P1631
Theft Deterrent Start Enable Signal Not Correct
2002-2007 Buick Rendezvous 3.5L V6
High SeverityPowertrain
Description
The PCM received a start enable signal from the theft deterrent system, but the signal is not the expected value or pattern.
Symptoms
- Vehicle will not start
- Security light flashing
- Engine cranks but does not fire
Common Causes
- Faulty key transponder
- Passlock sensor sending incorrect signal
- BCM internal fault
- Wiring issue corrupting signal
Diagnostic Steps
- Test theft deterrent signal at PCM
- Check key transponder
- Test Passlock sensor output
- Inspect wiring
- Attempt security relearn
Repair Notes
Perform security relearn. Replace Passlock sensor or BCM if signal remains incorrect.
Related Codes
P1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1626Theft Deterrent Fuel Enable Signal LostP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1629Theft Deterrent Cranking SignalP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel DisabledP1632Theft Deterrent System - Fuel Disabled
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1631 on Other Vehicles
Common Questions
What does code P1631 mean on a 2002-2007 Buick Rendezvous?
P1631 stands for "Theft Deterrent Start Enable Signal Not Correct". The PCM received a start enable signal from the theft deterrent system, but the signal is not the expected value or pattern.
What are the symptoms of P1631 on a Buick Rendezvous?
Common symptoms of P1631 include: Vehicle will not start, Security light flashing, Engine cranks but does not fire.
What causes P1631 on a 2002-2007 Buick Rendezvous?
Common causes of P1631 include: Faulty key transponder, Passlock sensor sending incorrect signal, BCM internal fault, Wiring issue corrupting signal.