Start the Car With a Dead Key Fob Battery

Last updated: June 11, 2026

Renault Captur (Mk1, 2013–2020) uses the same Renault hands-free keycard family as the Clio of the period, and the starting chip inside it needs no battery to work. So a flat keycard battery will not strand you: the engine will still start once you present the card correctly. The Captur Mk1 was sold both with a dashboard card slot on lower trims and with full push-button hands-free start on higher trims, so identify which one you have before you start.

A “Keycard battery low” message in the instrument panel is the early warning. It often shows for some time before the card actually fails, so treat it as a cue to fit a new cell.

Starting the Captur Mk1 with a dead keycard

1. Get into the car first using the emergency key (see the next section) if the doors will not unlock by remote.
2. If your Captur has a card slot in the dashboard: push the keycard firmly into the slot until it clicks.
3. If your Captur has push-button start with no slot: hold the keycard flat against the START/STOP button.
4. Press the brake pedal fully.
5. Press the START button. The car’s antenna energises the card chip and the engine starts.
6. Keep the engine running until a fresh cell is fitted, as the car may not detect a dead card to restart.

Unlocking the door with the emergency key

1. Press the release catch on the keycard and slide out the integrated metal key blade.
2. Find the lock barrel on the driver’s door handle, usually hidden under a small plastic cap.
3. Remove the cap to expose the lock.
4. Insert the blade and turn to unlock. The alarm may sound; it stops once the car reads a valid card and starts.
5. Return the blade into the card body before driving.

How the card slot and transponder work

The keycard combines a battery-powered radio transmitter, used for the remote lock and unlock buttons, with a separate transponder chip that runs without any battery. Inserting the card into the dash slot, or holding it on the START button, places the chip inside the car’s antenna field, which powers it long enough to read its code. That is why a completely flat card still starts the Captur but can no longer operate the central locking by remote.

Replacing the keycard battery

The Captur Mk1 card uses a single CR2032 3V coin cell.

1. Slide out the emergency key blade to release the card cover.
2. Unclip the rear cover using the tab to reach the battery.
3. Take out the old CR2032 and fit the new one, matching the polarity marked inside.
4. Clip the cover back on and reinsert the blade.
5. Stand beside the car and press a card button a few times to re-sync. The warning clears at the next start.

Frequently Asked Questions

Does my Captur Mk1 have a card slot? Lower trims do, with a slot on the dash. Higher trims have hands-free push-button start instead, where you hold the card on the START button.

Can the emergency key start the engine? No. The blade only unlocks the door; the card must be in the slot or on the START button for the engine to start.

What battery does the Captur Mk1 keycard take? A CR2032 3V lithium coin cell.

Where is the card reader zone on the push-button version? Hold the card directly against the START/STOP button; the button doubles as the reader on hands-free trims.

Why does the alarm sound when I use the blade? Opening with the mechanical key bypasses the remote, which can trigger the alarm. It cancels when the car reads a valid card.

If a dashboard warning or a stored fault code appears after the keycard dies, you can look it up on autodtcs.com.