P205DReductant Tank Temperature Sensor A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P205D is the top-of-range fault of the tank's temperature sensor. On voltage-read NTC sensors a high signal looks like extreme cold and typically comes from an open circuit, a lost ground or a short to supply: Ford's 2023 diesels set it above 4.3 V, GM's 2025 DEF controller above 4.75 V (about −40 °C, 0.5 s, Type A), and GM's 2018 diesel table above 60,000 Ω. On the 6.6L LML and 2014 Cruze GM reads a CAN raw value instead, where High means above 1022, i.e. 160 °C or more, the hot side (6 s, Type B). Ford's bulletin 18-2190 for 2011–2015 6.7L Super Duty treats P205D like P205C: new reductant heater and sender assembly plus PCM update. Hino names P205D next to P205B and P205C as a source of wrong DEF temperature input. The low end is P205C.
- What you may notice
- MIL and DEF warning
- Tank heater runs although the tank is warm
- Dosing delayed after start
- Likely causes
- LikelyOpen circuit, unplugged connector or broken ground
- PossibleSensor in the heater/sender assembly open internally
- RareSignal wire shorted to supply voltage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.