P0C3E code meaning
DC/DC Converter Temperature Sensor B Range/Performance
Powertrain system Generic code P0Cxx codes Check engine light
What P0C3E means
P0C3E flags DC/DC converter temperature sensor B as electrically valid but implausible, for instance when it disagrees with sensor A or with what the converter load should produce. FCA uses it on the 2021 Ram 1500 with the 3.6 litre eTorque mild hybrid under the name temperature sensor 2 performance. Bulletin 08-037-21 reflashes the hybrid control processor and changes P0C3E, together with P0C39 for sensor 1, from a two-trip to a one-trip code, so one failed test can light the MIL. CARB requires rationality checks for converter inputs. Typical causes are a drifting element, poor thermal contact or outdated software. Circuit faults of sensor B are reported as P0C3D, P0C3F or P0C40; a converter that is really too hot sets P0D32 instead.
P0C3E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C3E
- MIL, after one trip with updated Ram software
- Mild hybrid assist or 12 V supply reduced
Common causes of P0C3E
- PossibleOutdated hybrid control software (Ram 1500 eTorque, bulletin 08-037-21)
- PossibleSensor B drifting or with poor thermal contact
- Less likelyUneven converter cooling making sensors A and B disagree
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Dcdc converter temp sensor bWiring harnessDcdc converter
What each part of P0C3E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 3E | The exact fault in that area. |
What to do next
- Note P0C3E 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 P0C3E
What does P0C3E mean?
P0C3E means "DC/DC Converter Temperature Sensor B Range/Performance". P0C3E flags DC/DC converter temperature sensor B as electrically valid but implausible, for instance when it disagrees with sensor A or with what the converter load should produce. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C3E?
Drive gently and only to a workshop. With P0C3E the car can go into limp mode (reduced power) to protect itself.
Will P0C3E fail an emissions test?
Yes, it can. P0C3E 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 P0C3E to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P0C3E 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.