GDI High-Pressure Fuel Pump Performance
2012-2016 Subaru Impreza 2.0L H4
Description
The gasoline direct injection (GDI) high-pressure fuel pump is not maintaining the commanded fuel rail pressure. GDI systems operate at 200-3000+ PSI.
Symptoms
- Check Engine Light
- Long crank time
- Rough idle
- Reduced power
- Engine stalling
- Fuel smell from engine bay
Common Causes
- Worn fuel pump cam follower
- Internal pump wear
- Low feed pressure from tank pump
- Fuel pump driver module fault
- Contaminated fuel
Diagnostic Steps
- Monitor fuel rail pressure vs commanded
- Check low-pressure feed pump output
- Inspect cam follower for wear
- Test fuel pump driver module
- Check fuel quality
Repair Notes
Replace high-pressure fuel pump and cam follower together. Always replace the follower to prevent repeat failure. Check camshaft lobe for wear.
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
P3650 on Other Vehicles
Common Questions
What does code P3650 mean on a 2012-2016 Subaru Impreza?
P3650 stands for "GDI High-Pressure Fuel Pump Performance". The gasoline direct injection (GDI) high-pressure fuel pump is not maintaining the commanded fuel rail pressure. GDI systems operate at 200-3000+ PSI.
What are the symptoms of P3650 on a Subaru Impreza?
Common symptoms of P3650 include: Check Engine Light, Long crank time, Rough idle, Reduced power, Engine stalling, Fuel smell from engine bay.
What causes P3650 on a 2012-2016 Subaru Impreza?
Common causes of P3650 include: Worn fuel pump cam follower, Internal pump wear, Low feed pressure from tank pump, Fuel pump driver module fault, Contaminated fuel.