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On the way back from Tampa to Atlanta, my IMA light came on, so I got to drive like a Metro for the last 150 miles. Not much I could do except take it in to the dealer the next day (under warranty). I got it back after an overnight stay in the shop waiting for a replacement fan, which had apparently died, causing the batteries to overheat.

(I explained this to my roommate with a phrase like "oh, the dealer said my CPU fan died or something and they had to replace it." To which he said, "Dude, your car is way too much 'computer' and not enough 'car' .. heh.. but I digress.)

Anyhow, before this little incident, I had been getting recalibrations to zero SOC fairly regularly (every 400-600 miles or so it seems like it would happen, since about 30,000 miles earlier). After the repair, I have yet to see a recal to zero in the 3,000 miles I've driven since them. However, I have now started noticing recalibrations to maximum SOC instead. Maybe not quite as frequently, but it's a little early to tell (had 3 or 4 of them so far). Has there been an IMA programming change lately that they installed on the sly? Not that I'm complaining; recalibrations to maximum are MUCH, MUCH less annoying than the opposite -- all "max SOC" does is wear out the brakes a little bit more, since I get no regeneration until I have to use the batteries for a bit, whereas zero SOC can be downright dangerous depending on the situation (and more importantly, whether I've noticed the recal before needing a boost), since the acceleration profile is radically different without any assist.

Anyhow, if there's been an update, I like it. If not, er.. what's going on? Was a failing fan causing all of these recalibrations?
 

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In my case, it was a deteriorating IMA battery causing recals from near zero to the max, in about 5 minutes. Eight recals in 2 weeks. I got new MCM & BCM recently, and the problem persists, so I'm in the process of ordering a slightly used IMA Battery. The IMA light didn't come on until it got bad. The battery became very sensitive to ASST causing rapid reduction in SoC.
- Jim
 
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