Quote:
Originally Posted by turquise1
Also, after doing a lot of reading, I thought the capacitors in the GM3 module (which puts the system to sleep) were the problem and replaced them already. I have checked each of the door modules and they are fine too..
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I agree that cold weather will reduce battery performance, however, if the battery is good and meets specs of original battery there shouldn't be a problem starting after one night, even if weather is well below 0. Even though battery is new the first thing I would do is have it load tested.
Since the sleep drain is initially normal I suggest checking drain in cold weather every hour for several hours to see if that changes.
Does your X5 happen to have an engine block or oil pan heater?