Thread: SMG Problem?
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Old 10-31-2012, 08:12 AM   #8
roadtrip1098
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Join Date: Aug 2011
Location: Winslow, ME
Posts: 356
My Ride: 04 M3 SMG LSB
An aftermarket stereo system wont cause any direct issues with the SMG, but you have to keep in mind that the aftermarket systems draw a lot of juice and if the battery and altenator can't keep up with it - that will cause SMG issues. For one the pump will prime slower and because it doesn't build pressure quick enough, the computer will say the pump has failed, even though it's fine this can also cause the salmon relay to overheat because it's actating the pump longer.

The shifting 4 to 0 has almost nothing to do with the pump and points almost exclusively to the temp sensor issue.

Odds are Louduss7 has a low battery and possibly a fried salmon relay and the OP has the temp sensor issue.
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