P1631high severityPowertrain
Theft Deterrent Start Enable Signal Not Correct
on 2017 Buick Enclave 3.6L V6 · AWD
What this code means
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1