P1641high severityPowertrain
Fuel Pump Primary Circuit Failure
on 2018 Lincoln MKX 2.7L EcoBoost V6 · AWD
What this code means
The fuel pump primary circuit has an electrical failure. The PCM cannot properly control the fuel pump relay or the circuit to the fuel pump.
Symptoms
- Check Engine Light
- Engine may not start
- Engine stalls
- Loss of fuel pressure
Common causes
- Faulty fuel pump relay
- Blown fuel pump fuse
- Wiring issue in fuel pump circuit
- Failed fuel pump
- Corroded connector
Diagnostic steps
- Check fuel pump fuse and relay
- Test for power at fuel pump connector
- Check fuel pump relay operation
- Test fuel pump directly with battery power
- Inspect wiring for damage
Repair notes
Replace fuel pump relay or fuse. Repair wiring. Replace fuel pump if failed.
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