TRNW-2: 6t40 techm dead apparently

[jbockus at hiwaay.net]

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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