BMW fault code A257
Supplementary control module
SEC2: Button, alarm reset
Module version: Supplementary control module 2 (SECUR2)
In: 7 Series (E67) 2002–2008
Reading and clearing it
Fault code A257 is a BMW code, stored in the car's supplementary control module, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.
The supplementary control module is on: 7 Series (E65), 7 Series (E66), 7 Series (E67)
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