Autel IM508 Calculate VAG PCR2.1 ECU CS PIN After New Update

The latest update from Autel has improved VAG PCR2.1 ECU EEPROM/PFLASH read & write capabilities and IMMO data extraction, making advanced ECU work easier and faster for locksmiths and technicians.

Learn the latest updated method to read VAG PCR2.1 ECU immobilizer data using AUTEL IM508 after recent software updates.

We will explain the complete step-by-step process to safely read IMMO data from PCR2.1 ECU using bench mode and programmer (XP400 Pro).

 

New updates improved:

• Adds FLASH reading/writing, EEPROM reading/writing, IMMO data calculation, and EEPROM cloning data conversion functions (in bench mode) for Siemens/Continental series PCR2.1, SIMOS8.3x, SIMOS8.4x, SIMOS8.5x, SIMOS8.6x, SIMOS12.1, and SIMOS12.2 ECMs.
• IMMO data reading stability
• EEPROM & PFLASH operations
• More ECU compatibility

 

REQUIRED TOOLS

• AUTEL MaxiIM IM508/IM608
• XP400 Pro Programmer
• ECU Bench Cable / Adapter (G-box3/G-box2)
• Stable Power Supply
• Laptop (optional for backup)

IM508 supports EEPROM/MCU read-write and IMMO ECU data access, especially when used with XP400 Pro.

 

STEP-BY-STEP PROCESS

Remove PCR2.1 ECU from vehicle.
Open ECU carefully (heat + blade method).
Identify EEPROM / MCU (Common: TC1767 / TC1797).
Connect using bench wiring or Gbox adapter.
In IM508, go directly to Expert Selection.
You will see there will be IMMO Parts, previously, it was Engine.

In IMMO Parts, select Engine.

Select Bench Mode. This is required for reading the PIN code on the PCR2.1 diesel white meter.

Select engine type: Bosch or Siemens/Continental.

Select Siemens/Continental. 

Select ECU type (PCR2.1 / TC1766).

This method works with both GBOX2 and GBOX3 interfaces.

Check the bench wiring diagram.

Choose Read EEPROM / Read FLASH.

CS and PIN code will be found in Flash data. Flash data must be saved.

Then read and save EEPROM data.
Save original backup (VERY IMPORTANT ).

Select Calculate IMMO data.

Load the ExtEEPROM and IntFlash data of the same vehicle to extract IMMO data /CS/PIN from file.

Once both are loaded, click Decode.

The system will process the data and display:

• PIN Code
• CS Code
• MAC ID
• Power Class

Take a photo or note down these details for use during programming.

Go back to Expert Selection- IMMO IV- IMMO IV Instrument CAN.
Select cluster type- VDO NEC35XX.
There will be All Key Lost via OBD mode option.

Here IMMO data will not be read.
What to do for this, do not Press Yes again.
Select No.

It will allow us to input CS and Code manually.

Then generate dealer key and learn key to the IMMO system via OBD.

PRO TIPS

Some PCR2.1 may still need boot mode or external tools (Xhorse Multi Prog etc) for full read.

How to Add VAG MLB Key with Autel IM608 via APB300?

How to add VW Audi Porsche MLB smart key with Autel MaxiIM IM508/IM608 and APB300 programmer?

The MQB48 shares the same procedure.

 

Check vehicle list and update info here:

http://blog.obdii365.com/2026/02/03/autel-im508-im608-mqb-and-mlb-add-key-is-coming/

 

Procedure:

Step 1: Read Vehicle Information

The procedure is straightforward and reads key data very fast.

Select Manual selection-select model and year, for example Audi A4 2016.09 onwards- Control Unit-MLB Immobilizer.

Read vehicle information.

Place a working key in the sensing area and turn on the ignition.
Read and confirm vehicle information.

Step 2: Recognize Key Info

Select Recognize key information.
Connect APB300 programmer with Autel IM508/IM608 via USB port.
Place the working key into the recognition area of the APB300 for recognition
Communicating with the key. The green light on the APB300 will turn on.
Read key data.

Step 3: Calculate IMMO Data

Select Calculate IMMO Data function.
Autel will show you key wiring diagrams.
Select one that matches your MLB key.
Disassemble original key and remove the circuit board.
Remove the capacitors following the diagram.
The supplied terminal wire should be welded when prompted by the on-screen instructions on the tablet.

Place the original circuit board into APB300 programmer.

Read and process key data.
It takes 3-5 minutes to read key data.
Calculate IMMO data, this will take about 1 min.
Key verified in APB300 programmer successfully.
Save key file successfully.

Step 4: Generate Universal Key
Remove the terminal wire from MLB key board and remove cable from APB300.
Choose Universal Key Generation.
Select a 315MHz or 433Mhz frequency.

Must select the correct frequency during the generation process. Cannot change frequency after programming.

Check that a battery has been installed in the universal key, place the ikey in the key slot of the APB300 device.
Generate universal key successfully.

Step 5: Modify Key ID

Select Modify key ID function.
For a locked key, its ID cannot be modified.
For an unlocked key with an FF ID, ID can be modified once.

Modify ID successfully.

Step 6: Make Dealer Key
Select Make Dealer Key
Upload the IMMO data file.
Place a blank key into the key slot of the APB300 programmer and press OK
Generate the dealer key successfully.

Step 7: Learn Key

Select Key learning
Open the hood and turn off the A/C.
Place the key to be learned close to the sensing coil and turn on the ignition.
If the ignition cannot be turn on, turn on the harzard wanting light.
Upload IMMO data file again.
All keys need to be learned.
Place the 1st key at the sensing coil, keep other keys away.
Place 2nd key at the sensing coil, keep other keys away.
Key learning process completed.

 

How to Add VAG MQB49 5C Key with Autel IM508 IM608?

How to Add VAG MQB49 5C 5D Key with Autel MaxiIM IM508/IM608 and APB113 adapter?

Step 1: Read original key data

Go to Expert Mode.
Select Key reading via dump- Key reading via dump for 5C or 5D

Read vehicle information

Read vehicle info and confirm.

Hit OK to continue.

Choose with programmer APB113 or direct connection. APB113 adapter is easier.

Autel will display key wiring diagram. Select one that matches your original key.

Disassemble original key board.

Connect the APB113 adapter with original key PCB following the wiring diagram.

Connect APB113 adapter with XP400 or XP400 Pro. Connect XP400 with IM508/IM608 tablet.

Read IMMO Data.

Read and save immo data.

Step 2: Make dealer key

Select Make dealer key.

Select Make dealer key (wiring). If you add an original key, you need to disassemble original key as well.

Disconnect original key.

Connect a new key to be programmed with APB113 following the same wiring diagram.

Select the immo data saved in step 1.

Writing key data.

Make dealer key successfully.

Disconnect key board from APB113. Disconnect APB113 from XP400 programmer.

 

Step 3: Unlock SFD

For some 2023 models with SFD security gateway, need to unlock SFD first. If the car does not have SFD gateway, go directly to Step 4 to learn key.

Select SFD Unlock function.

The SFD is locked. Select Manually unlock SFD.

Send the unlocking request information to 3rd party or buy Autel 1 SFD token service to get the unlock code. Select Input token.

Input the SFD token here to unlock SFD.

Unlock SFD successfully.

Finish key learning in 90 minutes.

Step 4: Learn Key

Select Key learning.

Select the immo data saved in Step 1 again.

Verify if the vehicle has smart key or not.

All keys need to be learned.

Follow instructions to learn key 1 and 2.

Key learning completed.

Test both keys.

 

Video guide: