Code result
P2C86
Hybrid/EV Battery Voltage Internal Isolation Warning
High severity
What it means
The hybrid control module detects an internal isolation warning inside the high-voltage battery pack. Pre-failure indicator for cell or busbar insulation.
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 insulation aged
highOne of the most commonly reported causes for this code — check this first.
Busbar approaching housing
mediumA plausible cause — test and verify before replacing parts.
Pack cell imbalance approaching service threshold
lowLess common, but worth ruling out after the more likely causes.
Related help
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