P0AA7 fault code: what it means

P0AA7: Outlander PHEV drive battery voltage isolation sensor circuit fault. EV system warning likely; needs HV-qualified diagnosis.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

isolation monitoring circuit in battery pack
high-voltage harness or connector
battery management unit

P0AA7 by make

Mitsubishi

Outlander PHEV drive battery voltage isolation sensor circuit fault. EV system warning likely; needs HV-qualified diagnosis.

Usual causes: isolation monitoring circuit in battery pack; high-voltage harness or connector; battery management unit

Toyota

Hybrid battery voltage isolation sensor circuit fault: the circuit that watches for high-voltage leakage to the body has failed.

Usual causes: battery ECU isolation-detection circuit fault; sensor wiring fault

What the repair usually costs

EV battery pack replace used / refurbished (Leaf 24-30 kWh)NZ$4,730–NZ$10,170 · A$5,270–A$10,550
EV battery pack replace or upgrade (Leaf 40 kWh, used or new cell)NZ$9,900–NZ$16,920 · A$10,240–A$17,730
EV battery pack replace new aftermarket (Leaf 50-62 kWh)NZ$15,510–NZ$20,950 · A$16,270–A$22,240
EV battery pack replace (Tesla / Kona / Ioniq / MG / BYD, genuine)NZ$22,110–NZ$47,100 · A$21,240–A$45,230

Not sure what P0AA7 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.