OBD-II code · Powertrain (generic)
P0AFE Hybrid/EV Battery System Voltage Too Low for Voltage Step Up Conversion
The HV battery system voltage is too low to enable voltage step-up (boost) conversion. DC/DC converter cannot operate.
Is it safe to drive with P0AFE?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyHV battery depleted
- PossibleBattery cells aged
- Less likelyPack cell imbalance approaching service threshold
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–12 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery, Dcdc Step Up Converter
Related codes
- P0AFBHybrid/EV Battery System Voltage High
- P0AFCHybrid/EV Battery Pack Sensor Module
- P0AFDHybrid/EV Battery Pack Temperature Too Low
- P0AFFSystem Voltage Too Low for Voltage Step Down Conversion
- P0B00Electric/Auxiliary Transmission Fluid Pump Motor Phase U Current
- P0B01Electric/Auxiliary Transmission Fluid Pump Motor Phase U Current Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.