KD X4 Programmed 5C Key – Car Starts but Remote Not Working? Here’s the Fix

If you’ve programmed a 5C key using the KEYDIY KD-X4 with a KEYDIY KD ZB Smart Key, and the engine starts but the remote functions (lock/unlock) don’t work — don’t worry. Here is possible solution.

✅1: Update & Reprogram

• Make sure your KD X4 firmware and database are fully updated.
• Reprogram the key again following the correct 5C procedure.

✅2: Disconnect the Car Battery

Sometimes the vehicle BCM needs a reset:

1. Disconnect the car battery for 5 minutes.
2. Reconnect the battery.
3. Relearn/program the key again.

This often restores proper remote synchronisation.

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