The only pitfall to rooting at the moment is that the root method involves flashing a Chinese SuperUser App on to your phone. Prompts for root access appear in Chinese, other than that, the root method is easy and takes about a minute.
Are you network branded or unbranded? What's your current software version? There's an upgrade imminent so that might fix your issue.
I manually flashed the upgrade this morning, but don't have a bluetooth enabled car stereo to test.