Code Definition

P2125 — Throttle / Pedal Position Sensor / Switch E Circuit

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

About P2125

P2125 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P2125 is stored, the module has detected 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 P2125 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

Accelerator pedal position sensor E is the second element of the redundant pedal sensor pair used in drive by wire systems, giving the engine control module an independent check on the signal from sensor D. The module supplies each sensor with its own reference voltage and ground, and the two outputs are deliberately offset from one another so a fault affecting both circuits equally can still be detected. DTC P2125 sets when the module finds the sensor E circuit operating abnormally, with the signal outside its valid voltage window, held at a fixed value, or moving erratically instead of track...

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