GMC Terrain OBDII Code P0121 Diagnosis | Drivetrain Resource
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GMC Terrain OBDII Code P0121 Diagnosis | Drivetrain Resource
P0121 is a somewhat common trouble code with the GMC Terrain. It's an OBDII code and has to do with the Throttle Pedal Position Sensor. It is relatively serious problem since it leaves your vehicle in failsafe mode. P0121: Throttle Pedal Position Sensor → Switch (TPS) A Circuit Range → Performance Problem OBDII code P0121
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