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2007 Tahoe LTZ 4x4 electrical problem

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Howdy, totally new here with a problem. We have a 2007 Tahoe LTZ that developed an issue about a month ago. My wife is for the most part the  only driver and weve had it since new. Since she retired she drives it about 1000 miles per year, mostly full of grandkids. About a month ago it started flashing "traction control off, service stabilitrak. It turned on a cel : p0101 lost communication with tcm. Shortly after the rear hatch wouldn't open, the shift indicator quit working, and it picked up a p0073 code. The next day it wouldnt start,  showing a security icon. I disconnected the battery and reconnected it after 1/2 hour, it restarted, the security icon was off, I backed it into the shop, shut it down, restarted it with my scanner hooked up checked fuses, wiring for damage etc. It was on reduced power with the same codes, battery @ 12.6v shut off 13.8v @ idle the it died, the security icon was back. I disconnected the battery again, this time overnight, now it still has the security icon, wont crank or start and it wont communicate with my scanner. Im leaning toward the ecu as we had a similar issue with our Ford Powestroke a few years ago. I dont want to throw parts at this but Im kind of up against a wall at this point. Any suggestions would be appreciated! I have a 53 m38a1 with a Kubota turbo diesel SM465 and less electronics than her stereo. My suggestion was to build something like that. Shes not interested. Thanks again!

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5 hours ago, silveradosid said:

google 2007 tahoe ground connections and clean every connection you find first


Yep, check all the grounds. Also, try removing the PCM (computer) and checking for corrosion or water on the connectors. 


If that doesn't work, let us know and we will try to help more. 

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