BMW fault code A158
Power module
In the power module, code A158 means different things depending on the version of the module in the car. Find your car below; the app shows the right one for yours.
PM: Closed-circuit current (short-time)
Module versions: Power module (POW_65_2), Power module (POW_65_3)
In: 7 Series (E65) 2001–2008, 7 Series (E66) 2002–2008, 7 Series (E67) 2002–2008
PM: Battery disconnection (closed-circuit current)
Module version: Power module (POW_E65)
In: 7 Series (E65) 2001–2008, 7 Series (E67) 2002–2008, 7 Series (E66) 2002–2008
Reading and clearing it
Fault code A158 is a BMW code, stored in the car's power 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 power module 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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