BMW fault code 44AC
Engine electronics
In the engine electronics, code 44AC 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.
DDE: Injectors, activation, cyl. 1, 2, 3 (injectors Bank)
Module versions: Digital Diesel Electronics (D50M57A0), Digital Diesel Electronics (D50M57A1), Digital Diesel Electronics (D50M57B1)
In: 3 Series (E46) 1998–2006, X3 (E83) 2003–2010, X5 (E53) 1999–2006
DDE: Injectors cyl. 1, 2, 3, activation
Module versions: Digital Diesel Electronics (D60M57A0), Digital Diesel Electronics (D60M57D0), Digital Diesel Electronics (D62M57A0)
Which BMWs have these versions depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
DDE: Injectors, activation, cyl. 1, 2, 3
Module versions: Digital Diesel Electronics (D50M57C0), Digital Diesel Electronics (D50M57E1)
Which BMWs have these versions depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
DDE: Injectors, activation, cyl. 1,2,3
Module versions: Digital Diesel Electronics (D50M57D0), Digital Diesel Electronics (D50M57E0)
Which BMWs have these versions depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
DDE: Injectors, bank 1, activation
Module versions: Digital Diesel Electronics (D60PSA0), Diesel fuel electronics (D60TMCA)
Which BMWs have these versions depends on the engine and equipment, so we don't list them here; AutoLingo for BMW reads which version your car has.
DDE: Injectors, activation, positive leads (injectors Bank)
Module version: Digital Diesel Electronics (D50M47A)
In: 3 Series (E46) 1998–2006
DDE: Injectors, activation, positive leads
Module version: Digital Diesel Electronics (D50M47B1)
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.
DDE: Injectors, activation, cyl. 1, 4, 6, 7 (injectors Bank)
Module version: Diesel electronics master (D51MM670)
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.
DDE: Injectors, control cyl. 1, 2, 3, 4
Module version: Digital Diesel Electronics (D60M47A0)
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.
DDE: Injectors, positive leads (injectors Bank)
Module version: Digital Diesel Electronics (DDE50K47)
In: 3 Series (E46) 1998–2006, X5 (E53) 1999–2006, Z8 (E52) 2000–2003
Reading and clearing it
Fault code 44AC is a BMW code, stored in the car's engine electronics, 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 engine electronics is on: 3 Series (E46), Z8 (E52), X5 (E53), 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), X3 (E83), X1 (E84), Z4 (E85), Z4 (E86), 1 Series (E87), 1 Series (E88), Z4 (E89), 3 Series (E90), 3 Series (E91), 3 Series (E92), 3 Series (E93)
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