My 2010 Enclave stopped dead in the driveway. Would not restart. Tried new battery, still no go. Had towed to Buick dealership, was told the ECM was bad and had to be replaced. I was told you cannot buy a 'used' one or find an aftermarket one. My car has been at the dealership for 3 months now and still no part. In the meantime while my car has been sitting at the dealer, someone stole the Catalytic Converter from my car. I am so frustrated as the dealership told me they never get the part in. Does anyone know if you can get an aftermarket one and if so, where?