"No start" due to anti-theft system failure on GMC Yukon Denali

The anti-theft system may fail causing a no start condition, the security light may illuminate. Our technicians tell us that the ignition switch may need to be replaced to correct this fault.
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Average mileage: 166,814 (80,000–276,698)
5 model years affected: 1999, 2000, 2002, 2004, more2010
11 people reported this problem
3 people shared problem details
2002 GMC Yukon Denali169,000
At times will not start no crank or nothing,but some days it would start like everything is normal. So when it didn't start i would jerk the key ignition back and forth until it started.
2000 GMC Yukon Denali148,000
That can't fix it yet after 3 stations and a dealership tried.
1999 GMC Yukon Denali276,698
Same as stated
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