Code Definition

P1121 — Throttle motor fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Infiniti

About P1121

P1121 is a manufacturer-specific powertrain diagnostic trouble code recorded for Infiniti vehicles. 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.

P1121 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) monitors the electric throttle control actuator, an integrated throttle body assembly that combines a DC drive motor, dual throttle position sensors, a return spring and the throttle plate. DTC P1121 sets when the ECM detects that the throttle motor is not responding correctly to the commanded plate position, indicating an electrical or mechanical fault within the actuator or its control circuit. The system relies on motor current feedback and the two throttle position sensors to confirm plate movement, so motor winding failure, carbon fouling of the bore, or wa...

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