P1431 Hybrid Battery Pack - Overheating
What does P1431 mean on a Honda?
P1431 — Hybrid Battery Pack - Overheating. This Honda-enhanced code applies to Insight, Civic Hybrid.
Common causes of P1431
- Failed IMA battery cooling fan
- Blocked battery cooling intake duct or filter
- Aged modules running hot under assist load
- Failed battery temperature sensor reading low
- Debris packed in the cooling fan housing
How to fix P1431
- Check IMA battery cooling fan operation with an HDS scan tool
- Clear the intake duct and fan housing of dust and debris
- Monitor individual module temperatures under assist and regen
- Test the battery temperature sensors against actual pack temperature
- Replace the cooling fan or battery pack as testing indicates