Replace the Key Fob Battery

Last updated: June 9, 2026

If the key fob on your DS 5 (2011–2018) has lost its range or the central locking has gone intermittent, the coin cell inside is almost certainly flat. It’s a quick swap with a CR2032, and there’s a simple owner re-sync afterwards if the remote needs it.

Battery First — What You Need

• A CR2032 coin cell.
• A coin or small flat screwdriver.

The DS 5’s key still works mechanically with a dead fob, so you can always get in; the cell only powers the remote locking.

Replacing the Cell

1. Pull out the metal key blade.
2. Press and hold the fob button and remove the button-cell cover.
3. Insert a coin at the ring/seam and gently separate the two halves of the case.
4. Remove the old cell and fit a new CR2032, correct polarity.
5. Refit the cases and the cover, then refit the blade.

Re-syncing the Remote (If Needed)

1. Turn the ignition off, then turn the ignition on.
2. Press the lock button on the fob once.
3. Turn the ignition off and remove the key — the remote is synchronised.

Lost Key or Adding a Spare

A cell swap (and the re-sync) keeps the existing key working. A new key must be coded by a DS / Citroën dealer.

If a Fresh Cell Doesn’t Help

• Check the polarity — an upside-down cell won’t work.
• Use the key blade to lock/unlock in the meantime.
• Still intermittent? A receiver fault can store a code — look it up on autodtcs.com.

Frequently Asked Questions

What battery does the DS 5 key use?

A single CR2032 coin cell.

Do I need to reprogram the key after the swap?

No — at most a quick owner re-sync.

Can I program a brand-new DS 5 key myself?

No — a new key must be coded by a dealer.

The fob is dead — can I still get in?

Yes — the metal blade unlocks the door.

For the service reminder, see our DS 5 service reset guide.