OBD Codes List

Diagnostic reference · P0C3D

P0C3D

DC/DC Converter Temperature Sensor B Circuit

System
Powertrain control (P code)
Lamp
Check Engine Light
Category
Powertrain - Fuel/Air Metering

What it means

P0C3D means DC/DC Converter Temperature Sensor B Circuit.

Where it lives

For P0C3D, the circuit described runs through the sensor. The description of P0C3D reports a fault at the sensor.

Check these first

  • A failed DC/DC converter temperature sensor B
  • An open or short in the sensor B wiring
  • Corrosion or water in the sensor B connector
  • A hybrid battery pack issue dragging the converter

What to do next

  1. Read DC/DC converter temperature sensor B on a scan tool
  2. Inspect sensor B and its connector for damage
  3. Test the sensor B circuit for an open or short
  4. Check the hybrid battery pack
  5. Replace sensor B if the circuit tests good
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.