Code Definition

P2102 — Throttle Actuator Control Motor Circuit Low

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

About P2102

P2102 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 P2102 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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 P2102 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

The throttle actuator control motor is a small direct current motor built into the electronic throttle body that positions the throttle plate in response to commands from the engine control module. The module drives it through an H bridge output stage, reversing polarity across the two motor terminals to open or close the plate, while a return spring holds the throttle at a default limp position whenever the motor is not being driven. DTC P2102 sets when the module measures an abnormally low voltage on that motor circuit, which normally indicates a short to ground, an open circuit, or enough r...

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