Happened on my 97 GMC Sierra, weiredest thing. Spent 5 hours in a Diamond Shamrock Parking lot with a Locksmith. Finally we just drilled the lock, and replaced the ignition.
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North Texas Hummer Team Member
2003 Red H2 equipped with Tough Country Heavy Duty Armor Series Front End with Winch, Rear Bumper, Brush Guard, and Roof Rack.