P2C66
Hybrid/EV Electronics Coolant Pump A Underspeed
P2C66 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Electronics Coolant Pump A Underspeed. Common causes: cooling pump malfunction, problems with wiring or connectors. Estimated repair cost: $56–167.
Symptoms
- Overheat warning on dashboard
- Hybrid system power reduction
- Cooling pump noises
- Overheating of electronic components
- Check Engine Light Illuminates
Causes
- Cooling pump malfunction
- Problems with wiring or connectors
- Low coolant level
- Faulty relay or fuse
- Problems with the pump control ECU
How to Fix
- Check the level and condition of the coolant
- Diagnose the electrical circuit of the pump
- Check fuses and pump relays
- Test or replace the cooling pump
- Check error codes in the hybrid system ECU
Related codes
Error P2C66 by Vehicle Brand
FAQ
What does the P2C66 code mean?
P2C66 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Electronics Coolant Pump A Underspeed
What causes a P2C66 error code?
The most common causes of P2C66 include: Cooling pump malfunction; Problems with wiring or connectors; Low coolant level; Faulty relay or fuse.
How do I fix a P2C66 diagnostic trouble code?
To fix P2C66: Check the level and condition of the coolant. Diagnose the electrical circuit of the pump. Check fuses and pump relays. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2C66?
Do not drive — repair immediately
How much does it cost to fix P2C66?
The estimated repair cost for P2C66 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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