P2C72Hybrid/EV Electronics Cooling System Performance
- 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
- P2C72 says the coolant loop serving the hybrid or EV power electronics (inverter, DC/DC converter, often the charger) does not cool as expected. CARB requires a functional check of inverter cooling performance where feasible, on top of the circuit checks of pump and sensors. No manufacturer documents P2C72 publicly. The closest documented code is P0A93: Hyundai traced it on the 2011 Sonata Hybrid to the electric water pump, with a hybrid warning, no EV mode and weak acceleration (bulletin 14-HC-001). A Hyundai patent shows one way to judge the loop: with the car at rest a fixed pump output is applied, and an impeller turning faster than the reference reveals low coolant. Leaks, air, a weak pump, a clogged radiator or a failed fan are typical. Power is limited to protect the electronics.
- What you may notice
- Hybrid system warning and MIL
- Reduced power, no EV mode, especially in heat or under load
- Inverter over-temperature codes stored as well
- Likely causes
- LikelyLow coolant level or leak in the electronics loop
- PossibleAir trapped in the loop after service
- PossibleElectronics coolant pump delivering too little flow
- RareClogged low-temperature radiator or failed cooling fan
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.