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P1631 Diagnostic Trouble Code Discussion for December 2007

Theft Deterrent - Start Enable Signal Not Correct

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Trouble Ticket Help Requests for DTC P1631
Help Request Posted
1999 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R4X
P1631: Theft Deterrent - Start Enable Signal Not Correct. ... was driven to shop. started and drove normally on road test. security light was not on. after scanning pcm and finding p1631 i called driver to ask about security light. he said it comes on "sometimes". I tested battery and found it was bad. replac...
December 31, 2007