Code Definition

P2105 — Throttle Actuator Control System - Forced Engine Shutdown

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

About P2105

P2105 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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 P2105 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

P2105 is part of the throttle actuator control (TAC) system diagnostics on drive by wire engines, where the ECM operates the throttle plate electrically based on accelerator pedal position rather than through a cable. This is a follow on protection code, set when the ECM has already detected a serious throttle control fault and, as a safety measure, commands a forced engine shutdown or a severely reduced power state to prevent unintended throttle behaviour. It almost always appears alongside a root cause code for the throttle body, the throttle position sensors, the accelerator pedal sensor, o...

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