P2135: Throttle/Pedal Position Sensor/Switch A / B Voltage Correlation

The throttle position sensor is part of the air intake manifold’s throttle body. The main function of the throttle position sensor is to track how much air is going into the engine. This information is transmitted to the powertrain control module. From there, the module regulates how much fuel enters the engine based on the amount of air intake detected.

The pedal position sensor is part of the throttle control system. It detects the position of the throttle pedal as you press down on the gas pedal. When you start to take your foot off the gas pedal, the pedal position sensor transmits an electronic signal to the powertrain control module. The more you take your foot off the gas pedal, the more the throttle body opens.

The pedal position sensor and throttle position sensor work together to let the powertrain control module know the acceleration demands of the driver.  Once it learns these demands, the powertrain control module will know how fast the engine must produce power so that the wheels can spin faster to satisfy the demands. It is important that both sensors remain functional in order for the engine to produce the proper amount of power for the vehicle.

If there is ever a problem with the throttle position sensor or pedal position sensor, then you will experience a weaker engine performance. You’ll step on the gas pedal, and it won’t produce as much power as you need. If your engine has a “safety mode,” then it may activate in order to have mandatory reduced power. That way, there isn’t as much demand placed on the engine while the sensors continue to malfunction.

The first thing you’ll want to do is run a diagnostic scan on the powertrain control module. If you see trouble code P2135 in response, then you have a problem with the voltage of the sensors. The throttle won’t be able to open and close correctly when this problem exists. You can’t keep driving for very long because the safe mode will limit your speed to 20 miles per hour.

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Some possible causes of trouble code P2135 may include a wiring problem, bad throttle position sensor, bad powertrain control module, or bad accelerator pedal position assembly.

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