Code Definition

P0189 — Fuel Temperature Sensor B Circuit Intermittent

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

About P0189

P0189 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.

When P0189 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.

Because P0189 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

The P0189 fault code is set when the Engine Control Module (ECM) detects intermittent readings or signal disruptions in the circuit of the Fuel Temperature Sensor B. This sensor plays a crucial role in measuring the temperature of the fuel in the vehicle, which influences important factors like fuel density, vapourization, and the efficiency of the combustion process. Intermittent circuit issues can be caused by loose or corroded connections, damaged wires, or a faulty sensor. These intermittent signals can result in the ECM receiving erratic data, which may lead to inconsistent engine perform...

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