EV and hybrid code
P0AA6: High voltage isolation fault
How much to fix P0AA6? Typically $110–$800.
Wide range: this job varies a lot. Itemize your quote for a better answer.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $0 | $250 |
| Labor: 1 to 3 hours × $110 to $150 an hour | $110 | $450 |
| Fees: shop supplies, disposal, diagnostics | $0 | $100 |
| Total, rounded | $110 | $800 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
This is the range for the most common fix, high-voltage battery inspection and service. Which repair your car needs depends on a proper diagnosis.
The car checks whether high voltage is leaking out of its sealed wiring and toward the metal body, which would be a shock risk. This code says that check failed. Water in the battery pack or inverter, a damaged cable and a coolant leak are possible causes. The exact trigger varies by make.
- Safe to drive?
- No, get it looked at first
- Most common cause
- Moisture in the battery pack or inverter
Do not keep driving or touch orange cables. Stop safely and have it towed to a hybrid-trained shop.
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What you may notice
- Hybrid or ready light off
- Car will not go into ready mode
- Warning messages
- Loss of power
Common causes, most likely first
- Moisture in the battery pack or inverter
- Damaged high voltage cable
- Failing battery pack
- Coolant leak into a component
- Inverter or motor fault
Check this first
Look for water in the car from a leak or flooding, and do not touch orange cables. Only a trained tech should test this.
Other repairs that sometimes fix P0AA6
| Repair | Typical range, US |
|---|---|
| Hybrid battery replacement | $1,400 to $5,500 |
| Hybrid inverter / converter repair | $1,000 to $4,350 |
| Diagnostic scan (check engine light) | $55 to $250 |
Before you pay
- Ask the shop what test showed this part is the cause, not just that the code appeared.
- Ask for parts and labor listed separately, and for the hours.
- Ask for a written OK before any extra work. Many states require written authorization before repairs.
Got a quote already? Check it against the range. Want to see if your car has a recall tied to this problem? Check recalls by VIN.
Need to read a code yourself? OBD-II scanners on eBay (affiliate link, disclosure).
P0AA6 questions
Can I check it myself?
No. High voltage can cause serious injury or death. Leave it to techs trained and equipped to test hybrid and electric systems, and do not touch any orange cables.
Was it the rain?
It can be. Water getting into the pack or wiring is a known cause, particularly after flooding or a leak in a cargo area. Tell the shop about any water in the car or recent heavy rain.
Is it expensive?
It depends on whether it is a cable, the pack or the inverter. Get the cause identified first, with a written estimate, since the price range from a cable to a pack is very wide.
How much does it cost to fix P0AA6?
The most common fix, high-voltage battery inspection and service, has a typical range of $110 to $800 across the US. It is an estimate built from parts prices and local labor wages, not a quote. Your car and shop change it.
Typical range in 10 metro areas
Only the labor rate changes between cities. Same parts, same hours.
| Area | Typical range, estimate |
|---|---|
| Boston area, Massachusetts | $120 to $880 |
| New York City area | $120 to $850 |
| Los Angeles area, California | $120 to $860 |
| Chicago area, Illinois | $110 to $820 |
| Houston area, Texas | $100 to $790 |
| Dallas-Fort Worth area, Texas | $100 to $790 |
| Phoenix area, Arizona | $110 to $800 |
| Atlanta area, Georgia | $110 to $820 |
| Miami area, Florida | $100 to $800 |
| Seattle area, Washington | $120 to $860 |
Related codes
- P0A0D: High voltage interlock circuit open
- P0A80: Hybrid battery weak or worn out
- P0A78: Drive motor inverter performance problem
More ev and hybrid codes
Code meaning written in our own words. Some codes mean different things on different makes, so check your scan tool or manual. Not a repair shop, estimates only.