How to resolve the P2128 trouble code?
2 Answers
Clearing carbon deposits from the intake tract and valve positions, and replacing the throttle pedal position sensor can resolve the P2128 trouble code. The P2128 trouble code, applicable to all automobile manufacturers, indicates a high circuit in the throttle/throttle pedal position sensor/switch E. The effects of a malfunctioning electronic throttle position sensor on the vehicle are as follows: 1. Inability to measure the throttle position signal. Cause: Open circuit in the wiring between the ECU and the sensor. 2. Weak engine acceleration. Cause: The two sets of resistors inside the sensor cannot detect each other, preventing the ECU from obtaining the correct current position of the throttle pedal, resulting in weak engine acceleration; failure of one set of resistors in the potentiometer causes the ECU to receive incorrect signals.
I remember one time my car showed a P2128 code, and I was really worried at the time. After quickly checking the information, I found out it was a fault indicating that the signal voltage from the throttle position or throttle sensor was too high. Simply put, those sensors might have issues, such as loose wiring, a faulty sensor itself, or dust clogging it. I tried fixing it myself first: I checked the wiring harness under the accelerator pedal for any wear or broken wires, then used an OBD scanner to check the real-time data, and sure enough, the voltage was too high. After clearing the code and taking a test drive, if the issue reappeared, it meant the sensor needed replacement. I replaced it with a new one for about a hundred bucks, and after installation, the problem was solved. When driving, it's important to avoid letting anything obstruct the throttle area, and developing a habit of checking the floor mat before starting the car can help prevent this issue. If DIY efforts don’t go smoothly, don’t push it—getting professional help is much more cost-effective than making things worse. In short, safety first—don’t let your car break down on the road!
