The throttle position sensor or its circuit is malfunctioning.
Have this diagnosed before driving further
Informational only. Consult a qualified mechanic.
Have the TPS inspected and replaced immediately. May cause erratic throttle response.
The P0120 OBD-II diagnostic trouble code (DTC) indicates: throttle position sensor circuit. This is a high-severity powertrain code that your vehicle's onboard diagnostics system triggers when the throttle position sensor or its circuit is malfunctioning. If your check engine light is on with this code, you should have the vehicle inspected immediately before driving further.
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