P1237
Fuel Pump Secondary Circuit Malfunction
2010-2014 Ford Mustang 3.7L V6
High SeverityPowertrain
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
P1233Fuel Pump Speed Primary Circuit MalfunctionP1233Fuel Pump Driver Module Disabled or OfflineP1233Throttle Valve Actuator JammedP1233Fuel Pump Driver Module Disabled or OfflineP1233Fuel Pump Driver Module Disabled or OfflineP1235Fuel Pump Control Out of RangeP1235Fuel Pump Control Out of RangeP1235Fuel Pump Control Out of Range
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1237 on Other Vehicles
Common Questions
What does code P1237 mean on a 2010-2014 Ford Mustang?
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 Mustang?
Common symptoms of P1237 include: Engine cranks but will not start, Engine stalls, Intermittent no-start, Loss of power.
What causes P1237 on a 2010-2014 Ford Mustang?
Common causes of P1237 include: Faulty FPDM, Corroded fuel pump connector, Failed fuel pump, Wiring damage, Blown fuel pump relay.