OBD
P0C31
Inverter B Cooling System Performance
What it means
P0C31 means Inverter B Cooling System Performance.
Check these first
- Low coolant in the inverter B cooling system
- A blockage in the inverter B coolant path
- A failed inverter B coolant pump
- A cooling temperature sensor reading wrong
What to do next
- Read the inverter B cooling temperature on a scan tool
- Check inverter B coolant level
- Check the coolant path for a blockage
- Test the inverter B coolant pump
- Replace the inverter B coolant pump if it tests bad
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.