ECU manufacturers like Continental do accelerated climate chamber testing. The PCB has to work from -40°C to +80°C, Alaska to Dubai so to speak. That and vibr

ECU manufacturers like Continental do accelerated climate chamber testing. The PCB has to work from -40°C to +80°C, Alaska to Dubai so to speak. That and vibration resistance are the main reasons why common over the shelf components can't "just be used in the car".