OBD-II code · Powertrain (generic, extended)
P2C66 Hybrid/EV Electronics Coolant Pump A Underspeed
The hybrid electronics coolant pump A runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high or supply voltage low.
Is it safe to drive with P2C66?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyMechanical load increased
- PossibleSupply voltage low under load
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Hybrid Electronics Coolant Pump A, Power Electronics Coolant Loop
Related codes
- P2E47Hybrid/EV Electronics Coolant Pump B Underspeed
- P2C63O2 Sensor Pumping Current Trim Circuit Low Bank 1 Sensor 3
- P2C64O2 Sensor Pumping Current Trim Circuit High Bank 1 Sensor 3
- P2C65O2 Sensor Out of Range During Deceleration Bank 1 Sensor 3
- P2C67Hybrid/EV Electronics Coolant Pump A Overspeed
- P2C68Hybrid/EV Electronics Coolant Pump A Stuck/Stalled
- P2C69Drive Motor "A" Phase X Current
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.