Wiring diagrams for transmission and the TCM control module?

More than likely, you have a short in the wiring. So, we need to use this testing to figure out what is happening.

What transmission do you have? More than likely, it is the 4L60 but if you have the 6 speed then the testing is slightly different so we would need to know that.

Please see this testing and let me know what questions you have but if this code was there prior to the replacement and still there no and you cannot communicate with the TCM then it sounds like a wiring issue that we are going to have to track down.

Thanks

I have a Silverado k2500 1994, 506 diamond block and 4l80e transmission, VIN 2GCFK29S1R1261336. I need wire diagram for transmission and TCM, getting crazy with all this wiring, and can't find the correct diagram. The truck only shifts up to second gear and has error codes 83 and 56.

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Cheers, Ken