I own a A6 c6 3.2 avant Quattro. For some reason I have been getting an immobilizer code but when I try to access the controller it either says it's not responding or my vcds problem stops responding when trying to access the controller. First question, is my immobilizer controller in the dash or ECM? Second question, if there is a short in my ECM would it also effect other controllers like my evap system? Reason I ask is bc I keep getting an implausible signal p2404 evap code even after replace purge valve, gas cap, LDP and passing a smoke test. Any and all help/info is greatly appreciated. Thanks

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