Code Definition

P1121 — Throttle motor fault

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

About P1121

P1121 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan 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) operates the electronic throttle body using an internal DC motor that positions the throttle plate in response to driver and engine demand. DTC P1121 is set when the ECM detects a malfunction in the throttle control actuator, meaning the commanded throttle position and the actual position reported by the throttle position sensors do not agree, or the motor drive circuit is faulty. The throttle body assembly contains the actuator motor, dual throttle position sensors, a return spring and the throttle plate, and the ECM constantly compares commanded against actual...

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