BMW fault code D704
Single-axle air suspension
EHC: K-CAN line fault
Module versions: Double-axle air suspension (EHC2RR), Single-axle air suspension (EHC_70), Single-axle air suspension (EHC_E65)
In: 5 Series (E61) 2004–2010, 7 Series (E65) 2001–2008, 7 Series (E66) 2002–2008, 7 Series (E67) 2002–2008, X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011
Reading and clearing it
Fault code D704 is a BMW code, stored in the car's single-axle air suspension, 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 single-axle air suspension 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)
Coming soon
Enter your email address to hear when AutoLingo for BMW is ready.