"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: 148,403 (10,000–276,698)
8 model years affected: 1999, 2000, 2002, 2003, more2004, 2005, 2007, 2010
32 people reported this problem
17 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 Denali186,543
Anti theft system has it locked up won't crank but occasionally
2000 GMC Yukon Denali146,702
Security light flashing Starts and immediately dies Not yet fixed
2003 GMC Yukon Denali147,000
Occasionally starts but will immediately shut off . And will not run until you leave it alone for ten minutes. (I'm guessing the body control module resets) then it starts up and runs fine. Weather temp changes I noticed is a factor . Also if it doesn't start just leave the radio on and don't open the drivers door . Pull the key out of the ignition And then wait for the radio to automatically time out/turn off. Then it will start every time.
Cranks but no start
2000 GMC Yukon Denali148,000
That can't fix it yet after 3 stations and a dealership tried.
2000 GMC Yukon Denali110,000
It has happened 2 x in the past 9 months, it reset by putting key in door to open it instead of the key chain unlock. Security light goes on more frequently now.
2002 GMC Yukon Denali212,000
Starts at times and dies T
1999 GMC Yukon Denali276,698
Same as stated
1999 GMC Yukon Denali135,000
The engine cranks ok but will not start, security light is on, you cant lock the doors if the key is on, the headlights will not come on unless you push the emrg. brake down 2 clicks, the time delay on the radio and access. don't work, alarm does not work, several other issues, and NO GM dealers know anything about this, I say BS.
2002 Yukon Denali security light is blinking and won't start !! My battery has been bad for a while making me jump it for the last couple of months !! Could the battery have caused this ??
I have a 1999 GMC Savannah conversion van. If anyone has a fix for this please let me know!!! I have dealt with this for 3 years already!!!
will not start, been to the dealer twice they change the keys and replace the modeuler in the stearing wheel but no help.
There are about 20 things associated with this problem. All the way down to the headlights not coming on unless you push the emergency brake down 2 clicks.
05,GMC savanna,anti theft system want let me start
2005 GMC Yukon Denali130,000
Starts dies instantly. Only way to get started is to leave alone for 24 hours. Have had good luck so far by waiting for the security light to go out before starting.
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