P273FTransmission Fluid Temperature Sensor B Over Temperature Condition
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P273F is a condition code, not a wiring fault: sensor B delivers a valid reading, but that reading lies above the overheating limit the calibration allows. No manufacturer publishes P273F or its threshold. The analogous code for sensor A is P0218; Saab's Aisin automatic, for instance, sets it once the fluid stays above 170 °C for over 10 s. Where sensor B measures the oil leaving the cooler, as on GM and Ford dual-clutch units, a high value hints that the cooler itself is no longer removing heat. Typical reactions are a warning message, reduced torque or an altered shift and clutch strategy. Look for towing or track use, low fluid, a blocked cooler or a failed cooler valve before suspecting the sensor.
- What you may notice
- Transmission overheating message
- Reduced torque or changed shift pattern
- Burnt-smelling or darkened fluid
- Likely causes
- LikelySustained high load – towing, track use, long climbs
- PossibleFluid cooler clogged or cooler valve not opening
- PossibleFluid level low or fluid aged
- RareSensor B reading too hot while still in range
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.