OBD-II code · Powertrain (generic)
P0C73 Hybrid Battery Pack Cooling Pump Performance
BMS detects insufficient flow from the battery cooling pump despite commanded operation, indicating mechanical degradation or air pocket.
Is it safe to drive with P0C73?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPump worn
- PossibleAir trapped in cooling circuit
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Battery Cooling Pump, Coolant Circuit
Related codes
- P0C70Hybrid/EV Battery Temperature Sensor C/D Correlation
- P0C71Hybrid/EV Battery Temperature Sensor D/E Correlation
- P0C72Hybrid/EV Battery Temperature Sensor E/F Correlation
- P0C74Motor Electronics Coolant Pump B Control Performance
- P0C75Hybrid/EV Battery System Discharge Time Too Short
- P0C76Hybrid/EV Battery System Discharge Time Too Long
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.