P2C86

Hybrid/EV Battery Voltage Internal Isolation Warning

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

Check engine light comes on
A warning message appears on the dashboard
Reduced vehicle power or performance
The car may go into emergency mode
Possible problems with battery charging

Causes

Damaged insulation inside the battery module
Moisture entering the high-voltage compartment
Mechanical damage to the battery
Corrosion of contacts or connections
Insulation monitoring system malfunction

How to Fix

Carry out diagnostics of the high-voltage system
Check battery insulation resistance
Inspect the battery module for damage
Replace damaged battery cells
Repair only from an authorized dealer

Related codes

P2C85 P2C87 P0AA6