Powertrain, generic (extended)

P275C Transmission Fluid Temperature Sensor D Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

P275C reports that sensor D delivers less signal than the module considers possible. Read against an NTC thermistor this means a reading far hotter than the fluid could be, which almost always points to a pinched or melted lead touching ground, or to a short inside the sensor body. P275C is not documented by any manufacturer. As a frame of reference, GM's 2023 dual-clutch TCM judges its sump sensor too low below 200 mV for 500 ms. Mitsubishi shows that the meaning can also be inverted, since its dual-clutch unit sets the sensor B low code at −40 °C or colder. Before replacing parts, unplug the sensor: if the value jumps to the cold end, the fault lies in the sensor, otherwise in the harness.

Likely causes

Pinched or melted lead of sensor D touching ground
Short inside sensor D
Module input faulty

Symptoms

  • Warning lamp
  • Temperature D shows an impossibly hot value

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 dwiring harness

Related codes

P275AP275BP275DP275EP275FP0712

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