Code Definition

P00B6 — Radiator Temperature and Coolant Temperature Sensor Mismatch

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

About P00B6

P00B6 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 P00B6 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 P00B6 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 P00B6 is set when the Engine Control Module (ECM) detects a discrepancy between the readings from the radiator temperature sensor and the engine coolant temperature sensor. This mismatch indicates that the two sensors, which should typically provide correlated temperature readings, are reporting significantly different temperatures. Such discrepancies can be caused by a malfunction in one of the sensors, issues in the sensor circuits, or actual differences in temperature due to cooling system problems. Accurate temperature readings from these sensors are crucial for the ECM to m...

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