P274ATransmission Fluid Temperature Sensor C Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Needs a drive cycle to confirm a fix
- How the car detects it
- P274A is the general circuit code for a third transmission fluid temperature sensor, labelled C. Few gearboxes carry three fluid sensors, and no manufacturer publicly documents which measuring point C stands for or what limits apply to P274A. CARB obliges the module to detect broken circuits and readings outside the possible span on such inputs. By analogy with the main sensor, the module watches a thermistor fed through a pull-up resistor and stores this code when the circuit fails without stating whether it is shorted or open; makers that split the fault use P274C/P274D. A substitute value from another sensor normally keeps the car drivable, though temperature-dependent adaptation and protection functions may be restricted.
- What you may notice
- Warning lamp
- Implausible value for temperature C on the scan tool
- Restricted adaptation or protection functions
- Likely causes
- LikelyConnector or lead to sensor C damaged or corroded
- PossibleSensor C failed electrically
- RareControl module input stage 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.