BMW fault code 5D31
Chassis Integration Modules
CIM: MLSN+
Module versions: Chassis Integration Modules (CIM), Chassis Integration Modules (CIM_2)
In: 7 Series (E65) 2001–2008, 7 Series (E66) 2002–2008, 7 Series (E67) 2002–2008
Reading and clearing it
Fault code 5D31 is a BMW code, stored in the car's chassis integration modules, 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 chassis integration modules is on: 7 Series (E65), 7 Series (E66), 7 Series (E67)
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