P274C code meaning
Transmission Fluid Temperature Sensor C Circuit Low
Powertrain system Generic code P27xx codes Check engine light
What P274C means
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.
P274C 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 P274C
- Warning lamp
- Temperature C shows an extremely hot value
Common causes of P274C
- Most likelySignal lead of sensor C shorted to ground
- PossibleInternal short in sensor C
- Less likelyControl module input 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 P274C 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. |
| 4C | The exact fault in that area. |
What to do next
- Note P274C 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 P274C
What does P274C mean?
P274C means "Transmission Fluid Temperature Sensor C Circuit Low". P274C indicates that the sensor C signal has fallen below the lowest value the module accepts. It is a generic code, so it means the same on every make.
Is it safe to drive with P274C?
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 P274C fail an emissions test?
P274C 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 P274C to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P274C 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.