P2CA5DC/DC Converter Temperature Sensor E Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2CA5 is the general circuit fault of the fifth temperature sensor in a DC/DC converter, the one carrying letter E. Converters measure several hot spots because each part heats differently: a Hyundai patent for a hybrid high-side converter places separate sensors on the inductor and on both IGBT switches, high side and low side, and changes the switching frequency when their readings drift apart. No manufacturer documents P2CA5 publicly; the highest letter found in a bulletin is sensor D on the 2021 Ram 1500 eTorque (FCA 08-037-21). The code fits a signal that is unusable but cannot be classed as low, high or implausible. CARB requires circuit checks for such hybrid inputs. Expect the converter to be derated, which can strain the 12 V battery.
- What you may notice
- Hybrid or electrical system warning and MIL on
- DC/DC converter output limited, 12 V battery discharges
- Likely causes
- LikelyLoose, corroded or pushed-out terminal at the converter connector
- PossibleTemperature sensor E inside the converter failed
- RareEvaluation circuit of the converter control board faulty
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.