Another update about my parents' Civic Hybrid.
Last time I mentioned it was recalibrating every time I drove it -- I took a gentle 100 km highwy trip with my parents since then, and it did 6 recals on the journey! So in the interim, I prepared my dad for the likelihood that replacement battery pack #2 was probably on its way out.
Last week, the car lit the check engine light. He took it in to the dealer who reported code P0A7F on the bill (no charge). They "reprogrammed" the computer, reset the CEL and said everything tested A-OK. I thought, possibly this car was missed when Honda issued an IMA code update that was meant to prolong IMA battery life?
But a little research indicates P0A7F is a Honda-specific code:
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this engine fault code is the golden key that is necessary to get honda to replace the battery - Source
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Honda is replacing my Battery free of charge!!!!! - Source
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P0A7F One of the blocks in the battery pack has deteriorated: its dynamic resistance is too high (1) [...] it is a valid code and is even in the Honda Service Manual. It is an IMA DTC code for the condition of the battery - Source
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I told my dad I was skeptical the reprogram would fix the problem, but I'd take it for a drive and see if it was still doing recals.
Sure enough, it started to recal within a couple of blocks, and within 5 minutes both the CEL and IMA lights came lit up. Interestingly, all the IMA hybrid functions seemed to keep working -- assist, regen & auto-stop.
So... I made another appointement at the dealer (for tomorrow) and will report back.