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  1. G

    2009 Tahoe LTZ U00730 code, Transmission goes into limp mode.

    Me too. My dealership said it would be around 1400 (10hrs labor)to check all the firmware for updates plus the cost of the updates. I used the AC delco website and my bidirectional scanner at home and was done checking in about 1 hr.
  2. G

    2009 Tahoe LTZ U00730 code, Transmission goes into limp mode.

    There was a tsb issued I believe it was for the 2012 and newer that ran across a while back but can’t remember where I found it if said did not pertain to 07-11’s. But as we can see it pertains to all of them. lol.
  3. G

    2009 Tahoe LTZ U00730 code, Transmission goes into limp mode.

    UPDATE- I believe I’ve got this one figured out!! I do have a bi-directional scanner( it’s the only way I would have figured this out). going through all the modules one at a time checking for updated software and coding issues within the modules I happened to be watching the BCM info and...
  4. G

    2009 Tahoe LTZ U00730 code, Transmission goes into limp mode.

  5. G

    2009 Tahoe LTZ U00730 code, Transmission goes into limp mode.

    yes. we are refering to the same 18 page TSB gm put out
  6. G

    2009 Tahoe LTZ U00730 code, Transmission goes into limp mode.

    Hi guys, new here and first post- that being said if i screw something up Edi quite wise please let me know respectfully. My 09 POS is throwing a U00730 in the TCM. U0073 Code: Control Module Communication Bus “A” Off I found this in one of GM upfitters wiring books online -This code is mapped...

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