Theft Deterrent Start Enable Signal Not Correct
2014-2014 Cadillac SRX 3.0L V6
The 2014 Cadillac SRX is equipped with a 3.0L V6 engine. Below you'll find detailed p1631 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
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
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 2014-2014 Cadillac SRX?
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 Cadillac SRX?
Common symptoms of P1631 include: Vehicle will not start, Security light flashing, Engine cranks but does not fire.
What causes P1631 on a 2014-2014 Cadillac SRX?
Common causes of P1631 include: Faulty key transponder, Passlock sensor sending incorrect signal, BCM internal fault, Wiring issue corrupting signal.
Last updated: March 2026