Losing all keys to your Citroën Jumper 2021 can be a frustrating experience, but with the right tools and knowledge, it’s possible to program a new key. Below is a step-by-step guide based on a real-world procedure performed by an automotive locksmith.

Tools and Equipment Required

• VVDI Key Tool Plus – Necessary for direct key programming.
• EEPROM adapter – Used to read and write data from the immobilizer chip.
• Soldering equipment – For carefully removing and reinstalling the chip.

Step-by-Step Procedure

1. Accessing the Immobilizer Module

• The immobilizer module in the Citroën Jumper 2021 is located behind the dashboard.
• Carefully remove the casing by releasing the side and top clips to avoid damaging the connectors.

2. Removing and Reading the EEPROM Chip

• Locate the EEPROM chip (95640) on the immobilizer board.
• Desolder the chip gently to avoid damaging the circuit board.
• Solder the chip onto an EEPROM adapter to read its data.

3. Extracting Key Data and PIN

• Identify the stored key data and extract the vehicle’s PIN code.
• The dump revealed two existing keys, but the goal was to program four new keys.

4. Writing Key with vvdi key tool plus

• Prepare new key transponder chips by writing the extracted PIN and new key data.
• Each key was programmed sequentially, with the fourth key added to the immobilizer’s memory.
• Verify that all four keys were successfully written before proceeding.
• Save new key data

5. Write new key data back to EEPROM

• Write the new key data back to eeprom.

6. Testing the New Keys

• Solder the EEPROM chip back onto the immobilizer board.
• Reassemble the module and reconnect it to the vehicle.
• Repeat the test with the second, third, and fourth keys to ensure all work correctly.

Done.