Remember when RiCAN turned himself into a pickle (secretly to get out of going to family therapy)?. First, he got kicked off the table by the house cat. Then, he rolled down the sewage. Having no arms or legs he decided to take control of a cockroach's body to be able to walk out of there. Morty is in family therapy, so he can't help.
Now, RiCAN can't remember where he left the portal gun so he decides to hack into a nearby car - help him connect his brain through the OBD port to get control of the Karamba RoboCar and drive off to family therapy (he changed his mind about family therapy).
You must help him break into the CAN Bus and impersonate the Bus command messages to gain control of the vehicle's safety-critical functions - steering and braking - Once you can take control of the car you will have to show RiCAN how to drive off. In the meanwhile a few surprises are thrown at you.
FYI don't get offended if he keeps on calling you Morty.