2006 Chevy Cobalt Transmission Control Module Failure




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Souleye Oudraogo: I turn the ignition on ..but the check engine light is off ..the problem is I was putting a new horn on the the the positive touched the body of the car nd now the problems started ..the car won't start at all ..what should I do ..u think that the pcm is scratched..

joenerps: A friends car had a similar problem, researching I found that either a pitted fuse for the "transmission control Module or TCM"  or a loose wire can be and was our problem!!
The fuse was fine!! but one of the wires I aimlessly moved around did move, the car has worked well since, the problem is I don't know which wire it was!!! but have pinpointed where the problem is, "in our case"
Along side your transmission shifter on the passenger side is a panel to gain access to your Body Control Module or BCM. "  Google Colbalt BCM Location and check images"  the fuse number for the TCM is 25 if the fuse is ok then check for a loose wire in the BCM!! Hope this helps someone!!!

Martin Salas: para reparar este problema hay que abrir el modulo TCM, biene muy bien cerrado, pero hay que abrirlo y en la parte de adentro hay que soldarle un pequeño alambre que es el que hace la tierra con el conector exteror, se troza por eso marca este error, yo ya lo hise con mi carro y funciono

Juan Torres: Ive been having this problem. I took it to the dealer, the mechanic hasnt given me a call back. The scanner code that appeared was u0073 communicaton modle bus off. I called and emailed GM well as NHTSA. Just waiting for a response. I hope they make a recall on this issue its unsafe to drive like this. I did my own research. I came across that alot of people changed the TCM and problem was fixed. But some suggested to clean the fuse box the BCM and ECM. Check the ground wires and Transmission wires. I did that and drove the car a few blocks and it seemed ok.... For now... If the issue continues I guess I'll have to buy the TCM ugh. 

Amber Webster: Have the same problem here with a 2008 chevy cobalt never again in my life will i drive or own a chevy this never would have happened with a ford. Whats the fix to this

Brian Arrington:

My car has had this problem since 40k miles. It now has over 70k miles. Ill be driving down the interstate and the power steering will go out. This isnt safe, but when I called GM they said "tough luck". Report your problem to NHTSA at 18883273246 if they receive enough complaints GM will be forced to issue a recall. 

Leah Marrs Scott: VERY same problem with mine today. Had it fixed.  Got a new transmission control module. Works fine now. 

Gorgi Dimitrov: i have same prpblem.on my 06cobalt can you tell me how to fix 

Ivan Ortega: i have the same issue with my cobalt can u please help me out 

Texassince1836: Ignition switch will do this

Jaime Merino: Bad luck, mine is still great!

lisa robertson: Same problem with our 2005 Chevy cobalt. Bought this for our newly driving teen. Replaced the ecm and the tcm. Cleaned the ground wire to the ecm. Found that it was a fix for two weeks. While driving it will randomly loose all power steering. All of the gauges and lights go crazy. Transmission shifts very hard. The car stalls out. Also have a clicking noise in the transmission shifter all this goes on at the same time. Anyone have these same problems and found a fix for it? We only bought this car 19months ago. The car had just over 30 thousand miles on it and we have put about 1500 on it. My guess is that the previous owner was having the same problem and that is why the low mileage. I don't know .. but my 17year old draughts life is more important than any $$.

birdman3003: try disconnecting both battery posts for 20 minutes. this is to reset transmission control module. reconnect both battery posts and start car. the check engine light should go off. if your tcm was not previously dammaged then it should shift normal because it stores shift points and sends them to the transmission. if it does not shift as normal then you probably need to change the tcm...Please note, in trying this POSSIBLE SOLUTION, YOU ARE DOING SO AT YOUR OWN RISK. IT MAY BE BEST TO TAKE CAR TO A CERTIFIED MACHANIC!!!

Sandra Burleson: Found my 2007 Chevy Cobalt problem: it's not a Ford Ranger.

Alisa New: thanks for this, my car is doing this!!!! except i'm having trouble with my traction too! I'll check into the power steering issue though with my dealership!

Amber Sanders: my 05 cobalt did the same thing and they replaced my tcm and a yr later it started doing it again! the dealership said 1200 to replace power steering unit. cobalts were recalled for power steering in 2010 so if u haven't had urs serviced at dealer to replace unit its free under recall. as for the tcm...I don't think it will ever get better since mine did it all over a yr later.

Bernadette Mendoza: my car hesitates to shift, like i try to put it in gear and it gets stiff. i just replaced the transmission. also, sometimes when i turn it on, my rpms fluctuate over and under the 1. it feels like its about to die, but it doesnt. and it doesnt lose power when im driving, help?

Strife Cloud: Hey I have a 2006 Chevy cobalt, when I shift to drive I hear a loud thump, when i shift to 2 gear I hear another thump and it hesitates, then it won't shift to 3rd gear, any ideas?

Jason Smith: It really depends on how you take care of it. Mine has over 150,000 miles and all ive needed when i got it used was newe brakes and a new terminal for my battery cause the old one was corroded and wouldnt allow me to start everytime

Jason Smith: ive had mine for a year n it has over 150,000 Miles. Havent had any problems except squeaky old brakes n car not starting everytime because of an OLD terminal. Its VERY Reliable. And if you think its so crappy, how you going to sell it if you have nothing good to say? Idiot like you obviously dont know anything about cars n should just keep out of one.

Cert: Building stuff is always in my family gene. My dad is a new york auto technician and taught me everything I need to know about cars. Now I sell car parts online to suppliment my income. So it does help when there's good guidance.
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