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White Diamond '03 DHS (with DTS floor shift)
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86,242 Posts
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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2008 SRX-V8, 1991 Eldorado
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1,543 Posts
Sometimes the sensor itself is the problem. You can run or have a diagnostic run to check the sensor and shift points.
 
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