The code P2120 indicates a problem with the throttle or pedal position sensor or switch “D” circuit in the vehicle’s engine control module.
P2120 Throttle/Pedal Position Sensor/Switch “D” Circuit
Code symptoms P2120.
1. Reduced engine power.
2. Unresponsive throttle.
3. Stalling or rough idling.
4. Check engine light.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2120.
1. Faulty throttle position sensor.
2. Damaged wiring or connectors in the throttle position sensor circuit.
3. Dirty or clogged throttle body.
4. Issues with the electronic control module (ECM).
5. Incorrect throttle calibration or programming.
Code Solutions P2120.
1. Check the throttle position sensor (TPS) and pedal position sensor to ensure they are securely connected and free of any corrosion or damage.
2. Inspect the wiring harness for any signs of wear, fraying, or damage. Repair or replace any damaged wiring as needed.
3. Reset the engine control module (ECM) or powertrain control module (PCM) to clear any stored fault codes and see if the issue persists.
4. Test the TPS and pedal position sensor with a multimeter to verify that they are functioning properly within the specified voltage range.
5. If the sensors and wiring check out, consider replacing the throttle body assembly to address any internal faults that may be causing the circuit issue.