P2CA7DC/DC Converter Temperature Sensor E Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2CA7 means the signal of DC/DC converter temperature sensor E is stuck above its upper limit. In a thermistor input fed through a pull-up resistor, an interrupted loop lets the voltage rise to the reference, so a pin pushed out of the connector, a broken conductor or a short to a supply line gives this result. The implied reading would be colder than any real surroundings. No manufacturer documents P2CA7 publicly; the converter sensors named in bulletins stop at letter D. CARB asks for range checks on such hybrid inputs. As a false cold value could hide real heat, the controller treats the temperature as unknown and limits the converter, leaving more of the 12 V load to the battery. P2CA6 is the low-side counterpart.
- What you may notice
- MIL and hybrid or charging warning on
- Implausibly cold converter temperature in live data
- Reduced converter output, 12 V battery charge drops
- Likely causes
- LikelyOpen circuit in the sensor E signal or return line, e.g. pushed-out pin
- PossibleSignal line shorted to a supply voltage
- PossibleThermistor of sensor E broken (open)
- 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: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.