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Powertrain Problem ID: 963


Active Member
Supporting Member
Feb 20, 2011
Sunnyvale, CA
As I said in my post #8, the probable cause was a momentary drop in the input voltage causing more current to be drawn to maintain the same power level. There was a firmware update (3.5.17) in May, 2010 to improve the timing loop of the charge algorithm to prevent that behavior. Is it possible that the firmware in your car has not been updated since then? Seems unlikely. I would not expect fuses to fail due to age, though.


Jun 3, 2011
Also, I believe those are Class T fuses which are extremely fast acting. Used for high fault current protection. For anyone else looking for replacements they can be bought online for about $50.

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