Resolving SilentKey Error on Ford S-Max DCM3.5 with Foxflash

 Problem: It’s a Ford S-Max with Delphi DCM35 ECU. MPPS, KESS and Foxflash all read ID. But they all have problem reading flash. Kess showing wrong security code. Foxflash showing error SilentKey. The car has before made stage1 by someone else its possible he protected it from reading now or its obd impossible this ECU? I’ve read several 3.5 DCM readings in various Ford MPPS and KESS Fox models and never had a problem. What causes the silent key error?


Foxflash Ford S-Max DCM3.5 OBD Error SilentKey Solution

Possible reason and solution:

1). Ecu has been locked by a previous tuner. Load an original file and start from there.

2). Doing PCM update with Forscan beta or IDS. After that it will be ok.

3). I had the same problem. Write it with Autotuner, but failed, so i recovered it with MPPS, but with an other tool the security code changes automatically on OBD and Bench. So must go for BDM. It is blocked because it is writen with an other tool via OBD, you need the same tool which Stage1 was done or BDM it.

4). Try to use clone PCMflash, I once encountered the same problem in FLEX and Dimsport, which was solved after using PCM.

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