P2C72 code meaning
Hybrid/EV Electronics Cooling System Performance
Powertrain system Generic code P2Cxx codes Check engine light
What P2C72 means
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.
P2C72 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2C72
- Hybrid system warning and MIL
- Reduced power, no EV mode, especially in heat or under load
- Inverter over-temperature codes stored as well
Common causes of P2C72
- Most likelyLow coolant level or leak in the electronics loop
- PossibleAir trapped in the loop after service
- PossibleElectronics coolant pump delivering too little flow
- Less likelyClogged low-temperature radiator or failed cooling fan
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hybrid electronics coolant pump aHybrid electronics radiatorPower electronics coolant loop
What each part of P2C72 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| 72 | The exact fault in that area. |
What to do next
- Note P2C72 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2C72
What does P2C72 mean?
P2C72 means "Hybrid/EV Electronics Cooling System Performance". P2C72 says the coolant loop serving the hybrid or EV power electronics (inverter, DC/DC converter, often the charger) does not cool as expected. It is a generic code, so it means the same on every make.
Is it safe to drive with P2C72?
Drive gently and only to a workshop. With P2C72 the car can go into limp mode (reduced power) to protect itself.
Will P2C72 fail an emissions test?
Yes, it can. P2C72 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2C72 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2C72 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.