HELP - truck will not start - tried everything - HELP PLEASE!!!

[HummerJim]

Saw something similar at an offroad event where the cables where crossed on the battery for a jump on an H2 and there was smoke. After that the H2 wouldn't start. At the end of the day we got him a new battery and helped him put it in, but it still wouldn't start and couldn't pull his key out with a new battery. He was also getting weird messages on his dashboard display and couldn't roll down the driver's side window.
He had it towed to the dealer and the wire that interacts from the ignition with the BCM was fried as was part of the Body Control Module. As it was expained to me by the owner later, the BCM has to interact with the PCM to start the H2. I think the tow guy owes you big bucks, but will probably never admit he screwed up! HumTech could explain it better and might know of something else.

[dna]

Personally I think my H2 is OK even with the crossing of the wires. Cause I have a 'battery guard' on the pos battery terminal which totally disconnects the pos to the vehicle if the batteryu is low or I hit a button to activate/close it. Fortunately I hit that button prior to leaving for gfolf, thus the effect was as if my pos cable was completely disconnected fromt he battery. Thus by this idiot driver crossing the wires, the only effect would be to the battery unless the ground still connected could have done something?

The odd thing though is that after I replaced the starter, it started instantly and I had no issues with the key. The starting and key thing started about 30 minutes later after trying it again??

Can someone please put their key into 'run' (to see the DIC lite up) and then turn key to start. Does the DIC dislay go out during the start position????

Thanks

[dna]

Well, I got it goin again and the cause was rather embarrasing. As stated earlier after I first replaced the starter it started and seemed to work perfect. At that point I reinstalled the steering column bottom cover and put away tools to find the H2 again not starting and the key stuck in the ignition.

After trying everything for hours, this morning I removed the new starter and did a bench test - it passed fine. At least this bench test gave me piece of mind that my original starter was dead as the same bench test on the original starter proved a bad starter motor.

So I re-installed the starter and still same issue. I then checked my fuses and found the ignition 40a fuse blown - I installed a new fuse and the truck started fine and the key is no longer getting stuck. I'm still puzzled what caused the fuse to blow, but I suspect as I was fiddling to get the steering column cover on perhaps I pushed on some wires causing a short??? Anyway I turned it off and on a few dozen times and drove around and all seems fine. Hopefully I do not end up with another blown fuse as that may suggest the idiot tow truck driver may have done some damage when he crossed the wires when jumping it.

BTW - where were all the helpful techs or advice?? Am I the only handy/techy H2 owner that does his own repairs or is not scared to get his hands dirty? I guess most of you take it to the shop for everything (probably even to get a oil change)

[porschett]

Sorry I couldn't help, but glad to see you got it figured out!

Yep, I take mine to a shop to get the oil changed. Spent way too many years getting dirty to worry about the extra $50.00

Besides, mine has NEVER seen a garage for ANYTHING other than an oil change.

[alsalsa]

Had same exact problem...mine turned out to be the security feature. Trying to tune it(superchips tuner) while the battery was not fully charged screwed it all up. After charging battery, removing certain fuses and tuning...it started up like nothing ever happened...reinstalled fuses and it. Went thru about 10 days of hell. Thanks to the superchips tech(an awesome young lady...got me thru it.

[HummerMann]

My Hummer dealer closed up shop last year, and the nearest GM dealer is 85 miles from the house, so I do whatever I can myself. If it's mechanical and I can do it with a wrench and tools I'll try it. When it comes to electrical stuff, I'm limited to installing offroad light bars and changing fuses.