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Check battery, alternator and starter.

IF these are all good, could be the Alt A or Alt B fused switches near the battery.

If not, could be security system lockout. Does it only happen when you have it locked with the keyless remote and open the door with your spare key and try to start? Try making sure you always use the keyless remote to unlock first. Does it only happen when its cold? Other threads suggest there are injector draws when it is below freezing.

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Q: Your hummer h2 wont start your battery is good and full charged?
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