Code Definition

P205D — Reductant Tank Temperature Sensor Circuit High

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

About P205D

P205D 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 P205D is stored, the module has detected a signal or supply voltage higher 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 P205D 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 Powertrain Control Module (PCM) monitors the reductant tank temperature sensor signal to determine the temperature of the diesel exhaust fluid (DEF, also known as AdBlue) in the SCR system tank. DTC P205D is set when the PCM detects a voltage on the temperature sensor signal circuit that is higher than the calibrated upper threshold for a specified period. The reductant tank temperature sensor is typically a negative temperature coefficient (NTC) thermistor sharing a 5 volt reference from the PCM and providing a voltage that falls as DEF temperature rises, so an open circuit or a short to ...

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