P0546 code reads in the manual as the responsible module is the ECM. It is a beeper code of 5 beeps, the check engine light is on in the info center.
The ECM is reporting that the exhaust temperature sensor is shorted to 12 volts and Exhaust gas temperature has an open circuit.
Possible cause; Damaged Sensor, Damaged Circuit wires, Damaged Connector or damaged ECM output pins
You will have normal operation when the fault is recovered.
I hope this helps you.
Karl