BMW fault code A591

Adaptive Head Light / headlight beam height control

AHL: SMC right faulty

Module version: Adaptive Head Light / headlight beam height control (ALC_60)

In: 5 Series (E60) 2003–2010, 5 Series (E61) 2004–2010, 7 Series (E65) 2001–2008, 7 Series (E67) 2002–2008, 7 Series (E66) 2002–2008

Reading and clearing it

Fault code A591 is a BMW code, stored in the car's adaptive head light / headlight beam height 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 adaptive head light / headlight beam height control is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), 7 Series (E65), 7 Series (E66), 7 Series (E67)

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