What are the common causes of P0C3C?

A sensor A connector losing contact. Chafed sensor A wiring in the harness. Corrosion or water in the sensor A connector. Voltage swings in the electrical system.

Road test and watch DC/DC converter temperature sensor A. Wiggle test the sensor A connector and harness. Inspect the connector for corrosion or water. Check battery voltage and charging. Replace sensor A if the signal breaks up. Clear the code and retest.

P0C3C

DC/DC Converter Temperature Sensor A Intermittent/Erratic

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

What it means

P0C3C means DC/DC Converter Temperature Sensor A Intermittent/Erratic.

Where it lives

For P0C3C, the part to look at first is the sensor named here.

Check these first

A sensor A connector losing contact
Chafed sensor A wiring in the harness
Corrosion or water in the sensor A connector
Voltage swings in the electrical system

What to do next

Road test and watch DC/DC converter temperature sensor A
Wiggle test the sensor A connector and harness
Inspect the connector for corrosion or water
Check battery voltage and charging
Replace sensor A if the signal breaks up
Clear the code and retest

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Updated

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