P3655high severityPowertrain
GDI Fuel Metering Unit Control Stuck
on 2010 Cadillac Escalade 6.2L V8 · 4WD
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.
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Bluetooth code reader (~$25)
Veepeak OBDCheck BLE →
Pairs with your phone — reads and clears codes, live data.
Serious DIY (~$100)
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
Shop-grade tablet (~$300+)
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1