What does engine warning code p2112 TAC system stuck closed mean and what could it cost to repair on my 2002 Volvo cross country?

P2112- Throttle actuator control system stuck closed.

The throttle on your vehicle is not controlled by a cable but by a actuator motor in conjunction with a sensor inside the accelerator pedal. This fault indicates there is a problem with the throttle side of the system. The throttle is either binding, slow to respond, completely stuck or has failed. Other possible causes include problems in the wiring (open/short circuit) faulty connection(s), or battery voltage problems could also cause this. I would try checking the connections to the throttle actuator, and if you are up to it carefully clean the throttle to see if you can save it. Good luck!