My car is at the dealership right now with all 3 ACD lights on. The tech is telling me that he believes the problem is with the ECM for the ACD system. Has anyone else run into an issue like this? I've read many other threads about the ACD system and it seems the most common resolution is to replace the pump. I have yet to read anything about someone replacing the control module. It's a 900$ part?!?!? Of course the pump is more expensive so it would make sense that the dealership would try to replace cheaper things first but if the ECM is not the problem and they end up replacing the pump anyway, I don't want to have to pay the ECM!!! Anyone have a similar issue??? Thanks

 

Do you think this would work - Ralliart ACD ECU?

I don't know what that works out to in $.

 

Interesting. Thanks for the info.