P3650high severityPowertrain
GDI High-Pressure Fuel Pump Performance
on 2014 Acura TSX 2.4L I4 · FWD
What this code means
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.
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