BMW fault code 0078
Stability control
In the stability control, code 0078 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.
On-board network voltage > 16.5 volts
Module versions: Stability control MK4 US (ASC4GUS), Stability control MK4 (ASCMK4G)
In: 3 Series (E36) 1990–2000
Voltage > 18V
Module version: Stability control MK20 (ABSMK20)
In: 3 Series (E36) 1990–2000
Engine speed sensor rear right start recognition
Module version: Anti-lock Brake System MK4G (ABSMK4G)
In: 3 Series (E36) 1990–2000
ASC: Vehicle power > 18 V
Module version: Stability control MK20 (ASCMK20)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, X5 (E53) 1999–2004, Z8 (E52) 2000–2003
DSC: Rotation rate sensor, suspicion of incorrect installation position
Module version: Stability control DSC57 (DSC57)
In: 3 Series (E46) 1998–2006, 5 Series (E39) 1995–2003, 7 Series (E38) 1994–2001, X5 (E53) 1999–2004, Z8 (E52) 2000–2003
DSC: Vehicle power > 18 V
Module version: Stability Control MK20 (DSC_E46)
In: 3 Series (E36) 1990–2000, 3 Series (E46) 1998–2006, X5 (E53) 1999–2004, Z8 (E52) 2000–2003
Reading and clearing it
Fault code 0078 is a BMW code, stored in the car's stability 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 stability control is on: 8 Series (E31), 7 Series (E32), 5 Series (E34), 3 Series (E36), Z3 (E36/7), 7 Series (E38), 5 Series (E39), 3 Series (E46), Z8 (E52), X5 (E53)
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