The Lemon Index

Check engine light · Engine codes

P0AA6: Hybrid Battery Voltage System Isolation Fault.

Powertrain · GenericP0AA6
Stop and fix now
What it means

High voltage is leaking somewhere it shouldn't.

How serious

Stop and fix now. Don't put it off. This can affect safety, stall the car or cause expensive damage.

Where a shop starts

Damaged high-voltage cable or part. Then: coolant leak into high-voltage parts; failed AC compressor (on some hybrids).

Owners named P0AA6 in 14 complaints to the U.S. government, most often on the Toyota Prius.

Cars owners report it on

Complaints that name P0AA6, by model. Raw counts, not a failure rate: popular models get more complaints.

Years owners report it on most: 2007 Toyota Prius

The details

What P0AA6 means

High voltage is leaking somewhere it shouldn't. This is a safety fault: get it checked by a hybrid-trained shop.

Can I drive with P0AA6?

Stop and fix now. Don't put it off. This can affect safety, stall the car or cause expensive damage.

79% of the owner complaints that name P0AA6 also say the car warning lights and electrical faults. A complaint can describe more than one problem, so this doesn't prove the code caused it.

Common causes of P0AA6
  • Damaged high-voltage cable or part
  • Coolant leak into high-voltage parts
  • Failed AC compressor (on some hybrids)

A shop should confirm the cause with a scan and tests before replacing parts.

What owners describe
  • Warning lights and electrical faults: 79% of complaints
  • Brakes or ABS act up: 14% of complaints

Share of complaints naming the code whose text also mentions each problem.

Model years that report P0AA6 most

2007 Toyota Prius (2).

Related codes

P0A94 P0A93 P0A80 P0A7F P0A43 P0A0A P0A08

Quick answers

What does P0AA6 mean?

Hybrid Battery Voltage System Isolation Fault. High voltage is leaking somewhere it shouldn't. This is a safety fault: get it checked by a hybrid-trained shop.

Can I drive with P0AA6?

Stop and fix now. Don't put it off. This can affect safety, stall the car or cause expensive damage.

What causes P0AA6?

Damaged high-voltage cable or part; Coolant leak into high-voltage parts; Failed AC compressor (on some hybrids).

Counts: NHTSA owner complaints whose text names P0AA6. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.

Updated · Free to use with credit: Source: The Lemon Index (lemonindex.com). Get the data

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