How to deal with p0 122 fault code?

The P0 122 fault code indicates that the throttle/accelerator pedal position sensor/switch A circuit voltage is too low. In the Electronic Throttle Control (ETC) system, the function of the accelerator pedal position (APP) sensor is to transmit the position of the accelerator pedal to the throttle control module in the form of an electrical signal, which serves as a reference for the throttle actuator to control the throttle opening.

This fault code indicates that the signal voltage of electronic accelerator pedal position sensor A is lower than the calibrated minimum value (0. 17v). The fault causes include open circuit of sensor signal circuit, short circuit of sensor signal circuit to ground, open circuit of sensor reference voltage circuit, fault of sensor itself or fault of electronic control module (PCM or ECM), etc.

Cars with electronic throttle have no throttle position sensor. Electronic throttle includes throttle position sensor, idle valve (including air conditioning accelerator valve) and some throttle pipes in electronic throttle assembly.

Electronic throttle control system is mainly composed of accelerator pedal, pedal displacement sensor, ECU, data bus, servo motor and throttle actuator. The displacement sensor is installed in the accelerator pedal to monitor the position of the accelerator pedal at any time. When it is detected that the height position of the accelerator pedal changes, the information will be sent to the ECU instantly. The ECU will calculate and process these information and data information from other systems to calculate a control signal, which will be sent to the servo motor relay through the line. The servo motor drives the accelerator actuator, and the data bus is responsible for the communication between the system ECU and other ECU. (Photo/Text/Photo: Chen Miaoling) Wenjie M5 Chuanqi GS8 AION V Macchiato DHT PHEV Latte DHT Gaohe HIX @ 20 19