P1230high severityPowertrain
Fuel Pump Control Unit Malfunction
on 2001 Subaru Impreza 2.5L H4 · AWD
What this code means
The PCM has detected a malfunction in the fuel pump control unit. The module that controls fuel pump operation is not functioning correctly, which can result in no fuel delivery or incorrect fuel pressure.
Symptoms
- Check Engine Light
- Engine cranks but will not start
- Engine stalls while driving
- Intermittent power loss
- No fuel pump prime sound on key-on
Common causes
- Faulty fuel pump control unit
- Wiring issue between PCM and fuel pump controller
- Fuel pump relay failure
- Corroded fuel pump connector
- PCM communication issue with fuel pump module
Diagnostic steps
- Listen for fuel pump prime when key is turned on
- Check fuel pump relay operation
- Test fuel pump control unit power and ground
- Inspect wiring between PCM and fuel pump controller
- Test fuel pressure at the rail
Repair notes
Replace the fuel pump control unit if it is not operating the fuel pump correctly.
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