OBD-II code · Powertrain (generic)

P0C3B DC/DC Converter Temperature Sensor A High

The ECM detects a high fault on the dc/dc converter temperature sensor a. Reading cannot be used reliably for control.

Is it safe to drive with P0C3B?

The car may go into limp mode (reduced power). Get it diagnosed before a long trip.

Common causes

  • Most likelySignal wire shorted to B+
  • PossibleOpen sensor

Repair at a glance

Difficulty
Easy
DIY friendly
Best left to a mechanic
Typical labour
0.5–3 h
Emissions test
Usually unaffected
Parts involved
Dcdc Converter Temp Sensor A, Wiring Harness, Dcdc Converter

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.