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      10-08-2013, 01:16 PM   #87
hamanno
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Drives: Bmw 550iX Hamann Edition
Join Date: Oct 2013
Location: Norway

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Hello,

For all of you that have experienced Drivetrain fault message and have custom exhaust, supersprint, hamann, eisenmann etc, make sure vacuum hoses that controls your flaps on OEM exhaust are plugged/closed.

This will cause damage to a control valve placed in the trunk.

ECU communicate with this valve that controls your flaps on the OEM exhaust.

Valve fools the ECU to think that there is a problem with the boost pressure and therefore reducing the boost below 4000 rpm ( where the vacuum controlled valve in the OEM exhaust normally openes ). The inconsistance of the problem is caused by the valve sometimes was stuck and sometimes not, due to dust and particles blocking the valve mechanism.

Regards 550 owner in Norway :-)
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