P2C8CDC/DC Converter Temperature Sensor D Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2C8C reports a general fault in the circuit of the fourth temperature sensor of a DC/DC converter, after sensors A, B and C (P0C38, P0C3D, P0E58). Where sensor D sits inside the converter is up to each maker. That such a fourth sensor exists in practice is shown by FCA: the 2021 Ram 1500 with the 3.6 L eTorque mild hybrid watches converter sensors 1, 2, C and D, yet bulletin 08-037-21 lists only the plausibility code P2C8D for sensor D. No manufacturer documents P2C8C publicly. The code fits a signal the controller recognises as unusable but cannot sort into too low, too high or implausible. CARB requires circuit checks on hybrid input components. Without this reading the controller normally reduces converter output, which can weaken support for the 12 V system.
- What you may notice
- MIL or hybrid system warning
- Converter output limited, 12 V charging voltage may drop
- Likely causes
- PossibleSensor connector or wiring damaged or corroded
- PossibleTemperature sensor D in the converter defective
- RareSensor reference or evaluation circuit inside the converter faulty
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.