As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON TAKEOFF RECEIVE A NOSE WHEEL STEERING INOP MSG. RAN THE QRH AND CONTINUED TO CAE. WHILE ON APPROACH CREW DECLARED AN EMERGENCY AS A PRECAUTION. AIRCRAFT LANDED WITHOUT INCIDENT. PERFORMED SYSTEM RESET PER SYSTEM RESET MANUAL CRJ900 PAGE 1-9. FAULT DID NOT REOCCUR. R & R LANDING GEAR SELECTOR VALVE. OP AND LEAK CHECK GOOD.