2009 c5500 a50 - help!

will24

will24

That guy
Joined
May 6, 2010
Messages
2,719
Hey guys, I have a dilemma. Hoping an Allison expert can help me out... I replaced the tcm on a c5500 for a customer. OS on the new dealer TCM was a different version. I have saved copies of the new blank, original and a version I built from the new blank and original parameters. Is anyone willing to look at these via email to see if we can make something work??

Thanks
Will


Sent from my flashscan v2
 
It takes the flash but I get a continuous flashing service light and have no communication at all with the new tcm once it's flashed.


Sent from my flashscan v2
 
What does it do with the file from the dealer? What platform are you using to flash?


Ryan
 
WinXP, flash scan v2, v8 updated The original file (new tcm) gives me no prndl or vin, limp mode regardless of file. Wiring etc is good to go (swapped in a known good tcm after fixing a boatload of wiring, it fixed the problem)


Sent from my flashscan v2
 
I'm just not sure what I'm missing, there's a base tune on the TCM, I've tried a full flash with the original cal and OS, a modified version of the new OS and cal (parameters set). There's just something dumb I'm missing


Sent from my flashscan v2
 
A50

Did it work when the dealer flashed the file after you installed the new TCM? I have never had a problem. What are you trying to flash in the new TCM?
 
Stingpuller said:
Did it work when the dealer flashed the file after you installed the new TCM? I have never had a problem. What are you trying to flash in the new TCM?
Click to expand...



Didn't work on initial dealer flash. He flashed it with just the proper VIN and still no comm. missed the base file from TCM with parameters from old TCM and no function. I wrote a TCM file based off of a good functioning C4500 still no worky but he can swap TCM and flash in the right vin and it works fine. I'm chocking up he got a bad TCM


Ryan
 
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