P274DTransmission Fluid Temperature Sensor C Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P274D is set when the sensor C signal climbs above its highest permitted value. On a thermistor supplied with 5 V via a resistor, that happens when the circuit opens – a broken wire, a corroded or unplugged connector – or when the signal line touches a voltage source; the display would then show fluid colder than any real climate produces. No manufacturer documents P274D publicly. For the main sensor, Ford's 2012 strategy uses above 4.6 V, and GM's 2023 dual-clutch module above 4745 mV for its sump sensor, both as electrical limits rather than temperatures. Until the fault is cleared the transmission may keep a cold-fluid strategy with delayed converter lock-up or more cautious clutch control.
- What you may notice
- Warning lamp
- Temperature C shows an extremely cold value
- Late converter lock-up or cautious shifting
- Likely causes
- LikelyOpen circuit in sensor C lead or connector
- PossibleSignal lead shorted to voltage
- RareSensor C open internally
- 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.