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P2120 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch D Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Throttle/Pedal Position Sensor/Switch D Circuit
P2120 is an OBD-II generic code for the engine control module (ECM) detecting a major failure in the throttle pedal position sensor circuit of a below or above specified voltage return from the sensor.
The ECM is getting a voltage return from the throttle pedal position sensor of below .24 volts or above 4.49 volts, indicating the throttle position sensor is not within specification and causes the ECM to go into failure management mode for limited throttle opening.
The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.
The engine will have limited acceleration and slow throttle response and RPM will be limited.
Depending on the failure mode entered and manufacturer will depend on other symptoms encountered like idle only or limited power and throttle opening.
Scans and documents the code in the ECM to check the freeze frame data for failure
Diagnoses the code as per the manufacturer's pinpoint test
Checks the scan data of the throttle position sensor to see if it is getting the proper reference voltage and is sensing the throttle angle properly.
Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so that the failure may be duplicated and repaired.
Failing to clear the ECM codes after the codes are fixed
Code P2120 is an indication that the ECM detects a major throttle position failure and is in failure management mode. This has limited the RPM that the engine can go since the throttle control actuator system depends on the pedal position sensor for proper control of the throttle.
Code P2120 is major failure of the throttle control circuit and the vehicle may only idle and not allow any throttle control at all.
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