A discrepancy between the voltage reading from TPS sensor circuit “A” and TPS circuit “B” where TPS circuit “A” is higher than the specified voltage range by more than 1.6 volts.In the Fiat Punto, the P0121 is going to be caused by: The vehicle’s ECM will control the amount of fuel entering the engine in order to control engine speed.įailsafe mode leaves a vehicle in a state that makes it almost impossible to drive and enjoy.
Since the ECM won’t really know how much throttle response is actually happening when you push the gas. This limited power is a failsafe to keep the vehicle able to move, but not super fast. The vehicle will hardly respond to the throttle at all.Here are the most common symptoms of P0121: The symptoms of P0121 are going to vary by year and model, but they certainly are going to cause noticeable changes in the way that your Punto drives. It’s a general powertrain code, which means that it has the same meaning regardless of who manufactured the vehicles (1996+, Punto or not). P0121 will trigger in your Fiat Punto if it’s TPS “A” circuit has an output voltage that goes above or below the sensor’s normal operating range. There’s a YouTube video below that shows how to go about diagnosis with a scanner. Diagnosing it can be tricky without a good scanner and the knowledge of what you are doing. OBDII code P0121 is a serious problem that requires serious attention. It is relatively serious problem since it can leave your vehicle in failsafe mode. It’s an OBDII code and has to do with the Throttle Pedal Position Sensor. P0121 is a relatively common trouble code with the Fiat Punto.
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