P274CTransmission Fluid Temperature Sensor C Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P274C indicates that the sensor C signal has fallen below the lowest value the module accepts. With the negative-temperature-coefficient thermistors normally used for fluid temperature, a low voltage corresponds to very hot fluid, so the usual culprit is a signal lead touching ground or a sensor with an internal short; real heat rarely drives the reading that far. No manufacturer publishes P274C with a threshold. As orientation, Ford's 2012 strategy flags its main sensor below 0.05 V held for 5 to 12 s. Note that some makers, such as Mitsubishi on sensor B, define low by the computed temperature instead, which reverses the meaning. The module then discards C and works with a replacement value.
- What you may notice
- Warning lamp
- Temperature C shows an extremely hot value
- Likely causes
- LikelySignal lead of sensor C shorted to ground
- PossibleInternal short in sensor C
- RareControl module input faulty
- 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.