OBD-II code · Powertrain (generic)
P0AF8 Hybrid/EV Battery System Voltage
The hybrid control module detects a generic fault on the HV battery system voltage. Cell-group voltage monitoring is the foundation of HV battery safety — drift here triggers contactor opening, charge inhibit, and reduced power to protect the pack.
Is it safe to drive with P0AF8?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCell imbalance
- PossibleSense circuit fault
- Less likelyGround point with elevated 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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–16 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery, Bms
Related codes
- P0AF5Drive Motor Inverter Temperature Sensor B Circuit High
- P0AF6Drive Motor Inverter Temperature Sensor B Circuit Intermittent/Erratic
- P0AF714 Volt Power Module Internal Temperature Too High
- P0AF9Hybrid/EV Battery System Voltage Unstable
- P0AFAHybrid/EV Battery System Voltage Low
- P0AFBHybrid/EV Battery System Voltage High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.