Hi @2458  Welcome to community! Unless you're signing into an in-home device like a TV or speaker Pandora doesn't require an activation code. Can you tell me more about how your experience: What is the make, model and year of your vehicle? If you have an aftermarket stereo, what is the make and model of that device? What is the make and model of your phone? Please include the Pandora app version How is your smartphone connected to your car? (Bluetooth, USB, Aux) Are you connecting to Android Auto or CarPlay Let me know and I'll see what I can find out. Use your mobile device only when conditions allow and as permitted by applicable law. ... View more