P275B code meaning
Transmission Fluid Temperature Sensor D Circuit Range/Performance
Powertrain system Generic code P27xx codes Check engine light
What P275B means
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.
P275B at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P275B
- Warning lamp after repeated detection
- Temperature D lags behind or deviates from the other readings
Common causes of P275B
- Most likelySensor D thermistor aged or slow
- PossibleAdded resistance in a contact
- Less likelySludge or deposits on the sensor tip
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Trans fluid temp sensor d
What each part of P275B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 5B | The exact fault in that area. |
What to do next
- Note P275B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P275B
What does P275B mean?
P275B means "Transmission Fluid Temperature Sensor D Circuit Range/Performance". P275B is the rationality code for sensor D: the circuit is electrically sound, yet the value does not behave like real fluid temperature. It is a generic code, so it means the same on every make.
Is it safe to drive with P275B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P275B fail an emissions test?
P275B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P275B to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P275B clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.