BCM and PCM Locations? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 16 (permalink) Old 09-12-2012, 04:55 PM Thread Starter
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BCM and PCM Locations?

I have a 2005 Chevy Cobalt Sedan Base model. It's been electrical issues since it hit 20,000 miles. Can anyone take me a screenshot of the BCM and PCM locations. The BCM is right beside the fusebox under the hood? If anyone would have a picture or how-to-remove procedure. I'll glady be appreciated.
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post #2 of 16 (permalink) Old 09-12-2012, 05:15 PM
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BCM passenger side front center console.



And "PCM" sits in front of fuse block under that curved protective cover. If you have an automatic you will also find the "TCM" sitting in front of the "PCM" in piggyback.


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post #3 of 16 (permalink) Old 09-12-2012, 05:33 PM Thread Starter
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Im sorry I meant the TCM, and yes mines automatic. Do you have a pic of the TCM?

---------- Post added at 06:33 PM ---------- Previous post was at 06:32 PM ----------

Do you perhaps have facebook or something I could ask u a few ?'s about my car..if you got the time
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post #4 of 16 (permalink) Old 09-12-2012, 05:47 PM
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Let me check the server.

---------- Post added at 09:43 PM ---------- Previous post was at 09:35 PM ----------

TCM is the Transmission Control Module.



---------- Post added at 09:44 PM ---------- Previous post was at 09:43 PM ----------

Post here so everybody can learn at the same time.

No questions are stupid and only the stupid don't ask questions.

---------- Post added at 09:47 PM ---------- Previous post was at 09:44 PM ----------

I would rather keep all questions in forum but if you must, then just click on my nickname and PM me. Don't know if you need a certain amount of post to do this but it's an option.

---------- Post added at 09:47 PM ---------- Previous post was at 09:47 PM ----------

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Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2007 Cashmere metalic Cobalt LS Sedan 2.2L auto 1G1AJ55F977161789


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post #5 of 16 (permalink) Old 09-12-2012, 06:01 PM Thread Starter
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How do I access it? The dealership claims the TCM is in the rear. My problem is the theft lock security indicator on the instrument cluster stays on when the car is trying to be cranked. Tried several methods to clear security light. Towed it to the dealership and they claim no communication with the BCM or the TCM modules. So, I continued researching, they wanted $1,000 for replacements and flashing. So I'm going to put the parts in myself while its at the dealership and just let them flash them. Any help you can give me. This car has been a nightmare
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post #6 of 16 (permalink) Old 09-12-2012, 06:14 PM
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Don't think that's your problem.... Theft deterant module maybe. Have they done a relearn on the car at all and it doesn't work or are they guessing?

---------- Post added at 10:14 PM ---------- Previous post was at 10:12 PM ----------

What are the DTC's? Can they communicate with the "PCM"?

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post #7 of 16 (permalink) Old 09-12-2012, 06:45 PM Thread Starter
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I tried the learn procedure with the on/off method. Light stays solid the whole time with power steering as a message on the display near the instrument cluster. They said no codes were able to be pulled from the OBDII connector. That is where they are getting that the BCM is bad. IDK a whole lot about cars....but I know there is no transponder chip in the key in a 2005. What do you think? I doubt they tried the re-learn with a programmer and reader

---------- Post added at 08:45 PM ---------- Previous post was at 08:40 PM ----------

Maybe i should call them and confirm the OBDII is not putting out DTC...but from my understanding...they said it dont
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post #8 of 16 (permalink) Old 09-12-2012, 06:57 PM
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My guess and very common on 05-06's is the "PCM" "TCM" ground as become corroded and is not letting the circuit complete it's electrical path. This would also stop them from retreiving OBDII codes from "ECM". Ask them if they checked G105 ground point.

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Drives 2007 Cashmere metalic Cobalt LS Sedan 2.2L auto 1G1AJ55F977161789


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post #9 of 16 (permalink) Old 09-12-2012, 07:24 PM Thread Starter
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Can u give me a location or picture of that ground point. I could check it with a multi-meter...the dealership is charging outrageous for this car. Its stuck there...I have a refrigerant leak coming from underneath the passenger floorboard and it has water all the way in the trunk. Could it have damaged any of the connectors from the harness???

---------- Post added at 09:24 PM ---------- Previous post was at 09:19 PM ----------

I found a picture from another post

2008 Cobalt LS Problem with Acceleration/lack of Power/hard Shifting

How do I clean it?
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post #10 of 16 (permalink) Old 09-12-2012, 07:41 PM
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Undo it and wire brush it and re-install.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2007 Cashmere metalic Cobalt LS Sedan 2.2L auto 1G1AJ55F977161789


Never drive faster than your guardian angel can fly
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