BMW fault code A204

Rear-compartment air conditioning

FKA: Engine control module, communication fault (engine speed)

Module version: Rear-compartment air conditioning (HKA_E65)

In: 7 Series (E65) 2001–2008, 7 Series (E66) 2002–2008, 7 Series (E67) 2002–2008

Reading and clearing it

Fault code A204 is a BMW code, stored in the car's rear-compartment air conditioning, 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 rear-compartment air conditioning is on: 7 Series (E65), 7 Series (E66), 7 Series (E67), X5 (E70), X6 (E71), X6 (E72)

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