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post #1 of 12 (permalink) Old 03-23-2016, 07:42 PM Thread Starter
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2007 Chevy Cobalt LS Coupe

Please help anyone... I need help with my 07 Chevy Cobalt Ls Coupe. I just had a new engine with 120,000 miles on it along with a new fuel pump as well as a new timing chain and my car is constantly blowing the tcm/ecm fuses as soon as the battery is hooked up does anyone know what my problem could be and how much it will cost to fix... I was told it could be the wiring harness but I'm not sure because I know nothing about cars can someone please help me need to get this fixed because I need my car for work
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post #2 of 12 (permalink) Old 03-24-2016, 06:21 AM
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Harness must be pinched somewhere. I assume you mean the fuse under the hood and not the one in the BCM block.

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post #3 of 12 (permalink) Old 03-25-2016, 10:22 PM Thread Starter
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Can this problem be fixed? Because of this problem the tcm/ecm fuses constantly blowing my battery is constantly dying... any idea how much this should cost me to get fixed because I'm scared of taking it to an electrical auto shop to find out this problem is very expensive to fix but I need my car and it's my only transportation
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post #4 of 12 (permalink) Old 03-25-2016, 11:58 PM
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Who put the engine in, they probably made the mistake?

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post #5 of 12 (permalink) Old 03-27-2016, 10:09 PM Thread Starter
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A close friend he said all the grounds are good and my starter, Alternater, transmission are all fine.. just can't figure out why my car is constantly blowing the ecm/tcm fuses
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post #6 of 12 (permalink) Old 03-27-2016, 10:10 PM Thread Starter
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He also said when he unplugs everything the fuses still blows
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post #7 of 12 (permalink) Old 03-28-2016, 05:32 AM
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i don't see how unplugging everything could still blow the fuses unless there is a ground that is being fed power, if he crossed wires somehow and got a hot mixed with a ground that's the only thing i could think that would still make them blow when nothing is plugged in.

i'm confused still though, if its completely unplugged, it shouldn't have power or ground going to it so it shouldn't be blowing fuses. to blow a fuse it would either have to be too much power, or a short to ground, you cant have either if its unplugged.

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post #8 of 12 (permalink) Old 03-28-2016, 07:24 AM
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There are 3 ways of troubleshooting this. A quick and expensive way, a more expensive way and let somebody else do the work or the least expensive way.

1. Most expensive, let the dealer find the problem.
2. Expensive and quick, put in a large fuse and watch where the smoke comes from, that's where your problem is.
3. Least expensive but time consuming, remove burnt fuse and trace back the wiring to the problem. Since I still don't know if it's the underhood fuse or the BCM fuse your are talking about I can't tell the next step.

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post #9 of 12 (permalink) Old 03-31-2016, 07:48 PM Thread Starter
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How much will that cost because I'm really on a budget and really can't afford $1000 of dollars to fix this stupid car but I need it to get to work. My mom wants me to take it to an electrical auto shop but I have no idea if that is going to be expensive or not so I'm scared to even do that so I'm completely clueless about my car and think I should probably just probably junk it and save up for something else
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post #10 of 12 (permalink) Old 03-31-2016, 08:14 PM Thread Starter
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Quote:
Originally Posted by Maple_man View Post
i don't see how unplugging everything could still blow the fuses unless there is a ground that is being fed power, if he crossed wires somehow and got a hot mixed with a ground that's the only thing i could think that would still make them blow when nothing is plugged in.

i'm confused still though, if its completely unplugged, it shouldn't have power or ground going to it so it shouldn't be blowing fuses. to blow a fuse it would either have to be too much power, or a short to ground, you cant have either if its unplugged.
If he did crossed wires which I'm starting to think he could have gotten the wires mixed up how much do you think that will cost me to get it fixed so I can get my car back running again... everything comes on like it supposed too but since the fuses blew I no longer have power in my car
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