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Old 05-21-2014, 12:18 PM
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02 yukon denali no gears

Have a 2002 yukon denali with the 6.0 and the 4L65E AWD, there were no gears so pulled and rebuilt and replaced torque convertor. Before pulling there were no transmission codes, after the rebuild and install there were 4 transmission codes P0740, P0785, P1810, P1860. I know what the codes mean, so I pulled the valve body and wiring harness and replaced all the solenoids and the wiring harness doesn't show anywhere there could be a short, replaced the valve body, the pump is pumping fluid but there still is no movement however I do feel it start to engage when I put it in gear. I'm now lost on what else to do, I have the transmission pulled and apart again, I'm going to double check everything again and replace the pump and pump housing any other ideas would be greatly appreciated.

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Old 05-21-2014, 12:37 PM
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Look for a single point failure such as stripped splines.

Try the input shaft in the convertor and see if it will spin the turbine.
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Old 05-21-2014, 01:19 PM
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As crazy as this sounds, my Wife's 2005 Tahoe had the same Codes, and, they changed the Ignition Switch and it fixed it! I'm not saying that is the culprit, but I would do some investigating-

GM truck bad ign. switch
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Old 05-21-2014, 01:24 PM
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The convertor spins everything when it's on there, and we have even unplugged the electrical to the transmission and still no gears.
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Old 05-21-2014, 01:34 PM
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I have also done research on the ignition switch and it seems like with everything that the cluster doesn't work when that happens but it works fine on the denali
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Old 05-21-2014, 04:06 PM
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Look deeper into splined areas.
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