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  1. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Well, anyone still following this thread?? If so, quick update. Ended up having to replace the starter after all last weekend. Went to start it and again, nothing. Everything was getting power as it should, grounds were all good, so I took a long ratchet extension amd a hammer and beat on the...
  2. J-Herkel

    07 LT 5.3L Sudden no start/crank

    I definitely considered setting it a blaze a time or 2.. but I also needed to get to work so had to keep at it! Appreciate it!
  3. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Yeah I definitely am not going to go out of my way right now to fix it if it breaks. However, if I happen to find myself at a junk yard in the future, i will look for one to have on hand.
  4. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Great information! Thank you!
  5. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Alright so.. my jumper wire worked. It cranked. Thank you Lord!
  6. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Since the starter relay and the run/crank relay share the same N5 ground on the bottom of the board and the run/crank N5 seems to have continuity and the starter doesn't, I added a jumper wire. I'm going to see if it works. If so, this will be my permanent fix. This jumper is just a ground wire.
  7. J-Herkel

    07 LT 5.3L Sudden no start/crank

    So I went back again this morning and did some continuity tests from the top of the board, starter relay terminals, to the bottom of the board terminals that plug into the banks of wires that run to the other components. Relay terminal 87 (F1)(to 40amp starter fuse) has continuity and is good...
  8. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Once I get it all back together I'll try a jumper ground wire. Appreciate the compliment.
  9. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Alright so after some more diagnosis this evening, I had my buddy hook up his $7000 scanner and scanned the entire vehicle. The Theft Module is good. The BCM was good. The ignition switch is reading key postion correctly, the signal is being sent when the key is turned to the crank position...
  10. J-Herkel

    07 LT 5.3L Sudden no start/crank

    I'll check it when I get home. I know what you're talking about. The firewall side is good. Haven't checked the engine side.
  11. J-Herkel

    07 LT 5.3L Sudden no start/crank

    The fuses that matter, checked for continuity. All good.
  12. J-Herkel

    07 LT 5.3L Sudden no start/crank

    I took the entire Fuse box out yesterday, took it apart, removed all fuses and relays, removed the inside board and it was all clean. No corrosion. I will ohm the ground later when I get home. I'm praying it's something simple like a bad ignition switch but at this point, I have no clue anymore...
  13. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Thank you. I have a friend coming over tomorrow with an advanced scanner to see if it comes up with anything. I'll keep you updated and highly appreciate your help!
  14. J-Herkel

    07 LT 5.3L Sudden no start/crank

    I've tried N. Wiggling it while cranking, just took the ignition switch off and wiggled it while cranking. Stepping ******* the brake pedal. Nothing. It's like a wire or something somewhere just got cut or came off. Usually I'd see signs on failure before actual failure but this time it just...
  15. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Wouldn't it throw a code if it lost coms with the BCM?
  16. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Yes, just accessories. It jumps to 12v when the key is being turned to the crank position.
  17. J-Herkel

    07 LT 5.3L Sudden no start/crank

    So the Fuse you mentioned is good. I went as far as taking the entire Fuse box out and apart to inspect it all and there is no corrosion, broken pieces or blown fuses. I had my wife turn the key as I checked the voltage in the relay slot. There was a constant that read 12v and the signal that...
  18. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Thank you for detailed breakdown. That's great info! I will check all of that today and get back with you. Amd as far as jumping the relay, yes I was jumping it in a manner that allowed the starter solenoid to energize the starter and turn over the engine. Wanted to rule out a bad starter.
  19. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Thank you! ill see if i can trace some of those wires.
  20. J-Herkel

    07 LT 5.3L Sudden no start/crank

    I did. No luck. The problem is somewhere before the relay.
  21. J-Herkel

    07 LT 5.3L Sudden no start/crank

    I don't unfortunately. I've been trying to find a wiring diagram online but not having any luck.
  22. J-Herkel

    07 LT 5.3L Sudden no start/crank

    Getting to the point.. 2007 Tahoe LT 197k miles. Suddenly would not start back up today after running fine for years and even started up 3 times prior today. Battery is brand new, took it out and tested it at the auto store. It's good. Alternator is fairly new. Starter was tested and is good. It...

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