Code Definition

P008F — Coolant Temperature Sensor and Fuel Temperature Sensor Signal Mismatch

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

About P008F

P008F 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 P008F 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 P008F 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 engine coolant temperature sensor and the fuel temperature sensor are both negative temperature coefficient thermistors reporting to the Engine Control Module (ECM), one measuring coolant in the cylinder head or thermostat housing and the other measuring fuel temperature in the rail, the filter housing or the return line. After a long soak with the engine off, both should have equalised with ambient temperature, so the ECM performs a rationality check by comparing the two readings at start up and again once running, since a known relationship exists between them under normal operating cond...

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