BMW fault code A1AC
Amplifier
In the amplifier, code A1AC 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.
AMP: Speaker, surround, signal: short circuit
Module version: Amplifier (AMP_60)
Which BMWs have this version depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
AMP: Internal control-module fault (power-ICs)
Module version: Amplifier (AMPH56)
In: 5 Series (E60) 2003–2010, 5 Series (E61) 2004–2010, 6 Series (E63) 2003–2010, 6 Series (E64) 2004–2010
AMP: Internal control unit fault (power-ICs)
Module version: Amplifier (AMPHH2)
Which BMWs have this version depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
AMPT: No RAD_ON signal even though the engine is running
Module version: Amplifier (AMPTLR89)
Which BMWs have this version depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
Reading and clearing it
Fault code A1AC is a BMW code, stored in the car's amplifier, 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 amplifier 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), 1 Series (E81), 1 Series (E82), X1 (E84), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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