Code Definition

P2122 — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Ford

About P2122

P2122 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2122 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2122 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

P2122 relates to the same accelerator pedal position channel as P2121 but describes a different failure mode. Where the range and performance code covers a signal that is present but implausible, this code is set when the PCM sees the voltage on the 'D' circuit fall below its lower calibrated limit, commonly under about 0.2V, which is below anything the sensor can legitimately produce even at the fully released pedal position. On Ford electronic throttle systems the pedal assembly houses several independent sensors sharing reference and ground circuits, and a low signal usually means the signa...

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