P2CA9DC/DC Converter Temperature Sensor F 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
- P2CA9 is the general fault code for the circuit of the sixth DC/DC converter temperature sensor, letter F. Which component this sensor watches is left to the manufacturer. No manufacturer documents P2CA9 publicly; the converter sensors visible in bulletins end at D (Ram 1500 eTorque, FCA 08-037-21). Why a converter has several measuring points is shown by a Hyundai patent: inductor and both IGBTs are measured separately so that the controller can balance how hot they get. The code serves for input faults that cannot be sorted into low, high or implausible. CARB demands circuit monitoring of hybrid inputs. A derated converter can gradually drain the 12 V battery; sensor E's general circuit code is P2CA5.
- What you may notice
- MIL and hybrid system warning on
- Converter output limited, 12 V voltage may sag
- Likely causes
- LikelyDamaged harness or poor contact in the sensor F circuit
- PossibleTemperature sensor F inside the converter failed
- RareInput stage on 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.