DTC C121C GMC
Throttle Pedal Position Sensor Switch A Circuit Range Performance Problem
Throttle Pedal Position Sensor Switch A Circuit Range Performance Problem
Description
Monitor runs whenever following DTCs are not present: None Either of the following conditions A or B is met: A. Engine switch: On (IG) B. Electric throttle motor power: ON Throttle position sensor malfunction (P0120, P0122, P0123, P0220, P0222, P0223, P2135): not detected
Cause and Solution
Throttle position sensor (built into throttle body) Throttle position sensor circuit ECM
Video Guide
Diagnostic Info
- DTC Code: C121C
- Brand: GMC