has anyone lost power to there TCM? I get the code U0101. I checked all my fuses... replaced the TCM. and now im begining to think there is a short somewhere. car runs/idles normal. goes into R ..N.. P..and drive but when in drive it will not shift out of gear:/ also my speedo doesn't read mph but rpms still work. CEL is on and power steering is also on. thank you for your help

 

what's a tcm?
you mean pcm?

 

TCM = Trans Control Module
PCM = Powertrain Control Module

 

You could go to autozone or somewhere and you can buy a thing to alldata. I believe you get to pick 1 car for a certain year and model. Then you can search the code and it will have GM's flow chart for the diagnosis. If you want on tuesday when I'm back in school i'll search the code for you. I can print the pages off and I could probably scan them on my computer and upload them. Unless that's against the law or something since alldata isn't free.

 

Also was the TCM programmed when installed? Who programmed it if it was.

 

Oh, that's right. Hmmn.. strange. I'm sure someone could give you an answer around here.

 

plug and play from ananother 05 cobalt. same part/model #

 

O I thought this was gonna be another comin out the closet thread

 

I'm not sure if that would work man. I think most GM PCM/TCM's are a one time thing. When a new one is installed in a car a Tech has to program the VIN into the PCM. Not sure if that applies to cobalt PCM/TCM's but if it is then thats your problem. You might have to just take it to a dealer to see if they can figure it out. Might be a hefty bill though.

 

Yeah you cant just plug computers in and expect them to work. This isnt honda. The computer needs to be flashed and i believe that can only be done with a techII

 

as long at both tcms have the same caliberations, tire size etc. "hot swapping" will work and you can tune the new TCM with trifecta, all vince needs to do is change the vin on your last TCM tune to match the vin on the new TCM.

if you're gonna answer the question accurate info does help, this is already a reason why css is looked down upon. nothing personal to anyone that supplied misinformation. i'm just tired of seeing a bunch of "i don't knows" until someone that does know pops up with an answer.

 

Well, I am fairly certain with a E37 ECU it wont work that way due to the way the computers communicate with eachother. If it works with the older pre-CanBus system then so be it, but dont be an ******* about it, we all make mistakes. We arent all mechanics or experts, Im an engineer by trade. You yourself said that the vin needs to be changed so i was not that far off.

 

that's why i did point out that I meant no offense. kinda hard to get across emotion in written text. i have even tried an 07 TCM on my 06 and although it did work for the most part the calibrations between the model years is different in some very key areas. we are all here to learn, right?

 

Im almost positive you can swap tcm's as long as it has the same calibration and part number as the one u had origanly but don't quote me I work for Mazda lol

 

that's exactly what I was saying.

 

did the TCM need to be programmed with VIN # or was there another issue? I started throwing the U0101 code last week and have the same symptoms. I ordered a replacement TCM from a 2007 cobalt (same year as my car) with the same part # and everything.