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Check the wires good, that go to starter. And the starter solenoid. Clean and tighten all starter wires. By by passing, and starting it direct tells me that there has to be a problem, in wires or ignition system. see if you have power to starter by testing the wire. Sounds like no click on start=no power to starter.
simular problem. test light and process of elimnation says bad ignition switch. My venture won't cold start, but after inital start will start a day long. When cold the switch does not send siginal [yellow wire] to PCM for ground. Replacing ignition switch tommorrow.
Starter Fuse? Possible failed ignition switch. Loose Cables on battery or starter. Starter not grounding properly. Bad starter Relay? Use Voltmeter check voltage going to main starter wire while someone cranks the motor if not power check power to starter relay while cranking if no power suspect ignition switch.
If you had battery unhooked and assuming that it is turning over try this
Put your key in turn it on dont start wait 10 mins remove key wait 10 seconds repeat this a total of 3 times. If that dont work try a different key do the same thing. This relearns your key to the ignition it started with Gm cars and trucks from 1999 to to 2006. It is a big problem but there is no recall that I know of. If that dont work a dealer needs to probably replace and reprogram your ignition switch and keys
shorting to start motor will allow the motor to turn but the ignition system is still off. try with key turned to ignition position. suspect starter solenoid on starter motor. suspect fuses maybe there is a fuse which has blown. suspect ignition key switch maybe defective.
either replace ur ignition switch or replace ur starter solonoid
when u turn on ignition switch u should get a click fron a relay under dash listen for that and if u hear a click then u need to replace solonoid on starter or replace whole starter motor also clean and inspect battery cable good luck with this project