OBD-II code · Powertrain (generic)
P0E18 Hybrid/EV Battery Pack Coolant Heater B Control Circuit High
The HV battery pack coolant heater B reports a control circuit high condition. Battery preheating may be impaired in cold weather.
Is it safe to drive with P0E18?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to B+
- PossibleElement open
- Less likelyConnector pins corroded - high contact resistance
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 B, Wiring Harness, Bms
Related codes
- P0E14Hybrid/EV Battery Pack Coolant Heater A Control Circuit High
- P0E15Hybrid/EV Battery Pack Coolant Heater A Control Performance
- P0E16Hybrid/EV Battery Pack Coolant Heater B Control Circuit/Open
- P0E17Hybrid/EV Battery Pack Coolant Heater B Control Circuit Low
- P0E19Hybrid/EV Battery Pack Coolant Heater B Control Performance
- P0E1AHybrid/EV Battery Pack Coolant Pump B Control Circuit/Open
- P0E1BHybrid/EV Battery Pack Coolant Pump B Control Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.