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Replacing my PASM module with a second hand PASM module. Coding needed?

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I replaced my PASM module with a second hand module from an US car. My car is a Euro spec. I now get C156: Communic. PASM control unit (drive) from PSM, Instrument cluster and Gateway modules.

Is the second hand unit faulty, or does it need to be coded?

Did never had that fault code with my previous module...



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  • Admin

Yes, you will need a PIWIS to do the handover from the old PASM controller to the new one.


1. Connect the PIWIS tester 9718 to the vehicle and start it. Switch on the ignition. >> Continue.
2. Select the vehicle type.
3. Using the >> key, move from the vehicle type to the list of control units.
4. Select PASM and press >> .
5. In the PASM menu, select Control unit replacement and press >> .
6. Select Read codes and press >> .
7. On the screen of the PIWIS tester appears the message Coding read-out complete >> .
8. Switch off the ignition and replace control unit.
9. Switch to the Special functions menu and perform the vehicle handover using the F8 key.
10. In the Special functions menu, erase All fault memories by pressing >> .
11. Switch on ignition. Once the control unit has been replaced, the vehicle data is uploaded under the Write
in data menu (see Section 7). Press >> .
12. PIWIS tester displays Coding write-in complete >> .
13. Carry out a test drive and read out fault memory.

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  • 2 weeks later...

Had my car at my Porsche dealer for coding, and they told me that the second hand PASM module I bought is defective as it will not communicate with the other control units... I ordered another one today and hope this one is ok:)

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  • 3 weeks later...

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