TRNW-2: 6t40 techm dead apparently

Wed Jul 16 11:04:04 PDT 2025

 That is what we're going to do,  we have another new GM techm I'll be
putting this afternoon, and they have a programming guy out here doing a
couple other cars,  so he'll program this one I imagine,

  I may not have cloned a later model 6t40 techm , but I know I've cloned
later 6t70's and 6L80's without any issues

   Steve

On Wed, Jul 16, 2025 at 1:34 PM Chris and Cathy Kershaw via trnw2 <
trnw2 at trnw.net> wrote:

> 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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