P0C38DC/DC Converter Temperature Sensor A 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
- The DC/DC converter steps the high-voltage battery down to the 12 V system and replaces the alternator in hybrids and EVs. Its power stage carries temperature sensors so the controller can derate before the semiconductors overheat. P0C38 is the general circuit code for sensor A. Hyundai documents it on the 2027 Palisade Hybrid as P0C381C (failure type 1C, voltage out of range): the hybrid warning light comes on after the car has been parked for a long time, and bulletin 26-01-071H and campaign 9D8 cure it with an HPCU software update that improves the detection logic, so the sensor itself is usually fine. CARB requires the converter's inputs to be monitored as comprehensive components. Low, high and erratic signals have their own codes P0C3A to P0C3C.
- What you may notice
- Hybrid system warning light
- 12 V charging reduced or switched off
- Code appearing after the car has stood for a long time
- Likely causes
- LikelyControl unit software misjudging the sensor after long parking (Hyundai Palisade Hybrid)
- PossibleFault in the circuit of sensor A inside the converter or power control unit
- RareInternal fault of the DC/DC converter requiring replacement
- 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 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.