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According to the Advanced DTC Troubleshooting .pdf, there are four possible meanings of P1449 for the Insight:
DTC P1449 (72): Battery Module Overheating
DTC P1449 (73): Battery Cell Overheating
DTC P1449 (74): Battery Module Individual Voltage Input Deviation
DTC P1449 (78): Battery Module Deterioration
Representing a few different failure determination schemes for the battery pack. It doesn't much matter which one you have, as they can all be consequences of an imbalanced pack, and your response will be the same. See if it responds to a long soak on a grid charger, do a DIY refurb, or buy a refurbished battery.
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