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Cobalt Transmission problems... I think?
09-26-2014, 11:07 PM
Post: #21
RE: Cobalt Transmission problems... I think?
Without having all the codes, which may not show up for a few drive cycles (read: cold to warmed up and then sit for a few hours) we can't help much more. As I stated earlier, codes need to be addressed in the order they show up on the scanner. If you skip a step you make more work for yourself. Right now the only thing we know is the ECM was replaced when the guy said it should have been the TCM originally. I mean, it could be they both need work but a faulty TCM will still give you shifting issues... and what happened to pulling the pan to make sure the trany was ok? On an 8 year old car it's certainly due for servive so you might as well have a look inside.
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09-27-2014, 09:33 AM (This post was last modified: 09-27-2014 09:33 AM by Garner.)
Post: #22
RE: Cobalt Transmission problems... I think?
I don’t have a problem with pulling the pan to have a look, but it really doesn’t sound like a mechanical issue to me. If the mechanic was able to make it shift properly with the scanner that would tend to indicate that the transmission is mechanically OK and it’s just not being “Told” how to shift by the TCM.

I haven’t seen any more information on the “Short or Open” code; P0604, that was mentioned earlier. Until that issue is solved the transmission is probably going to remain in “Limp.” It would be like having a perfectly functioning TV and a remote with no batteries in it. The TV won’t change channels because it’s not getting a signal to do anything, so it just stays on one channel. When the mechanic hooked up the scanner and it worked, that would be like getting up and pushing the buttons on the TV to confirm that it is working. Go back to post # 16 and review! I’m pretty sure that this issue must be solved before you will get any positive results. That’s why I would start at checking for constant power and ground at the TCM. If a wire is broken or shorted; even intermittently, you will have a TCM fault and replacing the TCM won’t change anything. I’d hate to see you spend more money on a TCM just to find that you only needed to spend a couple of bucks to fix a broken wire or replace a weak relay.

Please keep us up to date on your progress.

Thanks for using the forum,

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