range or the buttons no longer lock the car, the coin cell is flat. The i40 remote takes a CR2032 3 V lithium cell and the swap takes a couple of minutes on the kitchen table.
How to Replace the i40 Remote Battery
- If your key has a fold-out blade, slide it out first — this exposes the seam.
- Prise the case apart at the seam with a small flat screwdriver wrapped in a cloth, working gently around the edge.
- Lift out the old CR2032 cell, noting which way up it sits.
- Fit the new cell the same way up, handling it by the edges only.
- Clip the case shut, refit the blade, and check the remote locks and unlocks the car.
Frequently Asked Questions
What battery does the Hyundai i40 key take?
A single CR2032 3 V lithium coin cell — the common 20 mm size sold everywhere. Match the code printed on the old cell and fit a branded lithium one.
Do I need to reprogram the key after changing the battery?
No. A battery swap does not affect the coding, so the remote works straight away. Programming is only needed for a lost or additional key, which a dealer or locksmith codes to the car.
The remote still won’t work with a new cell — why?
Check the cell is the right way up and seated flat, and wipe the contacts. If range is still poor, the car’s own 12 V battery may be low, or the remote may need re-syncing.
If a warning light stays on afterwards, look the code up on our sister site autodtcs.com to see what it means.
Independent guide — not affiliated with Hyundai. Always follow your official service manual and safety precautions. Read our full disclaimer.