P1629high severityPowertrain
Theft Deterrent Cranking Signal
on 2011 Chevrolet Express 6.0L V8 Vortec · RWD
What this code means
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.
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