Key programming (add new key / all keys lost) – Passat B6 2.0 TDI (2008) Iamcarhacker

By Juraj · Last updated August 15, 2026

This guide shows how to program a new key or recover keys (including all keys lost scenario) on VW Passat B6 2008 using EEPROM data and OBD programming.

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Used tool in this guide

Autel IM608 PRO 2

professional key programming and diagnostics tool considered one of the best IMMO tools for workshops. Great choice as one-for-all scanenr in car shops.

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Read full review →

Video: How to program key on Passat B6

This video shows full process of reading EEPROM from comfort module and programming new key via OBD.

Supported vehicles

Vehicle
passat-b6

Technical overview

Vehicle	VW Passat B6
Year	2008
System	Immobilizer (Comfort module / BCM)
Procedure type	Key programming (EEPROM + OBD)
Difficulty	Advanced
Time required	~30–90 minutes
Prerequisites	Working key (optional), new transponder key, EEPROM access
ECU type	Siemens Simos PPD

Step-by-step procedure

Attempt OBD programming (optional)

Connect IM608 to vehicle
Turn ignition ON with working key
Go to:
IMMO → Volkswagen → Automatic selection
Select vehicle (Passat Europe)
Try to identify key type (usually ID48)
Attempt key programming via OBD

⚠️Warning: In most cases on Passat B6 → OBD method will fail (cannot read IMMO data)

Read EEPROM from comfort module (BCM)

Remove comfort module (BCM) from vehicle (behind passenger glovebox)
Open module and locate EEPROM chip
Connect EEPROM programmer (IM608 + XP400 or similar)
Read EEPROM data
Save backup file

Reinstall module

Solder EEPROM back (if removed)
Reinstall BCM into vehicle
Reconnect everything properly

Load EEPROM data into tool

Connect IM608 via OBD
Go to:
IMMO → Volkswagen → Control unit
Select correct system
Choose function:
Load EEPROM data from comfort module
Load saved file

Generate IMMO data

Tool will extract:
- PIN code
- CS (Component Security)
Confirm data

Program keys

Turn ignition OFF
Remove key
Follow tool instructions:
- Insert first key → ignition ON
- Wait ~5 seconds
- Remove key
- Insert next key
Repeat for all keys

⚠️Warning:
All keys must be programmed in one session
Old keys not programmed → will be erased

Finish programming

Confirm number of keys (e.g. 2 keys)
Start programming process
Wait for completion message

Additional information & compatibility notes

Used blank key: https://s.click.aliexpress.com/e/_c3rgtObr

Passat B6 uses Immo IV system integrated in comfort module (BCM)
OBD-only programming is usually blocked → EEPROM required
Key type is typically ID48 (Megamos)
All keys must be relearned → system erases previous keys
Engine stalling after start may occur temporarily (not always immobilizer-related)

Alternative tools

RoundupBest OBD2 Scanners for Key Programming (What I Actually Use, and What I’d Buy Next)Read the guide

Legal & safety notice

This procedure modifies vehicle system settings through the control module. Incorrect use may cause faults or warning lights. Always ensure the vehicle is secured and follow proper safety procedures.