Code Definition

P00B3 — Radiator Temperature Sensor Signal Low

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

About P00B3

P00B3 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 P00B3 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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 P00B3 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 fault code P00B3 is set when the Engine Control Module (ECM) detects a signal from the radiator temperature sensor that is lower than the expected range. This indicates that the sensor is transmitting a reading that is abnormally low, potentially pointing to a sensor malfunction or an issue within the sensor circuit. A low signal can be caused by a variety of factors, including a faulty sensor, damaged wiring, or poor electrical connections. The radiator temperature sensor is essential for monitoring coolant temperature; a low signal may result in the ECM misinterpreting the engine's cooli...

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