BMW fault code 5D2A
Active cruise control
ACC: Internal control unit fault (non-volatile memory Read total failed)
Module version: Active cruise control (FRR_70)
Reading and clearing it
Fault code 5D2A is a BMW code, stored in the car's active cruise control, 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 active cruise control is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72), Z4 (E85), 1 Series (E87), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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