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Re: 4L60E Trans ?
Try this;
Get under the truck and disconnect the harness from the tranny. Start it up and throw it in gear and go for a drive with the harness disconnected.
This should do two things, 1st it should throw the service Engine Light, and second the tranny should run in failsafe, I think its third gear, it won't shift in any other gear.
Don't drive far like this. If the Service engine light does not come on, you could potentially have a computer problem.
You should go to a trans shop and see if they can put a bi-directional scanner on it, and command shifts with the scanner. If the tranny shifts into all gears with the scanner, you now have ruled out your tranny at this point.
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