GDI Fuel Rail Pressure Too Low During Cranking
2002-2009 GMC Envoy 4.2L I6 🇨🇦
Description
The fuel rail pressure in the GDI system does not reach the minimum required pressure during engine cranking.
Symptoms
- Extended cranking time
- No start condition
- Rough start then smooths out
- Fuel rail pressure reads low on scan tool
- May start after multiple attempts
Common Causes
- Worn high-pressure fuel pump
- Fuel injector leaking back
- Rail pressure sensor error
- Low-pressure supply pump weak
- Fuel check valve leaking
Diagnostic Steps
- Monitor rail pressure during cranking
- Check low-pressure fuel supply
- Test fuel injector leak-back
- Inspect high-pressure pump cam follower
- Measure cranking RPM
Repair Notes
{"Replace high-pressure fuel pump. Test fuel injectors for leak-back. Ensure low-pressure supply exceeds minimum feed pressure."}
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
P3651 on Other Vehicles
Common Questions
What does code P3651 mean on a 2002-2009 GMC Envoy?
P3651 stands for "GDI Fuel Rail Pressure Too Low During Cranking". The fuel rail pressure in the GDI system does not reach the minimum required pressure during engine cranking.
What are the symptoms of P3651 on a GMC Envoy?
Common symptoms of P3651 include: Extended cranking time, No start condition, Rough start then smooths out, Fuel rail pressure reads low on scan tool, May start after multiple attempts.
What causes P3651 on a 2002-2009 GMC Envoy?
Common causes of P3651 include: Worn high-pressure fuel pump, Fuel injector leaking back, Rail pressure sensor error, Low-pressure supply pump weak, Fuel check valve leaking.