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P1631 Diagnostic Trouble Code Discussion for September 2005

Theft Deterrent - Start Enable Signal Not Correct

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Trouble Ticket Help Requests for DTC P1631
Help Request Posted
1999 GMC Sierra 1500 SL 5.3L No Start VIN: 1GTEK19T7X
P1631: Theft Deterrent - Start Enable Signal Not Correct. this truck has a intermittent no start security lockout.the computer is turning off the fuel injectors because it thinks the pass code is incorrect. the key lock cylinder is original.this is the 3rd GM vehichle to come to my shop with this pass code or pass lo...
September 10, 2005