P0AFB
Hybrid/EV Battery System Voltage High
Generic OBD-II
Common symptoms
What you'll notice
- Check the battery voltage and ensure it is within the acceptable range.
- Inspect the battery cables for any signs of damage or corrosion, and clean or replace them if necessary.
- Test the charging system to ensure it is functioning properly, including the alternator and voltage regulator.
- Check for any loose connections or faulty wiring within the hybrid/EV battery system and fix or replace as needed.
- If all else fails, consult a specialized technician or the manufacturer for further guidance and potential repair options.
Common causes
Most likely first
- Faulty hybrid/EV battery control module
- Malfunctioning hybrid/EV battery pack
- Defective hybrid/EV battery cooling system
- Issues with the hybrid/EV battery charging system
- Faulty voltage monitoring sensors
How to diagnose & fix
Work through it in order
- Dashboard warning light illuminates
- Reduced power or hesitation
- Possible overheating of the hybrid/EV battery system
- Decreased fuel efficiency
- Possible malfunctioning of other electronic systems in the vehicle
Read & clear P0AFB yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.