P0C3EDC/DC Converter Temperature Sensor B Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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 Typical causes are a drifting element, poor thermal contact or outdated software.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.
- What you may notice
- MIL, after one trip with updated Ram software
- Mild hybrid assist or 12 V supply reduced
- Likely causes
- PossibleOutdated hybrid control software (Ram 1500 eTorque, bulletin 08-037-21)
- PossibleSensor B drifting or with poor thermal contact
- RareUneven converter cooling making sensors A and B disagree
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.