H3 hummer battery died, now it won't start..........

[Murder after Midnight]

My battery died and my key got stuck in the ignition and won't come out, i have replaced the battery but it still won't start or release the ignition key, when i attempt to start, the car doesn't do anything but show a service engine light on the dash, and the door locks unlock other than that i have no other power, any ideas guys?

I already tried replacing the 125amp mega fuse and that did not help........

 

[poweraidon]

It may be the terminals. Have you tried replacing them?


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[alrock]

Maybe dumb question, but are you sure the new battery is good? I haven't heard of a similar issue before, I'm stumped.

 

[poweraidon]

Maybe after you replaced your new battery it got murdered after midnight


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[benlaud87]

Passlock issue?

Did you have the battery that you replaced tested or did you test it yourself with a multimeter?

 

[Airborne]

Try turning the steering wheel a little. That will usually unlock the ignition after it locks up like that. You might have to use a little bit of muscle but that usually does the trick.

 

[Mr_Rich]

My truck has done this before when I had parked it for a about a month previously. The battery had +12.x volts so I know that wasn't the issue. I verified I had good voltage at the battery terminals as well as the battery cables themselves. I switched around some of the power relays in the fuse box. Only thing I can come up with is that after a while I was able to start the truck again. I think the vehicle computer went into an anti-theft mode kind of like the GM radios do. After a couple of hours the truck started and I haven't had a problem since. I also called OnStar when this happened and they couldn't poll the vehicle or "talk" to the computer. Hard to say what happened. I'm guessing for the most part.