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P1631 Diagnostic Trouble Code Discussion for January 2010

Theft Deterrent - Start Enable Signal Not Correct

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Trouble Ticket Help Requests for DTC P1631
Help Request Posted
2004 Buick Rendezvous CXL 3.6L No Start VIN: 3G5DB03704
P1631: Theft Deterrent Fuel Enable Signal Not Correct. ... battery. It had headlights but they were dim. Battery voltage was 9 volts. I put my jump pack on it and attempted to start it. No crank. I noted security light on and went back to get a scan tool. Found all kinds of communication codes in all modules. Clea...
January 25, 2010
1999 Chevrolet C2500 6.5L No Start VIN: 1GCGC24F1X
P1631: Theft Deterrent - Start Enable Signal Not Correct. Good ol 6.5 no start. Let me start with the code.Has passlock code but fuel pump is active while cranking and present owner has never had a resistor key. I believe passlock has been bypassed. Customer complaint. Sometimes wouldn't start then this week will nev...
January 27, 2010