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2010 DTS
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TCC is the Torque Converter Clutch. It should lock up at 41 mph. Yours is not, so there is a little bit of slippage. Worst case is you will run about 200 rpm higher at any given speed and thus your milage may suffer by about 1 mpg. . Repairing it may be costly as I believe the trans has to be removed. You might want to just drive it as is. Shouldn't do any harm
 
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