Code result
P0AFA
Hybrid/EV Battery System Voltage Low
High severity
What it means
The HV battery system voltage is below the expected window. Cell-level depletion, cold conditions, or sense fault. 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?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Cell imbalance
highOne of the most commonly reported causes for this code — check this first.
Sense circuit fault
mediumA plausible cause — test and verify before replacing parts.
Ground point with elevated resistance
lowLess common, but worth ruling out after the more likely causes.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P0AFA freeNo credit card required