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Tryed to bypass vats yesterday went to crank car would not crank so i looked for codes and came up with these [Theft Deterrent start enable signal not correct]-[1552-keep alive memory error]-2750 pass key data communicationtal failure]-and [1558 BCM EPROMchecksum error.
Hope someone can HELP THANKS.:thepan:
 

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Cadillac Technician
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Sound like a VATS ign lock cylinder.
Does it say "starting disabled" on the DIC?
The wires inside the column have a tendency to break due to years of use.
You have to replace the cylinder, and get 2 new keys made to match the cylinder (if you want 2 keys).
Your old key won't work anymore, but make sure they have it when you get the work done, they have to match the pellet code.
 
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