New scanner VCM Controls

[shane2500hd6.0]

ok i saw this thread i think i did some shit wrong so i went in was on this trans present and then clicked fast learn but truck wasnt running i didnt think anything was working when i was clicking it didnt ask me to do anything so i just got off that special feature and went in reflashed my tune into truck now my truck wont move at all i even tried reflashing back to original file still nothing and its a 08 gm 2500hd 6l80e its my truck so it is what it is i gotta learn some how so now my question is did i fuck the tranny or is it savable

[TransGo Robert]

ok i saw this thread i think i did some shit wrong so i went in was on this trans present and then clicked fast learn but truck wasnt running i didnt think anything was working when i was clicking it didnt ask me to do anything so i just got off that special feature and went in reflashed my tune into truck now my truck wont move at all i even tried reflashing back to original file still nothing and its a 08 gm 2500hd 6l80e its my truck so it is what it is i gotta learn some how so now my question is did i fuck the tranny or is it savable

Unplug the scanner, get out of the car and lock the doors with the remote. Go back in and try it again in 20 minutes it should move. If not, start the engine then unplug the transmsision to see if it moves or not. If it does move then the TEHCM is either fired or programed wrong.

[shane2500hd6.0]

i dont have a remote just one key isnt the tcm inside of trans shit happens im new so learning is doing things but is what it is

[TransGo Robert]

i dont have a remote just one key isnt the tcm inside of trans shit happens im new so learning is doing things but is what it is

Ok then just lock the driver side door using the key and wait 20 minutes or so. And yes the TCM is inside the transmission, mounted on the valve body, it is called a TEHCM because it comes with the solenoids as well.

[shane2500hd6.0]

ok i will try that when i get home later ok so i can replace all that instead of whole transmission im used to older stuff and the gen 3 4l80e

[shane2500hd6.0]

its also throwing codes for no communication to pcm/ecm and tcm but iv seen that before when flashing a tune so idk

[TransGo Robert]

its also throwing codes for no communication to pcm/ecm and tcm but iv seen that before when flashing a tune so idk

Communications codes should be address before replacing the TEHCM for sure, those can be tricky to diagnose.

[shane2500hd6.0]

never had those codes until i flashed it i drove truck in shop now wont drive check this file out does anything stick out thats not good in trans area maybe i fucked it up

[TransGo Robert]

never had those codes until i flashed it i drove truck in shop now wont drive check this file out does anything stick out thats not good in trans area maybe i fucked it up

I don't know enough about tuning to be able to help on this one unfortunately. Hopefully other can help with that.

[shane2500hd6.0]

ya me either and by the looks newbies are very well liked not like im competion or some shit just trying to learn this shit but thanks for the help you were only decent one to chime in haha ill keep digging and try the key thing later

[TheMechanic]

The communication "U" code is likely the result of the TCM being bad. As Robert said try unplugging the trans harness and see if you now have a gear. If you do the next step is to plug the connector back in and attempt to communicate with the trans. I use Data Bus Diagnostic Tool. It will tell me right away if a module is to giving a state of health message. A scan tool that will directly communicate with the trans should be good enough if you didn't do anything wiring related and ALL power and grounds check out good.
Knock it off with the newbie crap though. Everyone on here does not pick on new people. They will pick on someone who comes in wanting everything done for them for free, is ungrateful when they get that help, and feel entitled to head of the line privileges. So as long as your not a dick you will get the help you need.

[gtstorey]

The communication "U" code is likely the result of the TCM being bad. As Robert said try unplugging the trans harness and see if you now have a gear. If you do the next step is to plug the connector back in and attempt to communicate with the trans. I use Data Bus Diagnostic Tool. It will tell me right away if a module is to giving a state of health message. A scan tool that will directly communicate with the trans should be good enough if you didn't do anything wiring related and ALL power and grounds check out good.
Knock it off with the newbie crap though. Everyone on here does not pick on new people. They will pick on someone who comes in wanting everything done for them for free, is ungrateful when they get that help, and feel entitled to head of the line privileges. So as long as your not a dick you will get the help you need.

A little bit of punctuation helps too.

[shane2500hd6.0]

ya i haven't plugged my scanner into it yet and im a mechanic i work on vehicles all day im not stupid but half this stuff i have no clue on i was raise on carb motors old trucks i just purchased newest truck ever i didn't know you could do the stuff this device does ill learn from my mistakes and my spelling sucks i no i apologize i didn't say everyone but iv got very slim people to help i dont want it done for me just some pointers right direction thanks ill try all these things rate now

[shane2500hd6.0]

so i unplugged trans and it wont even start which i thought it wouldnt so do i do tht while its running

[TransGo Robert]

so i unplugged trans and it wont even start which i thought it wouldnt so do i do tht while its running

You have to start it first, then unplug it. You need to have it connected in order for the starter motor to work.

[shane2500hd6.0]

ok so now i started it and when i give it some throttle it starts to move forward do i have something set wrong in the tune i guess

[TheMechanic]

ok so now i started it and when i give it some throttle it starts to move forward do i have something set wrong in the tune i guess

I will give it a stretch and say it is nothing in the tune. I base that on the communication errors to the TCM. If you had a table or setting incorrect or just off a little it would be a driveability issue not a catastrophic style of no forward gears. Not being a smart ass but as a mechanic your first course of action is always to pull a scan tool out and scan the vehicle for com and codes. If you have codes your next step is freeze frame so you have a better ability to re-create the conditions for the code and a possible cause. Next is verify a customer concern. Next is diagnose to the component level. Next is authorize the repair, second to last is fix and last verify the repair by recreating the same criteria or a drive cycle. Collect that money.