Hi,
The code you have, P0A9C, is an informational code. It doesn't provide specifics other than the battery pack control module (BPCM) has identified a problem within the hybrid circuit. In other words, there is an issue present and the BPCM is setting a light for someone to scan that module for issues. See pic 1 below.
What the dealership should have done (and they may have), is scan the battery pack control module (BPCM) for specific diagnostic codes. That will point us in the direction of the cause. By any chance, did they provide additional codes that may be related?
The two things you mentioned, either the battery or the module may be faulty. However, without knowing specifics, I can't confirm that. If the vehicle had lower mileage, then my first suspect would be the module. But at 120K, it could be the battery or other things.
I believe the module's OEM part number is 05057870AS. They aren't cheap.
Let me know.
Joe
See pic below.
Image (Click to make bigger)
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Wednesday, November 1st, 2023 AT 8:09 PM