These instructions apply to the Tesla Model S (2012-2021). For other models, please choose your vehicle here.
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The Tesla Model S (2012–2021) uses a key fob (the ‘car-shaped’ remote) that contains a coin cell. When the remote becomes weak or unresponsive, the cell is almost certainly flat. It’s a quick swap with a CR2032.
Battery First — What You Need
- A CR2032 coin cell.
- A small flat-bladed screwdriver.
Replacing the Cell
- Use a flat-bladed screwdriver to remove the key cover.
- Remove the old cell — don’t touch the terminals.
- Fit a new CR2032 with the positive side facing up.
- Refit the battery cover and the outer cover.
- Test it — press the fob to lock and unlock the car.
If a Fresh Cell Doesn’t Help
- Check the orientation — positive side up.
- Hold the fob close to the car (the door-handle area) while it re-syncs.
- Still not working? Re-pair the fob via the touchscreen (Controls > Locks).
Frequently Asked Questions
What battery does the Tesla Model S key fob use?
A single CR2032 coin cell, fitted positive-side up.
Do I need to re-pair the fob after the swap?
No — a battery change doesn’t lose the pairing.
Can I still get in with a dead fob?
Hold the fob against the driver’s door pillar to wake it, or use the Tesla phone app as a backup key.
How do I open the fob?
Gently prise the cover off with a flat screwdriver at the seam.
If the car won’t recognise the key after a 12 V battery issue, see our Model S 12V battery guide.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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