P2C3C code meaning
Cylinder Head Temperature Sensor B Circuit Intermittent/Erratic
Powertrain system Generic code P2Cxx codes Check engine light
What P2C3C means
P2C3C is stored when the head temperature signal of sensor B drops out briefly or jumps in steps that no mass of hot metal could follow, while the samples on their own may still lie within the valid window. Loose terminals, a wire that touches ground only over bumps or with engine movement, corrosion in the plug and a cracked thermistor are the usual culprits. No manufacturer publicly documents P2C3C; Ford's bulletins for this sensor family deal with P2C38 and P2C39 and point to PCM software. California rules require engine component temperature sensors used for emission control to be monitored much like the coolant sensor. Wiggling harness and plug while watching live data is the most revealing check. A fault that stays low or high stores P2C3A or P2C3B instead.
P2C3C at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2C3C
- Check engine light that comes and goes
- Jumping head temperature B in live data
- Occasional fan runs or brief warnings without real overheating
Common causes of P2C3C
- Most likelyLoose or spread terminal in the sensor B connector
- PossibleHarness rubbing on engine parts and shorting only at times
- PossibleCorrosion in the plug
- Less likelyCracked sensor element
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder head temperature sensor bWiring harnessECM
What each part of P2C3C means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| 3C | The exact fault in that area. |
What to do next
- Note P2C3C 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 P2C3C
What does P2C3C mean?
P2C3C means "Cylinder Head Temperature Sensor B Circuit Intermittent/Erratic". P2C3C is stored when the head temperature signal of sensor B drops out briefly or jumps in steps that no mass of hot metal could follow, while the samples on their own may still lie within the valid window. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C3C?
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 P2C3C fail an emissions test?
Yes, it can. P2C3C is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2C3C to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2C3C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.