![]() Revving of the engine when gas pedal is not pressed.Surge or even possibly a hesitation when accelerating.Disruption in the accelerator pedal position sensor circuit such as an open, corrosion, poor electrical connection, short, damaged wiring or broken electrical connections.Disruption in the throttle position sensor circuit such as an open, corrosion, short, damaged wiring or broken electrical connections.If the voltage readings of the throttle position sensor and the accelerator position sensor varies too much, then a code P2135 will set. All of this happens within a fraction of a second. It will basically say “ the gas pedal is down 60% thus far so I know that the throttle plate will have to be open in equal amounts (60%):” Then the PCM will send a signal to the throttle position sensors to open them up in accordance to how far the gas pedal is pressed down. The PCM will use the data and compare it to its pre programmed parameters. The accelerator pedal position sensor will tell the PCM how far the gas pedal is pushed down. The PCM expects the readings from each sensor to display similar data because they should all be under the same conditions. The farther the gas pedal is pushed down, the higher the voltage signal from the accelerator position sensor to the PCM should become. It will also send a voltage signal back to the PCM according to how far the pedal is pushed down. The accelerator position sensor is near the gas pedal. To keep things in perspective the accelerator position sensor operates in an identical fashion. The farther the plate is opened the higher the voltage output of the throttle position sensor will be. The throttle position sensor produces a voltage signal according the position of the throttle plate. The signal from each throttle position sensor and the accelerator position sensor must correlate to each other, or a code such as P2135 will set. The P2135 code indicates that the voltage readings produced from the throttle position sensors and or the accelerator position sensor are so distant from each other that they must be inaccurate. The throttle position sensors will be located on the throttle body inlet. If one throttle position sensor is reading at half throttle and the other is reading at full throttle, the PCM will set a code P2135 because the voltage readings will be so remote that it is impossible for the data to be accurate. The PCM interprets this signal as how far the throttle plate is open. Each throttle position sensor will send the PCM a voltage signal in correlation to the position of the throttle plate. ![]() ![]() The PCM will regularly compare the sensor readings as a way to test their efficiency and punctuality. The PCM expects both throttle position sensor outputs to stay within a logical and fairly close range of one another. This particular trouble code indicates that the Power Control Module (PCM) has detected an erroneous reading regarding the voltages transmitted by throttle position sensor A or B, the accelerator pedal position sensor and or the actual throttle plate. Throttle/Pedal Position Sensor/Switch A / B Voltage Correlation What the P2135 code means ![]()
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