TRNW-2: 6t40 techm dead apparently

Wed Jul 16 10:18:07 PDT 2025

   I don't know, I've got to dig into this more,  I had no problem
downloading the original program, and no issue uploading it onto the new
techm, I don't know if HP Tuner would recognize a corrupted program or not
?  this may be a case of just something weird occurring ? but I'd like to
try and figure out why this happened,  so it doesn't happen again ,  I've
cloned more 6t70's than I have 6t40's ,  I had an issue one time trying to
clone a 2011 6t40's program onto a new GM techm , it loaded, and it worked,
but it had some issue I don't remember,  it wasn't right at any case,  and
I was told the later techm was configured differently than the early 2011
and it required updated software,  the programmer loaded the updated
software and all was well,  at any rate I didn't kill that techm, it just
had the wrong software,

   In my case now the vehicle was a 3rd gen 2017, and I was using a new GM
techm ?

  Steve

On Wed, Jul 16, 2025 at 1:11 PM Reggie Smith <shftless1 at gmail.com> wrote:

> With the P0601 what's to say the program is not corrupt in the original
> TCM?
>
> Reggie Smith
>
> Smith's Transmission Service
>
> 5615 Indian Trail
>
> Thomaston GA 30286
>
> Shop 706-647-9199
>
> Cell 706-741-3117
>
> shftless1@ <shftless1 at windstream.net>gmail.com
>
>
>
>
> On Wed, Jul 16, 2025 at 9:18 AM Steve Everett via trnw2 <trnw2 at trnw.net>
> wrote:
>
>>    it had a p0601 before was the main reason we were replacing the
>> techm,  I wondered about a correlation between the two,  but haven't had
>> time to do a deep dive into it , as I've got units to build and there is no
>> diag guy here to help me
>>
>>    Steve
>>
>> On Wed, Jul 16, 2025 at 9:08 AM <jbockus at hiwaay.net> wrote:
>>
>>> Did it happen to have this code before rebuild? I would start by
>>> checking the power and grounds going to the TEHCM, I've had a few bad
>>> connectors and wires.
>>>
>>> On 2025-07-16 7:57 am, Steve Everett via trnw2 wrote:
>>> > Correct,  but I suppose if he damaged the harness somewhere that may
>>> > have bricked the techm when he first cranked it ?
>>> >
>>> >   Steve
>>> >
>>> > On Wed, Jul 16, 2025 at 8:55 AM Justin Merritt
>>> > <justincmerritt5 at gmail.com> wrote:
>>> >
>>> >> I re read your original post.  If i understand right, you hooked
>>> >> your hp tuner back up directly to the transmission.  If so, that
>>> >> would bypass all other data lines that may or may not be
>>> >> interfering.
>>> >>
>>> >> Justin
>>> >>
>>> >> On Wed, Jul 16, 2025 at 7:53 AM Steve Everett
>>> >> <severett61 at gmail.com> wrote:
>>> >>
>>> >> I'll mention it ,  I would like for it to be something like that,
>>> >> as it is now I'm wondering if I inadvertently did something wrong ?
>>> >> but I've done this dozens of times and never had this happen before
>>> >> ,  its just puzzling
>>> >>
>>> >> Steve
>>> >>
>>> >> On Wed, Jul 16, 2025 at 8:48 AM Justin Merritt
>>> >> <justincmerritt5 at gmail.com> wrote:
>>> >>
>>> >> Look at your data line communication routing.  Years ago my R&R guy
>>> >> messed up the plug to the electric power steering rack on an equinox
>>> >> 6t40 and the transmission would randomly loose communication.  No
>>> >> crank no communication with scanner was our problem.
>>> >>
>>> >> Justin
>>> >>
>>> >> On Wed, Jul 16, 2025 at 7:44 AM Steve Everett via trnw2
>>> >> <trnw2 at trnw.net> wrote:
>>> >>
>>> >> Okay guys,
>>> >> I have no idea what happened, but I may have bricked
>>> >> my first techm ?  although I don't see how ?  I was cloning a techm
>>> >> using hp tuners, like I've done dozens of times, doing it on the
>>> >> bench, we ordered a new GM techm I downloaded the software off the
>>> >> old one, and then re-uploaded the program onto the new tech, the
>>> >> original was from a 2017 vehicle,  the last 4 digits of the part
>>> >> number matched the one we got from from WIT, it was a new GM in a GM
>>> >> box , never opened,  the new techm accepted the software and
>>> >> transfer was complete,  finished the unit, RnR guy installed it,
>>> >> cranked it up and it threw a U0101 code,  try to communicate and it
>>> >> wouldn't , no response, hooked my HP tuners up to the unit,  no
>>> >> response ?
>>> >>
>>> >> Never had this happen before ,  anyone got any ideas ?
>>> >>
>>> >> Steve This message was sent from the TRNW Technical Discussion
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