P3655high severityPowertrain
GDI Fuel Metering Unit Control Stuck
on 2016 Cadillac ATS 2.5L I4 · RWD
What this code means
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.
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