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post #1 of 9 (permalink) Old 01-29-2013, 04:47 PM Thread Starter
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Bcm3 No Voltage

Sorry if this has been posted, but I didn't find anything searching. MY 06 Cobalt LS will not start, no dome light, and the radio doesn't come on.

I have checked fuses, and found the 30A BCM3 to be blown. I replaced it, but still nothing. Also, there is no voltage present at bcm3, and bcm2 shows 12v. Headlights come on, and DIC comes on also.

Thanks for any help!
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post #2 of 9 (permalink) Old 01-29-2013, 05:02 PM
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50 amp "BCM" fuse in the trunk.

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post #3 of 9 (permalink) Old 01-29-2013, 05:13 PM Thread Starter
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There's another fuse in the trunk?! This thing has fuses all over the place. I'm assuming it's near the battery?


edit: just went and looked, couldn't find it. But it's pretty dark, and I'm worn out. I'll keep looking, but if someone wants to chime in and tell me the location, it would be great!

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post #4 of 9 (permalink) Old 01-30-2013, 02:35 PM Thread Starter
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Ok, found fuse. It was bad, so I replaced it. The car cranks and runs, but I got a message saying "engine power reduced" and it barely runs. Any help, guys? Please?


edit: also getting p2101

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post #5 of 9 (permalink) Old 01-30-2013, 03:25 PM
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Okay, you will have to disconnect battery for 15 minutes or so and re-connect to reboot all CPUs. (ECM,TCM,ABSM,TDM,BCM and RCDLR if so equiped. These will re-syncronize.

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post #6 of 9 (permalink) Old 01-30-2013, 05:37 PM Thread Starter
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Tried the battery for about 20 minutes, no luck. Left it disconnected for over 2 hours, and it still is in "engine power reduced" mode. Is there some other fuse that could have blown as well, that's making it do this?
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post #7 of 9 (permalink) Old 01-30-2013, 05:56 PM
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Yes, underhood fuseblock ign1 voltage fuse. It supplies all sensors pretty much but won't stop engine from starting. Did your car get struck by lightning lol

---------- Post added at 09:56 PM ---------- Previous post was at 09:56 PM ----------

But check all fuses while you're there.

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post #8 of 9 (permalink) Old 01-30-2013, 06:07 PM Thread Starter
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Not lightning, lol, stupidity! I've been having problems with my blower motor, and have been jumping 12v to it from fuse block to get it to run. I replaced the HVAC cluster in the dash, but still no fan. So I went to hook up my temporary jumper, and attached it to the ground side. The wire got hot! And all the smoke came out! Apparently that's what blew the 50A BCM fuse.


edit: Oh, man I'm dumb! Last night while I was furiously checking fuses in the dark, I must have pulled the PCM/ECM to check and not replaced it. Discovered that just now while checking fuses again. Put one of the spares in, and *so far* it's running like a champ! Boy do I feel stupid!

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post #9 of 9 (permalink) Old 01-30-2013, 07:26 PM
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Glad you got it going.

---------- Post added at 11:26 PM ---------- Previous post was at 11:25 PM ----------

Now for your blower motor, both fuses are either side of the HVAC relay at the very top of the BCM fuse block.

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Last edited by Coby7; 01-30-2013 at 07:29 PM.
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