Note that there is no legal requirement for passengers to provide identification except in states with "stop and identify" statutes:

https://en.wikipedia.org/wiki/Stop_and_identify_statutes

The driver is always required to provide identification showing that they are licensed to operate the vehicle. I'm not a lawyer, but generally if state law does not require providing identification when requested by law enforcement (e.g. as a passenger), then refusing to do so does not constitute probable cause. In some jurisdictions, the requirement for identification does not actually require documentation, just that you give your name and address.