P275BTransmission Fluid Temperature Sensor D Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P275B is the rationality code for sensor D: the circuit is electrically sound, yet the value does not behave like real fluid temperature. Published tests on other fluid sensors show what modules look for – a warm-up check (GM's 2025 TCMs expect the main sensor to pass 15 °C within a calibrated time), a stuck-value check and a rate check against impossible jumps, such as Mitsubishi's rejection of 10 °C changes within 80 ms on its dual-clutch sensor B. Which of these a maker applies to D is not documented publicly, and no manufacturer lists P275B. Ageing of the thermistor, a contact with added resistance or oil sludge on the sensor tip can all produce a believable but wrong reading.
- What you may notice
- Warning lamp after repeated detection
- Temperature D lags behind or deviates from the other readings
- Likely causes
- LikelySensor D thermistor aged or slow
- PossibleAdded resistance in a contact
- RareSludge or deposits on the sensor tip
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.