Theft Deterrent Cranking Signal
2013-2019 Cadillac XTS 3.6L V6
Description
The PCM is not receiving the expected cranking signal through the theft deterrent system during startup. The system cannot verify that the vehicle is being started with the correct key.
Symptoms
- Vehicle will not start
- Security light on
- Engine cranks but does not run
- Intermittent no-start
Common Causes
- Faulty ignition switch
- Passlock sensor issue
- BCM malfunction
- Wiring fault in cranking signal circuit
Diagnostic Steps
- Check security system status
- Test cranking signal at PCM
- Inspect ignition switch operation
- Test Passlock sensor
- Check BCM communication
Repair Notes
Test ignition switch and Passlock sensor. Perform security relearn if needed.
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
P1629 on Other Vehicles
Cadillac ATS
2013-2019 2.0L Turbo I4
Cadillac ATS
2013-2019 2.5L I4
Cadillac ATS-V
2016-2019 3.6L Twin-Turbo V6
Cadillac CT4
2020-2024 2.0L Turbo I4
Cadillac CT4
2020-2024 2.7L Turbo I4
Cadillac CT4-V
2020-2024 2.7L Turbo I4
Cadillac CT4-V Blackwing
2022-2024 3.6L Twin-Turbo V6
Cadillac CT5
2020-2024 2.0L Turbo I4
Common Questions
What does code P1629 mean on a 2013-2019 Cadillac XTS?
P1629 stands for "Theft Deterrent Cranking Signal". The PCM is not receiving the expected cranking signal through the theft deterrent system during startup. The system cannot verify that the vehicle is being started with the correct key.
What are the symptoms of P1629 on a Cadillac XTS?
Common symptoms of P1629 include: Vehicle will not start, Security light on, Engine cranks but does not run, Intermittent no-start.
What causes P1629 on a 2013-2019 Cadillac XTS?
Common causes of P1629 include: Faulty ignition switch, Passlock sensor issue, BCM malfunction, Wiring fault in cranking signal circuit.