Code Definition

P2103 — Throttle Actuator Control Motor Circuit High

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

About P2103

P2103 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 P2103 is stored, the module has detected a signal or supply voltage higher 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 P2103 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 integrated into the electronic throttle body that positions the throttle plate on command from the engine control module. The module drives it through an H bridge output stage that reverses polarity across the two motor terminals to open or close the plate, with a return spring holding the throttle at a default limp position when the motor is unpowered. DTC P2103 sets when the module detects an abnormally high voltage on the motor circuit, which typically means the circuit is open, is shorted to battery voltage, or the motor i...

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