The problem code P2135 OBDII shows that the Powertrain Control Module (PCM) has encountered an erroneous reading on the voltages transmitted by the Throttle Position Sensor (TPS) A or B.
The Accelerator Position Sensors are located at the entrance of the throttle body. Their voltage outputs must remain close to each other within a certain range. Therefore, the PCM will constantly compare both readings to test their efficiency and timeliness.
Individually, each Accelerator Position Sensor will send the PCM a voltage signal in correlation with the position of the throttle plate. This signal is interpreted by the PCM as the percentage of the throttle opening. This code is set if one TPS Sensor is reading at half throttle and the other sensor is reading at full throttle.