P205EReductant Tank Temperature Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P205E marks a DEF tank temperature that changes faster than any real tank could. GM describes two versions: the 2018 diesel table (1.6L Cruze, 2.8L Colorado) checks whether the signal's time evolution is plausible and fails after 8 out of 10 samples taken every 500 ms, provided no electrical fault of the sensor is present; the 2025 DEF controller flags readings that jump beyond 4 °C within ten values in three of nine checks, Type A. FCA used P205E on the 2013 Ram 2500/3500 with the 6.7L Cummins and released new PCM software (18-057-15 Rev. A) because the code set when the engine block heater was plugged in, and many later Ram updates list it too. A stored P205E without other codes therefore points to software or a loose contact. Steady faults are P205C and P205D.
- What you may notice
- MIL, often after cold starts
- Jumping tank temperature in live data
- Likely causes
- LikelyEngine control software, fixed by reflash (FCA 6.7L)
- PossibleLoose or corroded contact at the tank connector
- RareBlock heater use causing a fast temperature change
- 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: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.