Code result
P0AFB
Hybrid/EV Battery System Voltage High
High severity
What it means
The HV battery system voltage exceeds the expected window. Charging overvoltage 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
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