You're talking about the iPod touch, right?
If as the title of your thread says you are using just the audio jack, i.e. the AUX port, you shouldn't have any problems since the iPod is doing all the work and the car is just receiving its sound output and redirecting it to the speakers.
If you're not using just the audio jack, please give more information about what cable are you using and what exactly is the error message, where it's displayed, etc.