Possible causes

– Faulty throttle position sensor
– Throttle position sensor harness is open or shorted
– Throttle position sensor circuit poor electrical connection
– Faulty Engine Control Module (ECM)

When is the code detected?

If the difference between actual and calculated value exceeds threshold value, the Engine Control Module (ECM) judged this as a fault and the P0121 code is set

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0121 KIA Description

Throttle Position (TP) Sensor measures the opening angle of throttle valve and mounts on the side of the throttle body and is connected to the throttle blade shaft. The TP sensor