P0121
Description:
P0121: Throttle Position Sensor (TPS) “A” Circuit Range Performance Problem
Causes:
TPS Sensor / Throttle Body
Wiring
PCM
Confirmed Fixes:
Throttle Body — 🎯 1
Custom Car Pete: 2009 Buick Enclave with the 3.6 I would clear this code and it would come back 1 to 3 weeks later. I decided to disassemble the throttle body to see if I could find anything and I found a deteriorated spot on the PCB where the wiper runs. The TPS sensor is part of the throttle body and is not serviceable so I replace the throttle body. The code is gone now and the Buick is fixed.