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      01-08-2013, 07:43 AM   #7
divisionbell77
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Drives: 2011 335i XDrive Coupe
Join Date: Mar 2012
Location: Ohio

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What do you mean by 'press?' Pressing it turns DTC on, not off. Holding the DTC button in for a few seconds will turn DSC completely off.

DTC is a function of the DSC system. It is off by default. DTC is for better wheel traction and stability in loose ground(snow, dirt, etc).