GDI Fuel Metering Unit Control Stuck
2004-2007 Buick Rainier 4.2L I6
Description
The high-pressure fuel pump metering unit that controls fuel volume entering the pump is stuck, causing incorrect fuel rail pressure.
Symptoms
- Check Engine Light
- Fuel pressure too high or too low
- Engine stalling
- Hard starting
- Rough running
- Fuel smell from engine
Common Causes
- Metering unit solenoid failure
- Contaminated fuel blocking metering valve
- Metering unit wiring short
- Mechanical debris in metering valve
- PCM driver circuit failure
Diagnostic Steps
- Monitor fuel metering command vs actual rail pressure
- Test metering unit solenoid resistance
- Inspect fuel quality
- Command metering unit through range with scan tool
- Check PCM driver output
Repair Notes
Replace high-pressure fuel pump metering unit. May require full pump replacement depending on design. Check fuel quality.
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
P3655 on Other Vehicles
Common Questions
What does code P3655 mean on a 2004-2007 Buick Rainier?
P3655 stands for "GDI Fuel Metering Unit Control Stuck". The high-pressure fuel pump metering unit that controls fuel volume entering the pump is stuck, causing incorrect fuel rail pressure.
What are the symptoms of P3655 on a Buick Rainier?
Common symptoms of P3655 include: Check Engine Light, Fuel pressure too high or too low, Engine stalling, Hard starting, Rough running, Fuel smell from engine.
What causes P3655 on a 2004-2007 Buick Rainier?
Common causes of P3655 include: Metering unit solenoid failure, Contaminated fuel blocking metering valve, Metering unit wiring short, Mechanical debris in metering valve, PCM driver circuit failure.