P0E15
Hybrid/EV Battery Pack Coolant Heater A Control Performance
Generic OBD-II
Real-world scan data
Seen in
29
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check and repair any wiring or connection issues related to the hybrid/EV battery pack coolant heater control circuit.
- Inspect and replace any faulty control circuit components, such as relays, fuses, or sensors.
- Verify and rectify any cooling system malfunctions that may be causing the control circuit/open issue, such as a faulty coolant pump or a low coolant level.
- If all other solutions fail, consider replacing the hybrid/EV battery pack coolant heater unit itself.
Common causes
Most likely first
- Faulty coolant heater control circuit
- Malfunctioning coolant heater relay
- Issue with the coolant heater temperature sensor
- Faulty wiring or connection in the coolant heater control circuit
How to diagnose & fix
Work through it in order
- Battery not reaching operating temperature
- Loss of power or reduced performance
- Illuminated warning Light
Read & clear P0E15 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.