Code Definition

P1125 — Tandem TP Sensor

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

About P1125

P1125 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.

When P1125 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

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 electric throttle control system on Nissan and Infiniti vehicles uses a tandem throttle position sensor, two sensor elements built into the throttle body that report the throttle plate angle to the Engine Control Module (ECM) as a pair of complementary signals. DTC P1125 sets when the ECM detects a fault or an implausible relationship between the two tandem throttle position sensor signals, such as the two no longer agreeing within the expected range as the plate moves. Because the ECM relies on the redundancy of both signals to trust the throttle position, a single failed sensor element, ...

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