P274A code meaning
Transmission Fluid Temperature Sensor C Circuit
Powertrain system Generic code P27xx codes Check engine light
What P274A means
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.
P274A at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P274A
- Warning lamp
- Implausible value for temperature C on the scan tool
- Restricted adaptation or protection functions
Common causes of P274A
- Most likelyConnector or lead to sensor C damaged or corroded
- PossibleSensor C failed electrically
- Less likelyControl module input stage faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Trans fluid temp sensor cWiring harness
What each part of P274A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 4A | The exact fault in that area. |
What to do next
- Note P274A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P274A
What does P274A mean?
P274A means "Transmission Fluid Temperature Sensor C Circuit". P274A is the general circuit code for a third transmission fluid temperature sensor, labelled C. It is a generic code, so it means the same on every make.
Is it safe to drive with P274A?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P274A fail an emissions test?
P274A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P274A to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P274A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.