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Good on the resistor.
Aside from the need to periodically reset the codes, is the IMA system behaving normally, and where does the SoC gage stay most of the time?
P1600 is the generic IMA code, and P1449 is a deteriorated pack code and is likely a symptom of the low voltages you observed or an imbalance at the stick-pair taps.
As the pack is cycled, it may improve. I recommend a 12V reset and idle charge to full SoC. If it won't charge at idle. rev it to to 3500 and hold. If it charges there, back off the rpm to the lowest it will charge at and hold it there until full SoC. You might repeat this procedures up to 3 times consecutively. You know the car has fully charged the battery when the charging terminates almost immediately (within a minute or so) and the SoC gauge climbs to full.
Steve
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