No Power to Pcm - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 4 (permalink) Old 10-28-2016, 07:55 PM Thread Starter
Join Date: Oct 2016
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No Power to Pcm

2005 cobalt ss wirh 104k on her. It's ran fine. Started fine. I was out Wednesday running errands. Left my 2nd destination and car shut off at 40 mph or so. I coasted and tried to restart. Nothing happened. No click, nothing from starter. All acessories work tho

Took to mechanic. Obd2 port gets power but pcm isn't showing up on his scanner. There also is no power going to pcm fuse.

Checked g103 ground that grounds pcm. He said it's good. Does anyone have schematics? Know where pcm gets its power from so we can start somewhere?
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post #2 of 4 (permalink) Old 10-29-2016, 01:07 PM
Join Date: Apr 2016
Posts: 14
I hope I could help ,
I have had same type of problems with thing s not working on my cobalt,
start with the bcm fuse s under the hood on the top left side corner you have a 30 amp and a 40 amp ,fuse
all info is on the under side of the fuse box top were every thing is ,
even if it looks ok it may not be ,change it with another fuse and see what happens,
these 2 seem to control the car ,then start with the relays and check every fuse one by one ,it may have come up or is dirty around it ,then go from there .

hope this helps
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post #3 of 4 (permalink) Old 10-29-2016, 01:34 PM
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Location: Magnetic Hill, New-Brunswick
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Check and make sure your boost post is tight.
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post #4 of 4 (permalink) Old 10-30-2016, 11:25 AM Thread Starter
Join Date: Oct 2016
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I'm thinking it's the engine fuse box. All fuses and relays are good. Mechanic loosened it up and wiggled the wires and my dash did light up with some lights it is missing. Peoblem is, it's not at house for me to tinker with. But he said he's diving into it tomorrow. There were some wires rhat had the coating stripped off also. I'm hoping that's the problem
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cobalt ss , pcm , stalled

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