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Thanks for your reply. I am trying to avoid converting to drive by wire. So I guess I need to search for a completely stand alone 6L80 controller.

I have an LS3 (Crate , mechanical/cable throttle) and currently changing the manual transmission to 6L80e. I am trying to find a suitable harness and ECM/Operating system to run this combo. Currently...

What did you do to think you've got it working.
Yes , in this project (Blazer MY 1994) my 4WD is connected and working , I had to machine the input shaft so it will fit into the transfer case of...

same issue at cruzing , shifting back and forth between 6-5-4. With my PRND , i get D6 which gives me all 6 gear , D5 which only gives first gear ! , D2 1st and 2nd and D1 first gear.

Did you...

Yes it seems the no BCM is the common domination for such an issue. I will try your suggestion and see how it goes.

Did you ever manage to resolve it completely ?

What about the shift speeds...

Yes , am afraid so. Two months and counting. I checked all the wiring and cleared all the codes including crank relearn.

It is still a stock tune , so I have not played with the tran tune , apart...

I am having the same issue , did you get it fixed , how?

thanks

I have exactly the same issue , how did you resolve yours ?

http://www.hptuners.com/forum/showthread.php?44982-Sudden-downshift-what-is-going-on-here&highlight=sudden+downshift

please see http://www.hptuners.com/forum/showthread.php?45077-Case-Relearn-is-it-possible-without-a-break-signal/page2&highlight=abumalik

Please see post 29 for the tune and 36 for the log file. ...

My TM has always been on , did it help after you turned TM on in your case.

Max line pressure set to 105 psi. Upshift on the soft side but thats OK for me. My TM is enabled , but still have the abrupt downshift issue.

OK , after some reading ..... , write entire changes the OS.

So I guess the TCM is MY 2009 but now been flushed with a 2007 OS. So what if I flash it with a 2009 tune (write entire). Then the OS...

Wow , a new twist ...

Well , I can't tell if OS 24239353 is from 2007 (where can I find this info), the label on the transmission indicates year 2009 , so I assumed the TCM must be from the same...

But what will be the indication for a matching set , will they have the same OS number ?

at the moment this is what I have for ECM and TCM

Type: Cadillac Escalade (V8) 2007, E38 T43
VIN:...

Attached the label on my Transmission, I have not been able to find GM naming convention but I assume this is 6L90e model 2009. Can some one please confirm. What will then be the best ECM 38 to match...

Yes the TCM and ECM are different years but I get full 6 gears without issue most times, its just this crazy non-called for downshift. And yes I teed the break lights to pin 9. So it is only getting...

HotRod,
first many thanks for your support. Your config file was helpful , even though not made a real progress. Please see attached log and note what happens at 10:25.7 where it shows down shifting...

The pedal from a Denali 2007 , the pedal harness was built by a local shop specializing in this stuff. The car idles fine and throttle response when not in gear is very crisp. Tomorrow will beck all...

Ok , I see what you meant. Everything is stock. And as I said , I installed the same ECM in a different car and it ran ok.

I am pretty sure it is not the tune or MAF. I installed the MAF from my DD Denali and no effect. Even more , I removed the ECM and plugged into the DD Denali and drove around town and all worked...

OK, charged the laptop and had another go , no codes thrown even when I accelerated and encountered my infamous sudden downshift. This time (after fitting a new USB cable !) it allowed me to do a...

I did not notice any codes (didn't have time to save the code log as laptop run out of battery). Any way , Pedal response is OK when engine not running or even at idle with transmission in park or...

I am having exactly the same issue with "Not all conditions met" , did you manage to solve this ?.

Hotrod , done as advised. Still could not perform case learn. Took it for a short drive , same as before. This time noticed the TPS does not respond immediately and car choke and appear to be staling...

I have swapped in a 6.2 engine (Esclade MY 2007) and an 6L90e MY 2009 into a 1994 Balzer/Tahoe. I flashed in a stock tune from my DD factory Denali XL MY 2007. So apart from the front O2 sensors ,...