The code P2121 indicates an issue with the throttle or pedal position sensor or switch “D” circuit, specifically relating to a range or performance problem.
P2121 Throttle/Pedal Position Sensor/Switch “D” Circuit Range/Performance
Code symptoms P2121.
– Engine stalling or surging
– Reduced engine power
– Difficulty accelerating
– Check engine light illuminated
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2121.
1. Faulty throttle position sensor (TPS).
2. Wiring issues.
3. Throttle pedal position sensor failure.
4. ECM malfunction.
5. Throttle body issues.
Code Solutions P2121.
1. Check the throttle or pedal position sensor for any physical damage or wear and tear. Replace the sensor if necessary.
2. Inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as needed.
3. Perform a throttle relearn procedure to reset the sensor values and calibration.
4. Clear the error codes using an OBD-II scanner and monitor the sensor readings to ensure they are within the specified range.
5. If the issue persists, consult a certified mechanic to diagnose any underlying problems with the throttle or pedal position sensor system.