What is the meaning of OBD-II code P0123, and what are the possible causes and solutions for this code to be generated?

The code P0123 signifies that the Engine Control Module (ECM) has detected that the voltage output of the TPS circuit A has exceeded the predetermined voltage range for the sensor. This code is a standard OBD-II code. Cause of P0123 code: TPS sensor circuit A exceeded 4.54 volts for over 2 sec, indicating a short in sensor or wiring. To diagnose the problem, a mechanic will typically scan and document codes, clear fault codes, check TPS connections and wiring, compare data, repair any wiring issues, replace TPS if necessary, and road test the vehicle. The resolution for the P0123 code depends on the cause, but common solutions include repairing or replacing the TPS connector for shorting, repairing the wiring short, or replacing the TPS with a new sensor. The P0123 code may require multiple pinpoint tests to fix and may be accompanied by other TPS codes. TPS codes all cause the same ECM failure and drive symptoms.