Powertrain, generic (extended)

P275B Transmission Fluid Temperature Sensor D Circuit Range/Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Sensor D thermistor aged or slow
Added resistance in a contact
Sludge or deposits on the sensor tip

Symptoms

  • Warning lamp after repeated detection
  • Temperature D lags behind or deviates from the other readings

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

trans fluid temp sensor d

Related codes

P275AP275CP275DP275EP0711

References: law.cornell.edu, gsi.ext.gm.com, mitsubishitechinfo.com.