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2020 FORD F-150
5.0L V8 Coyote•RWD•AUTOMATIC•gas
11 active safety recalls on this vehicle — view recalls
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Repairs420Labor1001Torque8720Fluid18DTC3214Battery2Maintenance0Recalls11
P0AA6critical severityPowertrain

Hybrid Battery Voltage System Isolation Fault

on 2020 Ford F-150 5.0L V8 Coyote · RWD

What this code means

The hybrid control system detects a loss of electrical isolation between the high-voltage battery system and the vehicle chassis. This is a safety concern involving potential high-voltage leakage.

Symptoms

  • Hybrid system warning light
  • Vehicle may not start
  • Reduced or disabled hybrid operation

Common causes

  • Damaged high-voltage wiring insulation
  • Moisture in high-voltage components
  • Faulty battery pack isolation
  • Failed high-voltage component ground

Diagnostic steps

  1. Scan hybrid system codes safely
  2. Inspect high-voltage cables and connectors
  3. Test isolation resistance of HV system
  4. Check for moisture intrusion in components
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