Replaced the anti teft control module

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your Acadia. Since you replaced the anti-theft control module and the car still won't start, it's possible that the module needs to be reprogrammed to the vehicle's system. Many anti-theft modules have to be paired with the car's ECM (Engine Control Module) or BCM (Body Control Module) to allow the vehicle to start. If it hasn't been reprogrammed correctly after replacement, the car may not recognize the new module, preventing the engine from cranking. I suggest checking the connections to ensure everything is installed correctly and then having the module programmed at a dealership or an independent shop with specialized equipment that can sync it with your vehicle's security system. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!