P2C72
Hybrid/EV Electronics Cooling System Performance
The hybrid control module detects that the power electronics cooling system does not maintain target temperatures under load. Coolant flow, radiator fouling, or pump output reduced.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Radiator fins fouled - reduced heat rejectionCommon
- Coolant aged - reduced heat capacityPossible
Parts involved
- Hybrid Electronics Coolant Pump A
- Hybrid Electronics Radiator
- Power Electronics Coolant Loop
P2C72 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.