P0C41DC/DC Converter Temperature Sensor B Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C41 concerns a reading from DC/DC converter temperature sensor B that jumps or briefly drops out while it mostly remains inside the valid range. A converter heat sink changes temperature slowly, so abrupt steps indicate a signal problem rather than real heating. No manufacturer documents P0C41 publicly. GM's 2019 hybrid tables show the usual method on the battery coolant thermistor: the controller adds the absolute differences of ten consecutive 100 ms samples and counts a failure when the sum exceeds 64 °C, setting the code after 4 s within a 5 s window. CARB requires hybrid component inputs to be monitored for such faults. Typical culprits are a loose terminal, moisture or vibration damage. Unlike P0C3F and P0C40, the fault can disappear between checks.
- What you may notice
- Hybrid or EV warning that comes and goes
- Short interruptions of 12 V charging
- Likely causes
- LikelyLoose terminal or moisture at the converter connector
- PossibleHarness chafed or cracked by vibration
- RareIntermittent contact inside the converter
- 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.