Code Definition

P1125 — Throttle position motor fail safe mode

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

About P1125

P1125 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu 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.

P1125 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 throttle actuator control system uses an ECM controlled DC motor to position the throttle plate in response to accelerator pedal demand. DTC P1125 sets when the ECM detects a fault within the throttle position motor or its control circuit and commands the system into fail safe mode. In fail safe mode the ECM removes drive to the throttle motor and the plate is held at a default limp position by the return spring, while engine power is limited through reduced RPM and fuel control. The driver will typically experience a significant loss of power, a high or fixed idle, an illuminated warning ...

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