OBD-II code · Powertrain (generic)
P0E12 Hybrid/EV Battery Pack Coolant Heater A Control Circuit/Open
The HV battery pack coolant heater A reports a control circuit/open condition. Battery preheating may be impaired in cold weather.
Is it safe to drive with P0E12?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyOpen in heater control wire
- PossibleOpen heater element
- Less likelyPin pushed back out of connector body
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
- Hv Battery Pack Coolant Heater A, Wiring Harness, Bms
Related codes
- P0E16Hybrid/EV Battery Pack Coolant Heater B Control Circuit/Open
- P0E0FGenerator Inverter Power Supply A Circuit/Open
- P0E10Generator Inverter Power Supply A Circuit Low
- P0E11Generator Inverter Power Supply A Circuit High
- P0E13Hybrid/EV Battery Pack Coolant Heater A Control Circuit Low
- P0E14Hybrid/EV Battery Pack Coolant Heater A Control Circuit High
- P0E15Hybrid/EV Battery Pack Coolant Heater A Control Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.