BMW fault code A2B1
Trunk module
In the trunk module, code A2B1 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.
HKL: Electronics, pump
Module versions: Trunk module (HKL_65_2), Trunk module (HKL_E65)
In: 5 Series (E61) 2004–2010, 7 Series (E65) 2001–2008, 7 Series (E67) 2002–2008, 7 Series (E66) 2002–2008
HKL: Rear-lid-lift motor, left: short circuit to positive
Module version: Trunk module (HKL_70)
In: X5 (E70) 2006–2013, X6 (E71) 2008–2014, X6 (E72) 2009–2011
Reading and clearing it
Fault code A2B1 is a BMW code, stored in the car's trunk 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 trunk module 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)
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