Fuel Pump Secondary Circuit Malfunction
2006-2010 Ford Explorer 4.6L V8 🇩🇪
Description
The fuel pump secondary circuit has a malfunction. The PCM has detected an issue with the return signal from the FPDM indicating the fuel pump is not operating as commanded.
Symptoms
- Engine cranks but will not start
- Engine stalls
- Intermittent no-start
- Loss of power
Common Causes
- Faulty FPDM
- Corroded fuel pump connector
- Failed fuel pump
- Wiring damage
- Blown fuel pump relay
Diagnostic Steps
- Check fuel pump relay
- Inspect FPDM and wiring
- Test fuel pump directly with power
- Check fuel pressure at rail
Repair Notes
Replace FPDM or fuel pump as needed. Repair corroded wiring.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
P1237 on Other Vehicles
Common Questions
What does code P1237 mean on a 2006-2010 Ford Explorer?
P1237 stands for "Fuel Pump Secondary Circuit Malfunction". The fuel pump secondary circuit has a malfunction. The PCM has detected an issue with the return signal from the FPDM indicating the fuel pump is not operating as commanded.
What are the symptoms of P1237 on a Ford Explorer?
Common symptoms of P1237 include: Engine cranks but will not start, Engine stalls, Intermittent no-start, Loss of power.
What causes P1237 on a 2006-2010 Ford Explorer?
Common causes of P1237 include: Faulty FPDM, Corroded fuel pump connector, Failed fuel pump, Wiring damage, Blown fuel pump relay.