P2 128 Fault Code Interpretation, Treatment Scheme and Elimination Method

P2 128 fault code, applicable to all automobile manufacturers, indicates that the throttle/pedal position sensor/switch E circuit is high. Tip: To find the fault code quickly, you can pay attention to the official WeChat account and reply to the fault code, such as "P2 128", and then you can get the corresponding fault code explanation and solution. Background knowledge: 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. The fault causes include the short circuit of the accelerator pedal position (APP) sensor circuit to the positive pole, the failure of APP sensor itself, and the failure of electronic control module (PCM or ECM). Clear the fault code every time after troubleshooting the car. When clearing the fault code, it must be carried out in strict accordance with the fault code clearing method specified by the specific vehicle model, and it is absolutely impossible to simply remove the negative grounding wire of the battery to clear the fault code. Otherwise, it may cause trouble in the following two aspects: First, the control computer of some models loses its "history". As we all know, some models of control computers have automatic memory function. After the battery negative grounding wire is removed, the useful data of the engine operation stored in the random access memory will be erased, which is why some people find that the performance is not good for a long time after maintenance and removal, and the fault code may appear again after short-term driving. On the other hand, some functions may be lost. For example, the function of audio lock is one of the common situations. At this time, it is necessary to decrypt the audio system according to complex programs to restore the normal work of the audio system.