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P1631 Diagnostic Trouble Code Discussion for November 2006

Theft Deterrent - Start Enable Signal Not Correct

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Trouble Ticket Help Requests for DTC P1631
Help Request Posted
1999 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y9X
P1631: Theft Deterrent System - Start Enable Signal Not Current. Hey guys, I hope someone can help. This car came in running and I did alot of work to it now the theft deterent does not let me start the vehicle. It does crank, that tells me the key pellet is good. Also found passkey 55 in the IPC display data which is measu...
November 16, 2006
2000 GMC Sierra 1500 SL 5.3L No Start VIN: 1GTEK19T5X
P1631: Theft Deterrent - Start Enable Signal Not Correct. ... starting, he has an aftermarket command start which we unplugged. Still would not start intermittantly, so after reading the fix data base we replace the lock cylinder and passlock sensor, did a relearn and sent him on his way. 3 weeks later he is back, wi...
November 23, 2006