P0C40
DC/DC Converter Temperature Sensor B High
The ECM detects a high fault on the dc/dc converter temperature sensor b. Reading cannot be used reliably for control.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to B+Common
- Open sensorPossible
Parts involved
- Dcdc Converter Temp Sensor B
- Wiring Harness
- Dcdc Converter
P0C40 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.