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MIP on & 4th gear not shifting


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P0742 - Torque Converter Clutch Circuit Stuck On. Its like @desertdude says, there is a mismatch between the engine and transmission speeds that is preventing the transmission from shifting properly. In this case, the transmission is always rotating at the same speed as the engine, which should only happen when the torque converter clutch is locked in the "ON" position. Have the torque converter clutch control circuit checked out for short circuits to positive, as well as the operation of the torque converter control solenoid.  

Edited by treks
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This torque solenoid stuck on or off usually means that there is clutch fragments flying around in the gear even if you fix the solenoid problem later on you will face clutch failure...

it would be better if you throw in a used gearbox....as to reach that solenoid you have to dismantle the gearbox which racks in a good amount of labour...

where as in abc solenoid its usually the valve body which can be accessed by removing the lower case which you can take chances with...

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