Question about Pontiac Grand Am

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My cars check engine light came on today and when I hooked it up the code P0742 came on. It didn't shift funny or act any dif other than when I take off from a slow stop to a complete stop it shutters a little. What does this mean?

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Its the torque circuit but i would be able to help more if you provided year and model.With the torque convertor clutch stuck on, the torque convertor is not disengaging causing the bucking. There is a constant TCC apply. It means you probably have a defective TCC solenoid or TCC-PWM solenoid on the valve body. To correct the problem one of them needs to be replaced.

Posted on Mar 26, 2011

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The code PO742 indicates the torque converter clutch is stuck on.
The torque converter is what connects the engine to the transmission.
It engages and disengages according to signals from the pcm, to aid in
smooth shifting. There are a couple of things you can try. make sure trans. fluid is full, if thats ok check the 20 pin connector, located on left
side of car on top of transmission bell housing. Make sure there's no
corrosion or bent pins. If this clears the code your all set, if not you may
want to ask your mechanic and see what he/she recomends.
Hope this helps.
Good luck

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