Question about 2000 GMC Sierra

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4l60e 2000 gmc tRANSMISSION PROBLEM

Check engine came on. My code reader says code #s 740, 785, and 1860. The first two are generic and the third is TCC PWM Solenoid Circuit. The tow/haul light will not work when I push the button. Everything else seems to be doing fine. I am an old school mechanic and have rebuilt many older GM transmissions, but I am lost on the newer stuff. I need to try to save some money and would like to do this repair myself. Any help would be greatly appreciated. Thanks, David

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Replace the solenoid pack, or the wiring to the trans has problems. Usaully the solenoid pack in our Chrysler trans, but every once in a while, it is bad wiring.

Posted on Jun 02, 2009

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Here is what I have listed, more than likely you have the 4L60E which is 5qts.
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