Theft Deterrent Fuel Enable Signal Lost
2002-2009 GMC Envoy 4.2L I6
Description
The PCM lost the fuel enable signal from the Body Control Module (BCM). The theft deterrent system sends a fuel enable signal to the PCM when it verifies the correct key is being used. Without this signal, the PCM will not pulse the fuel injectors. If the signal was lost after initial validation, the engine continues to run. If lost before validation, the engine will start and immediately stall.
Symptoms
- Vehicle will not start or starts then immediately stalls
- Check Engine Light
- Security light illuminated
- No-start condition
- Intermittent starting problems
Common Causes
- Faulty ignition key or worn key pellet
- Passlock sensor failure
- Body Control Module (BCM) malfunction
- Wiring issue on fuel enable circuit between BCM and PCM
- Ignition switch failure
- BCM replaced without performing relearn procedure
Diagnostic Steps
- Check security indicator light behavior
- Test fuel enable signal at PCM
- Inspect wiring between BCM and PCM
- Test Passlock sensor resistance
- Attempt security relearn procedure
- Check for BCM codes
Repair Notes
Perform 10-minute or 30-minute security relearn procedure. If intermittent, inspect wiring between BCM and PCM for breaks or chafing. Replace Passlock sensor or BCM if relearn fails.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P1626 on Other Vehicles
Common Questions
What does code P1626 mean on a 2002-2009 GMC Envoy?
P1626 stands for "Theft Deterrent Fuel Enable Signal Lost". The PCM lost the fuel enable signal from the Body Control Module (BCM). The theft deterrent system sends a fuel enable signal to the PCM when it verifies the correct key is being used. Without this signal, the PCM will not pulse the fuel injectors. If the signal was lost after initial validation, the engine continues to run. If lost before validation, the engine will start and immediately stall.
What are the symptoms of P1626 on a GMC Envoy?
Common symptoms of P1626 include: Vehicle will not start or starts then immediately stalls, Check Engine Light, Security light illuminated, No-start condition, Intermittent starting problems.
What causes P1626 on a 2002-2009 GMC Envoy?
Common causes of P1626 include: Faulty ignition key or worn key pellet, Passlock sensor failure, Body Control Module (BCM) malfunction, Wiring issue on fuel enable circuit between BCM and PCM, Ignition switch failure, BCM replaced without performing relearn procedure.