These instructions apply to the Porsche Taycan Mk1 (Y1A) 2020-Present.
For other models, please choose your vehicle here.
When the remote on your Porsche Taycan (2020–present) only locks the car from arm’s length, ignores the door handles, or stops responding altogether, the culprit is almost always the small coin cell inside the fob — not anything to do with the car’s high-voltage traction battery. The Taycan ships with Porsche’s smart keyless-entry fob (the same rounded, car-silhouette design used across the current 911, Panamera, Cayenne and Macan range), and tucked inside it is a hidden mechanical emergency blade plus a single replaceable battery. This guide covers how to spot a dying fob cell, the exact battery it takes, how to open the case without cracking the delicate clips, and why cutting a brand-new key is the one job you can’t finish at home.
How to Tell the Fob Battery Is Dying
- Shrinking range. You have to stand right next to the Taycan — or hold the fob against the door handle — before it will lock or unlock. This gradual loss of range is the classic first sign.
- A dashboard key-battery warning. The Taycan’s instrument display shows a low-key-battery message when the fob cell is running down; treat it as a prompt to change the cell rather than an emergency.
- Passive entry gets flaky. Keyless walk-up locking/unlocking and push-button start begin to work only intermittently, especially if the fob is in a bag or pocket rather than in your hand.
- Cold-weather dropouts. A cell that is nearly flat struggles in low temperatures, so a fob that is fine indoors may fail on a frosty morning.
A coin cell in a Porsche fob typically lasts two to four years. If yours is around that age and showing any of the above, fit a fresh cell before suspecting the car’s receiver or the immobiliser.
The Battery You Need
The Taycan smart fob uses a single CR2032 3-volt lithium coin cell — the same cell Porsche fits across its current model range, and the most common fob battery there is. It is sold in any supermarket, hardware shop or pharmacy. Buy a good-quality branded cell (Panasonic, Energizer, Renata, Varta or similar): cheap no-name cells sag under the brief high current the transmitter draws and can give short range even when apparently “new,” and Porsche’s fob circuitry expects a steady 3 V. Fit a standard non-rechargeable CR2032 — rechargeable substitutes drop voltage too quickly under load.
How to Change the Taycan Fob Battery
- Release the emergency blade. Turn the fob over, slide the release catch on the edge, and pull the concealed metal key blade straight out. This blade both opens the driver’s door manually and doubles as your prying tool.
- Open the case. With the blade removed, a small slot is exposed near the base of the fob. Insert the blade (or a slim flat plastic tool) into that slot and gently lever the two halves apart — or ease the tip along the seam that runs around the edge. Work slowly and evenly; the internal clips are delicate, so never force it.
- Note the orientation, then remove the old cell. Before you lift the coin cell out, look carefully at which face — the marked + side or the plain side — is showing. Photograph it on your phone if in doubt. Ease the cell out from under its retaining clip.
- Fit the new CR2032 the same way round. Seat the fresh cell in the identical orientation to the one you removed, pressed firmly under the clip against clean contacts.
- Close it up. Line up the two halves and press them together until they click all the way round, then slide the emergency blade back in until it latches.
⚠️ Copy the orientation exactly. A coin cell fitted the wrong way round makes no contact — and in some fobs a reversed cell can slowly discharge — so always match the face-up direction of the cell you took out rather than guessing. This is why noting the orientation in step 3 matters more than any single “+ up or down” rule of thumb.
Confirm It Worked
Stand back a few metres and lock, then unlock, the Taycan. Full range should return straight away, and walk-up keyless entry should feel instant again. Any low-key-battery message in the cluster clears once the car next reads a healthy fob — sometimes immediately, occasionally after one drive cycle. If passive start works but the buttons don’t (or vice versa), re-open the fob and check the cell is seated squarely.
If a Fresh Cell Doesn’t Fix It
- Re-check orientation and seating. A cell that is upside down, or not fully home under its clip, is the single most common reason a “new” battery seems to do nothing.
- Clean the contacts. A smear of finger grease or light corrosion on the terminals is enough to cause dropouts — wipe them with a dry cloth or a cotton bud.
- Try the second fob. Porsche supplies two keys; if the spare behaves the same way, the problem is more likely the car’s receiver than either fob.
- Rule out the 12 V battery. The Taycan still has a conventional 12 V battery that powers the locking and comfort electronics; if it is weak, keyless entry can misbehave in ways that mimic a dead fob.
New Key or Spare — Why It’s a Dealer Job
Swapping the coin cell keeps the fob’s existing coding, so nothing needs reprogramming and the key works the moment you close the case. Adding a new key is a different matter: a blank Taycan fob has to be ordered against the car’s VIN, cut to match, and then paired to the immobiliser with Porsche’s diagnostic equipment. That makes a spare or replacement key a job for a Porsche Centre or a specialist auto-locksmith — so keep the battery in your second fob fresh too, and you’re never down to a single working key.
Frequently Asked Questions
What battery does a Porsche Taycan key fob take?
A single CR2032 3-volt lithium coin cell — the same size used across Porsche’s current range and available almost anywhere.
Which way up does the cell go?
Match the cell you removed. Note which face is showing before you lift the old one out and fit the new CR2032 the same way; a reversed cell simply won’t make contact.
Do I need to reprogram the fob after changing the battery?
No. A battery change doesn’t affect the fob’s coding, so it works immediately. Only a brand-new key needs pairing to the car.
How long should a Taycan key battery last?
Usually two to four years. Leaving the fob sitting close to the car, where it wakes constantly for keyless entry, tends to shorten that.
Can I still get in and drive if the fob is completely dead?
Yes. Use the emergency blade hidden in the fob to unlock the driver’s door, then follow the Taycan’s handbook procedure for holding the fob against the marked spot in the cabin to start with a flat cell — a dead battery won’t strand you.
Is the key battery anything to do with the car’s EV battery?
No. The fob’s CR2032 is completely separate from the Taycan’s high-voltage traction battery and its 12 V system; changing it has no effect on the car’s charge or range.
If your fob stopped responding suddenly rather than fading — particularly right after 12 V battery or electrical work — the cause may be a stored fault rather than the cell; you can look up what a logged code means on autodtcs.com.
Independent guide — not affiliated with Porsche. Always follow your official service manual and safety precautions. Read our full disclaimer.