Because the fault analysis is not on site, the following suggestions can only be made for reference. The pressure sensor on the car is generally 5V accurate voltage provided by the ECU, and the signal output of the sensor is only close to 5V. If 12V is found, it is estimated that the wiring harness other live lines and signal lines caused by short circuit. If the ECU function is good, it should generate a fault code. That's what you call a short circuit or a short circuit in the pressure sensor.
Therefore, it is estimated that after the wiring harness is worn out somewhere, other fire lines and signal lines are short-circuited. The verification method is to lead the wire directly from the sensor signal cable to the ECU plug-in end (at the same time, cut the original signal cable connection at the sensor end and the ECU end). If it recovers, it can be confirmed that the wiring harness is faulty.