BMW fault code A688
Soft top module
In the soft top module, code A688 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.
Coding data incorrect
Module version: Soft top module (CTM_89)
In: Z4 (E89) 2009–2016
CTM: Memory fault
Module version: Convertible top module (CTM_93_5)
In: 3 Series (E93) 2007–2013
CTM: Memory error
Module version: Soft top module (CTM_93_6)
In: 3 Series (E93) 2007–2013
CVM: Hall sensor, convertible top compartment lid open
Module version: Soft top module (CVM_64)
In: 6 Series (E64) 2004–2010
CVM: Fault in coding data
Module version: Convertible top module (CVM_88_2)
In: 1 Series (E88) 2008–2013
Reading and clearing it
Fault code A688 is a BMW code, stored in the car's soft top 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 soft top module is on: 5 Series (E60), 5 Series (E61), 6 Series (E63), 6 Series (E64), X1 (E84), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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