TRNW-2: 6t40 techm dead apparently

Wed Jul 16 10:33:29 PDT 2025

I think around 2015 things changed, global a communication I think it’s
called. I’m not sure if hp tuners module swap programming works on those.

I’d try going direct to tcm with hp again, if it communicates go direct
with a different scan tool. That should separate vehicle from trans issues.
If you decide to install another tcm I think I’d program it through gm.

On Wed, Jul 16, 2025 at 1:21 PM Fred Whitaker via trnw2 <trnw2 at trnw.net>
wrote:

>  I have to agree with Reggie. P0601 says internal control module problem.
> ------------------------------
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> on behalf of
> Reggie Smith via trnw2 <trnw2 at trnw.net>
> *Sent:* Wednesday, July 16, 2025 12:11 PM
> *To:* Steve Everett <severett61 at gmail.com>; Technical Discussion Forum <
> trnw2 at trnw.net>
> *Subject:* Re: TRNW-2: 6t40 techm dead apparently
>
> With the P0601 what's to say the program is not corrupt in the original
> TCM?
>
> <https://www.google.com/maps/search/5615+Indian+Trail+%0D%0A+Thomaston+GA+30286?entry=gmail&source=g>
>
> Reggie Smith
>
> Smith's Transmission Service
>
> 5615 Indian Trail
> <https://www.google.com/maps/search/5615+Indian+Trail+%0D%0A+Thomaston+GA+30286?entry=gmail&source=g>
>
> Thomaston GA 30286
> <https://www.google.com/maps/search/5615+Indian+Trail+%0D%0A+Thomaston+GA+30286?entry=gmail&source=g>
>
> 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 ?
> >>
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