Code p0AA6, hybrid battery replacement

Tiny
AABBAABBNN
  • MEMBER
  • 2008 TOYOTA HIGHLANDER
  • AUTOMATIC
P0AA6 hybrid battery voltage system isolation fault. The problem is that when some lamps and they are ABS lamp and other lamps and then the car not working until we program it. I wish you help me out of it. All the best.
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Friday, January 30th, 2015 AT 4:55 AM

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Tiny
KASEKENNY
  • EXPERT
This fault is normally pretty common when the battery itself has failed.

Let's start with some info on this from these guides. Please review this and then we will move on:

https://www.2carpros.com/articles/hybrid-battery-information

https://www.2carpros.com/articles/how-a-hybrid-car-works

This fault is pointing the vehicle's ability to isolate the voltage from the battery from the rest of the vehicle. It is mainly a safety issue when you shut the vehicle off. So when you turn the vehicle off there is a component like a light switch that should disconnect the positive and negative of the high voltage battery so that it is not conducting any current when the engine is off.

This code is telling you that there is still resistance in the circuit meaning it is still connected and this could be a safety issue. This normally means there is a short in a harness, connector, or the battery pack itself.

However, I attached the complete testing for this code and we need to go through this but if you are not familiar with testing a high voltage system safely and have all the safety equipment then I would not attempt this.

Please let us know what questions you have. Thanks
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Sunday, January 3rd, 2021 AT 7:08 AM

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