What it means
The third transmission fluid temperature sensor reports an over-temperature condition.
At a glance
- Usually lights the check-engine light
How it works
Transmission fluid temperature sensor C monitors fluid temperature at its sensing point, and the transmission control module uses that reading to manage operation and protect the transmission. P274F indicates that sensor C has reported an over-temperature condition, which may reflect genuinely hot fluid from restricted cooling, low fluid, or sustained heavy load.
Common causes
Most likely first.
- Restricted transmission fluid cooler
- Sustained heavy load such as trailer towing
- Low transmission fluid level
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Save freeze-frame data and compare sensor C's temperature with other available readings, noting load, speed, and recent towing.
- If the transmission is hot or shifting abnormally, stop in a safe place and let it cool before further checks.
- Check the transmission fluid level and condition using the vehicle's specified procedure.
- Inspect the transmission cooler and lines for damage, blockage, or restricted airflow.
- If the temperature indication seems inconsistent, compare sensor C's live data with other temperature readings and test its circuit.
Common fixes
- Correct a low transmission fluid level after checking for leaks and following the specified fill procedure.
- Clear debris or repair a restriction in the transmission cooler or its lines.
- Reduce sustained heavy load and allow the transmission to cool.
- Repair sensor C's circuit or replace the sensor if its reading is inaccurate.
Can I keep driving?
Stop safely and allow the transmission to cool if the warning is active, and avoid towing or strenuous driving. Continued overheating can damage fluid and internal transmission parts; do not continue if it slips or loses drive.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.