what do i do if i cant turn key to start it and security lite is flashing? on 2002 GMC Yukon XL 1500

i got in it turned key and it sounded like battery was low it clicked...then when i turned key to stop it i got out to open hood n tried to turn key again and key would not turn and i was jump starting it and security lite came on n key would not turn?

by in Silver City, NM on April 03, 2013
1 answer
ANSWER by on April 04, 2013
Wrong key used the second time or steering wheel needs to be rocked back an forth to take pressure off key cylinder while turning it.

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